// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/preloading/prefetch/prefetch_service.h"

#include "base/containers/cxx20_erase.h"
#include "base/notreached.h"
#include "base/ranges/algorithm.h"
#include "base/run_loop.h"
#include "base/strings/string_util.h"
#include "base/test/bind.h"
#include "base/test/metrics/histogram_tester.h"
#include "base/test/mock_callback.h"
#include "base/test/scoped_feature_list.h"
#include "base/test/test_future.h"
#include "base/time/time.h"
#include "base/timer/elapsed_timer.h"
#include "components/ukm/test_ukm_recorder.h"
#include "content/browser/preloading/prefetch/prefetch_container.h"
#include "content/browser/preloading/prefetch/prefetch_document_manager.h"
#include "content/browser/preloading/prefetch/prefetch_features.h"
#include "content/browser/preloading/prefetch/prefetch_match_resolver.h"
#include "content/browser/preloading/prefetch/prefetch_params.h"
#include "content/browser/preloading/prefetch/prefetch_status.h"
#include "content/browser/preloading/preloading.h"
#include "content/browser/preloading/preloading_attempt_impl.h"
#include "content/browser/preloading/preloading_config.h"
#include "content/browser/preloading/preloading_data_impl.h"
#include "content/common/features.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/frame_accept_header.h"
#include "content/public/browser/prefetch_service_delegate.h"
#include "content/public/browser/preloading.h"
#include "content/public/browser/storage_partition.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_features.h"
#include "content/public/test/fake_service_worker_context.h"
#include "content/public/test/mock_navigation_handle.h"
#include "content/public/test/preloading_test_util.h"
#include "content/public/test/test_browser_context.h"
#include "content/public/test/test_renderer_host.h"
#include "content/test/test_content_browser_client.h"
#include "net/base/load_flags.h"
#include "net/base/proxy_server.h"
#include "net/base/request_priority.h"
#include "services/metrics/public/cpp/metrics_utils.h"
#include "services/metrics/public/cpp/ukm_builders.h"
#include "services/metrics/public/cpp/ukm_source_id.h"
#include "services/network/public/cpp/features.h"
#include "services/network/public/cpp/parsed_headers.h"
#include "services/network/public/cpp/weak_wrapper_shared_url_loader_factory.h"
#include "services/network/public/mojom/cookie_manager.mojom.h"
#include "services/network/public/mojom/network_context.mojom.h"
#include "services/network/public/mojom/proxy_lookup_client.mojom.h"
#include "services/network/test/test_network_context.h"
#include "services/network/test/test_url_loader_factory.h"
#include "services/network/test/test_utils.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/public/common/web_preferences/web_preferences.h"
#include "url/gurl.h"

namespace content {
namespace {

const char kPrefetchProxyAddress[] = "https://testprefetchproxy.com";

const char kApiKey[] = "APIKEY";

const int kTotalTimeDuration = 4321;

const int kConnectTimeDuration = 123;

const int kHeaderLatency = 456;

const char kHTMLMimeType[] = "text/html";

const char kHTMLBody[] = R"(
      <!DOCTYPE HTML>
      <html>
        <head></head>
        <body></body>
      </html>)";

PreloadingEligibility ToPreloadingEligibility(PrefetchStatus status) {
  if (status == PrefetchStatus::kPrefetchNotEligibleDataSaverEnabled) {
    return PreloadingEligibility::kDataSaverEnabled;
  }
  return static_cast<PreloadingEligibility>(
      static_cast<int>(status) +
      static_cast<int>(PreloadingEligibility::kPreloadingEligibilityCommonEnd));
}

PreloadingFailureReason ToPreloadingFailureReason(PrefetchStatus status) {
  return static_cast<PreloadingFailureReason>(
      static_cast<int>(status) +
      static_cast<int>(
          PreloadingFailureReason::kPreloadingFailureReasonCommonEnd));
}

class MockPrefetchServiceDelegate : public PrefetchServiceDelegate {
 public:
  explicit MockPrefetchServiceDelegate(int num_on_prefetch_likely_calls = 1) {
    // Sets default behavior for the delegate.
    ON_CALL(*this, GetDefaultPrefetchProxyHost)
        .WillByDefault(testing::Return(GURL(kPrefetchProxyAddress)));
    ON_CALL(*this, GetAPIKey).WillByDefault(testing::Return(kApiKey));
    ON_CALL(*this, IsOriginOutsideRetryAfterWindow(testing::_))
        .WillByDefault(testing::Return(true));
    ON_CALL(*this, DisableDecoysBasedOnUserSettings)
        .WillByDefault(testing::Return(false));
    ON_CALL(*this, IsSomePreloadingEnabled)
        .WillByDefault(testing::Return(PreloadingEligibility::kEligible));
    ON_CALL(*this, IsExtendedPreloadingEnabled)
        .WillByDefault(testing::Return(false));
    ON_CALL(*this, IsPreloadingPrefEnabled)
        .WillByDefault(testing::Return(true));
    ON_CALL(*this, IsDataSaverEnabled).WillByDefault(testing::Return(false));
    ON_CALL(*this, IsBatterySaverEnabled).WillByDefault(testing::Return(false));
    ON_CALL(*this, IsDomainInPrefetchAllowList(testing::_))
        .WillByDefault(testing::Return(true));

    EXPECT_CALL(*this, OnPrefetchLikely(testing::_))
        .Times(num_on_prefetch_likely_calls);
  }

  ~MockPrefetchServiceDelegate() override = default;

  MockPrefetchServiceDelegate(const MockPrefetchServiceDelegate&) = delete;
  MockPrefetchServiceDelegate& operator=(const MockPrefetchServiceDelegate) =
      delete;

  // PrefetchServiceDelegate.
  MOCK_METHOD(std::string, GetMajorVersionNumber, (), (override));
  MOCK_METHOD(std::string, GetAcceptLanguageHeader, (), (override));
  MOCK_METHOD(GURL, GetDefaultPrefetchProxyHost, (), (override));
  MOCK_METHOD(std::string, GetAPIKey, (), (override));
  MOCK_METHOD(GURL, GetDefaultDNSCanaryCheckURL, (), (override));
  MOCK_METHOD(GURL, GetDefaultTLSCanaryCheckURL, (), (override));
  MOCK_METHOD(void,
              ReportOriginRetryAfter,
              (const GURL&, base::TimeDelta),
              (override));
  MOCK_METHOD(bool, IsOriginOutsideRetryAfterWindow, (const GURL&), (override));
  MOCK_METHOD(void, ClearData, (), (override));
  MOCK_METHOD(bool, DisableDecoysBasedOnUserSettings, (), (override));
  MOCK_METHOD(PreloadingEligibility, IsSomePreloadingEnabled, (), (override));
  MOCK_METHOD(bool, IsExtendedPreloadingEnabled, (), (override));
  MOCK_METHOD(bool, IsPreloadingPrefEnabled, (), (override));
  MOCK_METHOD(bool, IsDataSaverEnabled, (), (override));
  MOCK_METHOD(bool, IsBatterySaverEnabled, (), (override));
  MOCK_METHOD(bool, IsDomainInPrefetchAllowList, (const GURL&), (override));
  MOCK_METHOD(void, OnPrefetchLikely, (WebContents*), (override));
};

class ScopedPrefetchServiceContentBrowserClient
    : public TestContentBrowserClient {
 public:
  explicit ScopedPrefetchServiceContentBrowserClient(
      std::unique_ptr<MockPrefetchServiceDelegate>
          mock_prefetch_service_delegate)
      : mock_prefetch_service_delegate_(
            std::move(mock_prefetch_service_delegate)) {
    old_browser_client_ = SetBrowserClientForTesting(this);
    off_the_record_context_ = std::make_unique<TestBrowserContext>();
    off_the_record_context_->set_is_off_the_record(true);
  }

  ~ScopedPrefetchServiceContentBrowserClient() override {
    EXPECT_EQ(this, SetBrowserClientForTesting(old_browser_client_));
  }

  // ContentBrowserClient.
  std::unique_ptr<PrefetchServiceDelegate> CreatePrefetchServiceDelegate(
      BrowserContext*) override {
    return std::move(mock_prefetch_service_delegate_);
  }

  void UseOffTheRecordContextForStoragePartition(bool use) {
    use_off_the_record_context_for_storage_paritition_ = use;
  }
  // `BrowserContext::GetStoragePartitionForUrl` eventually calls this method
  // on the browser client to get the config. Overwrite it so the prefetch can
  // be rejected due to a non-default storage partition.
  StoragePartitionConfig GetStoragePartitionConfigForSite(
      BrowserContext* browser_context,
      const GURL& site) override {
    if (use_off_the_record_context_for_storage_paritition_) {
      return StoragePartitionConfig::CreateDefault(
          off_the_record_context_.get());
    }
    return TestContentBrowserClient::GetStoragePartitionConfigForSite(
        browser_context, site);
  }

 private:
  raw_ptr<ContentBrowserClient> old_browser_client_;
  std::unique_ptr<MockPrefetchServiceDelegate> mock_prefetch_service_delegate_;
  // This browser context is used to generate a different storage partition if
  // `use_off_the_record_context_for_storage_paritition_` is set to true.
  std::unique_ptr<TestBrowserContext> off_the_record_context_;
  bool use_off_the_record_context_for_storage_paritition_{false};
};

// This is only used to test the proxy lookup.
class TestNetworkContext : public network::TestNetworkContext {
 public:
  explicit TestNetworkContext(absl::optional<net::ProxyInfo> proxy_info)
      : proxy_info_(proxy_info) {}

  void LookUpProxyForURL(
      const GURL& url,
      const net::NetworkAnonymizationKey& network_anonymization_key,
      mojo::PendingRemote<network::mojom::ProxyLookupClient>
          pending_proxy_lookup_client) override {
    mojo::Remote<network::mojom::ProxyLookupClient> proxy_lookup_client(
        std::move(pending_proxy_lookup_client));
    proxy_lookup_client->OnProxyLookupComplete(net::OK, proxy_info_);
  }

 private:
  absl::optional<net::ProxyInfo> proxy_info_;
};

net::RequestPriority ExpectedPriorityForEagerness(
    blink::mojom::SpeculationEagerness eagerness) {
  switch (eagerness) {
    case blink::mojom::SpeculationEagerness::kConservative:
      return net::RequestPriority::MEDIUM;
    case blink::mojom::SpeculationEagerness::kModerate:
      return net::RequestPriority::LOW;
    default:
      return net::RequestPriority::IDLE;
  }
}

class PrefetchFakeServiceWorkerContext : public FakeServiceWorkerContext {
 public:
  explicit PrefetchFakeServiceWorkerContext(
      BrowserTaskEnvironment& task_environment)
      : task_environment_(task_environment) {}

  PrefetchFakeServiceWorkerContext(const PrefetchFakeServiceWorkerContext&) =
      delete;
  PrefetchFakeServiceWorkerContext& operator=(
      const PrefetchFakeServiceWorkerContext&) = delete;

  ~PrefetchFakeServiceWorkerContext() override = default;

  void CheckHasServiceWorker(const GURL& url,
                             const blink::StorageKey& key,
                             CheckHasServiceWorkerCallback callback) override {
    if (long_service_worker_check_duration_.is_positive()) {
      task_environment()->FastForwardBy(long_service_worker_check_duration_);
    }
    if (!MaybeHasRegistrationForStorageKey(key)) {
      std::move(callback).Run(ServiceWorkerCapability::NO_SERVICE_WORKER);
      return;
    }
    auto service_worker_info = base::ranges::find_if(
        service_worker_scopes_,
        [url](const std::pair<GURL, ServiceWorkerCapability>&
                  service_worker_info) {
          return base::StartsWith(url.spec(), service_worker_info.first.spec());
        });
    if (service_worker_info != service_worker_scopes_.end()) {
      std::move(callback).Run(service_worker_info->second);
      return;
    }
    std::move(callback).Run(ServiceWorkerCapability::NO_SERVICE_WORKER);
  }

  void AddServiceWorkerScope(const GURL& scope,
                             ServiceWorkerCapability capability) {
    ASSERT_NE(capability, ServiceWorkerCapability::NO_SERVICE_WORKER);
    service_worker_scopes_[scope] = capability;
  }

  void SetServiceWorkerCheckDuration(base::TimeDelta duration) {
    long_service_worker_check_duration_ = duration;
  }

 private:
  BrowserTaskEnvironment* task_environment() {
    return &task_environment_.get();
  }

  base::TimeDelta long_service_worker_check_duration_;
  std::map<GURL, ServiceWorkerCapability> service_worker_scopes_;
  const base::raw_ref<BrowserTaskEnvironment> task_environment_;
};

class PrefetchServiceTest : public RenderViewHostTestHarness {
 public:
  const int kServiceWorkerCheckDuration = 1000;
  PrefetchServiceTest()
      : RenderViewHostTestHarness(
            base::test::TaskEnvironment::TimeSource::MOCK_TIME),
        test_url_loader_factory_(/*observe_loader_requests=*/true),
        test_shared_url_loader_factory_(
            base::MakeRefCounted<network::WeakWrapperSharedURLLoaderFactory>(
                &test_url_loader_factory_)) {
    service_worker_context_ =
        std::make_unique<PrefetchFakeServiceWorkerContext>(*task_environment());
  }

  void SetUp() override {
    RenderViewHostTestHarness::SetUp();

    browser_context()
        ->GetDefaultStoragePartition()
        ->GetNetworkContext()
        ->GetCookieManager(cookie_manager_.BindNewPipeAndPassReceiver());

    InitScopedFeatureList();

    PrefetchService::SetURLLoaderFactoryForTesting(
        test_shared_url_loader_factory_.get());

    PrefetchService::SetHostNonUniqueFilterForTesting(
        [](base::StringPiece) { return false; });
    PrefetchService::SetServiceWorkerContextForTesting(
        service_worker_context_.get());

    test_ukm_recorder_ = std::make_unique<ukm::TestAutoSetUkmRecorder>();
    attempt_entry_builder_ =
        std::make_unique<test::PreloadingAttemptUkmEntryBuilder>(
            content_preloading_predictor::kSpeculationRules);

    scoped_test_timer_ =
        std::make_unique<base::ScopedMockElapsedTimersForTest>();
  }

  void TearDown() override {
    if (PrefetchDocumentManager::GetForCurrentDocument(main_rfh()))
      PrefetchDocumentManager::DeleteForCurrentDocument(main_rfh());
    PrefetchDocumentManager::SetPrefetchServiceForTesting(nullptr);
    mock_navigation_handle_.reset();
    prefetch_service_.reset();
    PrefetchService::SetURLLoaderFactoryForTesting(nullptr);
    PrefetchService::SetHostNonUniqueFilterForTesting(nullptr);
    PrefetchService::SetServiceWorkerContextForTesting(nullptr);
    PrefetchService::SetURLLoaderFactoryForTesting(nullptr);
    test_content_browser_client_.reset();
    scoped_feature_list_.Reset();
    request_handler_keep_alive_.clear();
    service_worker_context_.reset();
    RenderViewHostTestHarness::TearDown();
  }

  virtual void InitScopedFeatureList() {
    scoped_feature_list_.InitWithFeaturesAndParameters(
        {{features::kPrefetchUseContentRefactor,
          {{"ineligible_decoy_request_probability", "0"},
           {"prefetch_container_lifetime_s", "-1"}}}},
        {network::features::kPrefetchNoVarySearch});
  }

  void MakePrefetchService(std::unique_ptr<MockPrefetchServiceDelegate>
                               mock_prefetch_service_delegate) {
    test_content_browser_client_ =
        std::make_unique<ScopedPrefetchServiceContentBrowserClient>(
            std::move(mock_prefetch_service_delegate));

    prefetch_service_ = std::make_unique<PrefetchService>(browser_context());
    PrefetchDocumentManager::SetPrefetchServiceForTesting(
        prefetch_service_.get());
  }

  // Creates a prefetch request for |url| on the current main frame.
  void MakePrefetchOnMainFrame(
      const GURL& prefetch_url,
      const PrefetchType& prefetch_type,
      const blink::mojom::Referrer& referrer = blink::mojom::Referrer(),
      bool enable_no_vary_search_header = false,
      network::mojom::NoVarySearchPtr&& no_vary_search_hint =
          network::mojom::NoVarySearchPtr()) {
    PrefetchDocumentManager* prefetch_document_manager =
        PrefetchDocumentManager::GetOrCreateForCurrentDocument(main_rfh());
    if (enable_no_vary_search_header)
      prefetch_document_manager->EnableNoVarySearchSupport();

    prefetch_document_manager->PrefetchUrl(
        prefetch_url, prefetch_type, referrer, no_vary_search_hint,
        blink::mojom::SpeculationInjectionWorld::kNone, nullptr);
  }

  int RequestCount() { return test_url_loader_factory_.NumPending(); }

  void ClearCompletedRequests() {
    std::vector<network::TestURLLoaderFactory::PendingRequest>* requests =
        test_url_loader_factory_.pending_requests();

    base::EraseIf(
        *requests,
        [](const network::TestURLLoaderFactory::PendingRequest& request) {
          return !request.client.is_connected();
        });
  }

  struct VerifyCommonRequestStateOptions {
    bool use_prefetch_proxy = false;
    net::RequestPriority expected_priority = net::RequestPriority::IDLE;
  };

  void VerifyCommonRequestState(const GURL& url) {
    VerifyCommonRequestState(url, {});
  }

  void VerifyCommonRequestState(
      const GURL& url,
      const VerifyCommonRequestStateOptions& options) {
    SCOPED_TRACE(url.spec());
    EXPECT_EQ(RequestCount(), 1);

    network::TestURLLoaderFactory::PendingRequest* request =
        test_url_loader_factory_.GetPendingRequest(0);

    VerifyCommonRequestState(url, options, request);
  }

  void VerifyCommonRequestStateByUrl(const GURL& url) {
    VerifyCommonRequestStateByUrl(url, {});
  }

  void VerifyCommonRequestStateByUrl(
      const GURL& url,
      const VerifyCommonRequestStateOptions& options) {
    SCOPED_TRACE(url.spec());
    auto* pending_request = GetPendingRequestByUrl(url);
    ASSERT_TRUE(pending_request);

    VerifyCommonRequestState(url, options, pending_request);
  }

  void VerifyIsolationInfo(const net::IsolationInfo& isolation_info) {
    EXPECT_FALSE(isolation_info.IsEmpty());
    EXPECT_TRUE(isolation_info.network_isolation_key().IsFullyPopulated());
    EXPECT_FALSE(isolation_info.network_isolation_key().IsTransient());
    EXPECT_FALSE(isolation_info.site_for_cookies().IsNull());
  }

  network::mojom::URLResponseHeadPtr CreateURLResponseHeadForPrefetch(
      net::HttpStatusCode http_status,
      const std::string mime_type,
      bool use_prefetch_proxy,
      const std::vector<std::pair<std::string, std::string>>& headers,
      const GURL& request_url) {
    auto head = network::CreateURLResponseHead(http_status);

    head->response_time = base::Time::Now();
    head->request_time =
        head->response_time - base::Milliseconds(kTotalTimeDuration);

    head->load_timing.connect_timing.connect_end =
        base::TimeTicks::Now() - base::Minutes(2);
    head->load_timing.connect_timing.connect_start =
        head->load_timing.connect_timing.connect_end -
        base::Milliseconds(kConnectTimeDuration);

    head->load_timing.receive_headers_end = base::TimeTicks::Now();
    head->load_timing.request_start = head->load_timing.receive_headers_end -
                                      base::Milliseconds(kHeaderLatency);

    head->proxy_server =
        use_prefetch_proxy
            ? net::ProxyServer::FromSchemeHostAndPort(
                  net::ProxyServer::Scheme::SCHEME_HTTPS,
                  PrefetchProxyHost(GURL(kPrefetchProxyAddress)).spec(),
                  absl::nullopt)
            : net::ProxyServer::Direct();

    head->mime_type = mime_type;
    for (const auto& header : headers) {
      head->headers->AddHeader(header.first, header.second);
    }
    if (!head->parsed_headers) {
      head->parsed_headers =
          network::PopulateParsedHeaders(head->headers.get(), request_url);
    }

    return head;
  }

  void MakeSingleRedirectAndWait(
      const net::RedirectInfo& redirect_info,
      network::mojom::URLResponseHeadPtr redirect_head) {
    network::TestURLLoaderFactory::PendingRequest* request =
        test_url_loader_factory_.GetPendingRequest(0);
    ASSERT_TRUE(request);
    ASSERT_TRUE(request->client);

    request->client->OnReceiveRedirect(redirect_info, redirect_head.Clone());
    task_environment()->RunUntilIdle();
  }

  void VerifyFollowRedirectParams(size_t expected_follow_redirect_params_size) {
    network::TestURLLoaderFactory::PendingRequest* request =
        test_url_loader_factory_.GetPendingRequest(0);
    ASSERT_TRUE(request);
    ASSERT_TRUE(request->test_url_loader);

    const auto& follow_redirect_params =
        request->test_url_loader->follow_redirect_params();
    EXPECT_EQ(follow_redirect_params.size(),
              expected_follow_redirect_params_size);

    for (const auto& follow_redirect_param : follow_redirect_params) {
      EXPECT_EQ(follow_redirect_param.removed_headers.size(), 0U);
      EXPECT_TRUE(follow_redirect_param.modified_headers.IsEmpty());
      EXPECT_TRUE(follow_redirect_param.modified_cors_exempt_headers.IsEmpty());
      EXPECT_FALSE(follow_redirect_param.new_url);
    }
  }

  void MakeResponseAndWait(
      net::HttpStatusCode http_status,
      net::Error net_error,
      const std::string mime_type,
      bool use_prefetch_proxy,
      std::vector<std::pair<std::string, std::string>> headers,
      const std::string& body) {
    network::TestURLLoaderFactory::PendingRequest* request =
        test_url_loader_factory_.GetPendingRequest(0);
    ASSERT_TRUE(request);

    auto head = CreateURLResponseHeadForPrefetch(http_status, mime_type,
                                                 use_prefetch_proxy, headers,
                                                 request->request.url);
    network::URLLoaderCompletionStatus status(net_error);
    test_url_loader_factory_.AddResponse(request->request.url, std::move(head),
                                         body, status);
    task_environment()->RunUntilIdle();
    // Clear responses in the network service so we can inspect the next request
    // that comes in before it is responded to.
    test_url_loader_factory_.ClearResponses();
  }

  void SendHeadOfResponseAndWait(
      net::HttpStatusCode http_status,
      const std::string mime_type,
      bool use_prefetch_proxy,
      std::vector<std::pair<std::string, std::string>> headers,
      uint32_t expected_total_body_size) {
    network::TestURLLoaderFactory::PendingRequest* request =
        test_url_loader_factory_.GetPendingRequest(0);
    ASSERT_FALSE(producer_handle_for_gurl_.count(request->request.url));
    ASSERT_TRUE(request);
    SendHeadOfResponseAndWait(http_status, mime_type, use_prefetch_proxy,
                              headers, expected_total_body_size, request);
    ASSERT_TRUE(producer_handle_for_gurl_.count(request->request.url));
  }

  void SendHeadOfResponseForUrlAndWait(
      const GURL& request_url,
      net::HttpStatusCode http_status,
      const std::string mime_type,
      bool use_prefetch_proxy,
      std::vector<std::pair<std::string, std::string>> headers,
      uint32_t expected_total_body_size) {
    auto* request = GetPendingRequestByUrl(request_url);

    ASSERT_TRUE(request);
    ASSERT_TRUE(request->client);
    ASSERT_FALSE(producer_handle_for_gurl_.count(request->request.url));
    SendHeadOfResponseAndWait(http_status, mime_type, use_prefetch_proxy,
                              headers, expected_total_body_size, request);
    ASSERT_TRUE(producer_handle_for_gurl_.count(request->request.url));
  }

  void SendBodyContentOfResponseAndWait(const std::string& body) {
    network::TestURLLoaderFactory::PendingRequest* request =
        test_url_loader_factory_.GetPendingRequest(0);
    ASSERT_TRUE(request);
    SendBodyContentOfResponseAndWait(body, request);
  }

  void SendBodyContentOfResponseForUrlAndWait(const GURL& url,
                                              const std::string& body) {
    auto* request = GetPendingRequestByUrl(url);
    ASSERT_TRUE(request);
    SendBodyContentOfResponseAndWait(body, request);
  }

  void CompleteResponseAndWait(net::Error net_error,
                               uint32_t expected_total_body_size) {
    network::TestURLLoaderFactory::PendingRequest* request =
        test_url_loader_factory_.GetPendingRequest(0);
    ASSERT_TRUE(request);
    CompleteResponseAndWait(net_error, expected_total_body_size, request);
  }

  void CompleteResponseForUrlAndWait(const GURL& url,
                                     net::Error net_error,
                                     uint32_t expected_total_body_size) {
    auto* request = GetPendingRequestByUrl(url);
    ASSERT_TRUE(request);
    CompleteResponseAndWait(net_error, expected_total_body_size, request);
  }

  bool SetCookie(const GURL& url, const std::string& value) {
    std::unique_ptr<net::CanonicalCookie> cookie(net::CanonicalCookie::Create(
        url, value, base::Time::Now(), /*server_time=*/absl::nullopt,
        /*cookie_partition_key=*/absl::nullopt));

    EXPECT_TRUE(cookie.get());

    bool result = false;
    base::RunLoop run_loop;

    net::CookieOptions options;
    options.set_include_httponly();
    options.set_same_site_cookie_context(
        net::CookieOptions::SameSiteCookieContext::MakeInclusive());

    cookie_manager_->SetCanonicalCookie(
        *cookie.get(), url, options,
        base::BindOnce(
            [](bool* result, base::RunLoop* run_loop,
               net::CookieAccessResult set_cookie_access_result) {
              *result = set_cookie_access_result.status.IsInclude();
              run_loop->Quit();
            },
            &result, &run_loop));
    run_loop.Run();
    return result;
  }

  void Navigate(const GURL& url,
                const absl::optional<blink::LocalFrameToken>&
                    initiator_local_frame_token) {
    mock_navigation_handle_ =
        std::make_unique<testing::NiceMock<MockNavigationHandle>>(
            web_contents());
    mock_navigation_handle_->set_url(url);
    mock_navigation_handle_->set_initiator_frame_token(
        base::OptionalToPtr(initiator_local_frame_token));

    PrefetchDocumentManager* prefetch_document_manager =
        PrefetchDocumentManager::GetOrCreateForCurrentDocument(main_rfh());
    prefetch_document_manager->DidStartNavigation(
        mock_navigation_handle_.get());
  }

  absl::optional<PrefetchServingPageMetrics>
  GetMetricsForMostRecentNavigation() {
    if (!mock_navigation_handle_)
      return absl::nullopt;

    return PrefetchServingPageMetrics::GetForNavigationHandle(
        *mock_navigation_handle_);
  }

  PrefetchMatchResolver* GetPrefetchMatchResolverForMostRecentNavigation() {
    if (!mock_navigation_handle_) {
      return nullptr;
    }

    PrefetchMatchResolver::CreateForNavigationHandle(*mock_navigation_handle_);
    return PrefetchMatchResolver::GetForNavigationHandle(
        *mock_navigation_handle_);
  }

  void GetPrefetchToServe(
      base::test::TestFuture<PrefetchContainer::Reader>& future,
      const GURL& url,
      GlobalRenderFrameHostId previous_render_frame_host_id) {
    if (!previous_render_frame_host_id) {
      previous_render_frame_host_id = main_rfh()->GetGlobalId();
    }
    PrefetchMatchResolver* prefetch_match_resolver =
        GetPrefetchMatchResolverForMostRecentNavigation();
    prefetch_match_resolver->SetOnPrefetchToServeReadyCallback(base::BindOnce(
        [](base::test::TestFuture<PrefetchContainer::Reader>* future,
           std::vector<PrefetchRequestHandler>* request_handler_keep_alive,
           PrefetchContainer::Reader prefetch_to_serve) {
          if (prefetch_to_serve) {
            // When GetPrefetchToServe() is successful, also call
            // `CreateRequestHandler()` to simulate
            // `PrefetchURLLoaderInterceptor::OnGetPrefetchComplete()` behavior,
            // which is the primary non-test `GetPrefetchToServe()` code path.
            auto request_handler = prefetch_to_serve.CreateRequestHandler();
            CHECK(request_handler);
            // Keep-alive the PrefetchRequestHandler, because destructing
            // `request_handler` here can signal that the serving is finished,
            // and e.g. close body mojo pipe.
            request_handler_keep_alive->push_back(std::move(request_handler));
          }
          future->SetValue(std::move(prefetch_to_serve));
        },
        base::Unretained(&future),
        base::Unretained(&request_handler_keep_alive_)));
    prefetch_service_->GetPrefetchToServe(
        PrefetchContainer::Key(previous_render_frame_host_id, url),
        *prefetch_match_resolver);
  }

  // A valid `previous_render_frame_host_id` is given as an argument when
  // to test that prefetched results are not used for unexpected initiator
  // Documents. In other cases, use the ID of the expected initiator
  // Document (RenderFrameHost where the `PrefetchDocumentManager` is
  // associated).
  PrefetchContainer::Reader GetPrefetchToServe(
      const GURL& url,
      GlobalRenderFrameHostId previous_render_frame_host_id =
          GlobalRenderFrameHostId()) {
    base::test::TestFuture<PrefetchContainer::Reader> future;
    GetPrefetchToServe(future, url, previous_render_frame_host_id);
    return future.Take();
  }

  ScopedPrefetchServiceContentBrowserClient* test_content_browser_client() {
    return test_content_browser_client_.get();
  }

  ukm::TestAutoSetUkmRecorder* test_ukm_recorder() {
    return test_ukm_recorder_.get();
  }

  const test::PreloadingAttemptUkmEntryBuilder* attempt_entry_builder() {
    return attempt_entry_builder_.get();
  }

  ukm::SourceId ForceLogsUploadAndGetUkmId() {
    MockNavigationHandle mock_handle;
    mock_handle.set_is_in_primary_main_frame(true);
    mock_handle.set_is_same_document(false);
    mock_handle.set_has_committed(true);
    // Makes sure the accurate bit is always false.
    mock_handle.set_url(GURL("http://Not.Accurate.Trigger.Url/"));
    auto* preloading_data =
        PreloadingData::GetOrCreateForWebContents(web_contents());
    // Sets the accurate bit, and records `TimeToNextNavigation`.
    static_cast<PreloadingDataImpl*>(preloading_data)
        ->DidStartNavigation(&mock_handle);
    // Records the UKMs.
    static_cast<PreloadingDataImpl*>(preloading_data)
        ->DidFinishNavigation(&mock_handle);
    return mock_handle.GetNextPageUkmSourceId();
  }

  struct ExpectCorrectUkmLogsArgs {
    PreloadingEligibility eligibility = PreloadingEligibility::kEligible;
    PreloadingHoldbackStatus holdback = PreloadingHoldbackStatus::kAllowed;
    PreloadingTriggeringOutcome outcome = PreloadingTriggeringOutcome::kReady;
    PreloadingFailureReason failure = PreloadingFailureReason::kUnspecified;
    bool is_accurate = false;
    bool expect_ready_time = false;
    blink::mojom::SpeculationEagerness eagerness =
        blink::mojom::SpeculationEagerness::kEager;
  };
  void ExpectCorrectUkmLogs(ExpectCorrectUkmLogsArgs args) {
    const auto source_id = ForceLogsUploadAndGetUkmId();
    auto actual_attempts = test_ukm_recorder()->GetEntries(
        ukm::builders::Preloading_Attempt::kEntryName,
        test::kPreloadingAttemptUkmMetrics);
    EXPECT_EQ(actual_attempts.size(), 1u);

    absl::optional<base::TimeDelta> ready_time = absl::nullopt;
    if (args.outcome == PreloadingTriggeringOutcome::kReady ||
        args.outcome == PreloadingTriggeringOutcome::kSuccess ||
        args.expect_ready_time) {
      ready_time = base::ScopedMockElapsedTimersForTest::kMockElapsedTime;
    }

    const auto expected_attempts = {attempt_entry_builder()->BuildEntry(
        source_id, PreloadingType::kPrefetch, args.eligibility, args.holdback,
        args.outcome, args.failure, args.is_accurate, ready_time,
        args.eagerness)};

    EXPECT_THAT(actual_attempts,
                testing::UnorderedElementsAreArray(expected_attempts))
        << test::ActualVsExpectedUkmEntriesToString(actual_attempts,
                                                    expected_attempts);
    // We do not test the `PreloadingPrediction` as it is added in
    // `PreloadingDecider`.
  }

 protected:
  network::TestURLLoaderFactory::PendingRequest* GetPendingRequestByUrl(
      const GURL& url) {
    auto& pending_requests = *test_url_loader_factory_.pending_requests();
    auto it = base::ranges::find(pending_requests, url,
                                 [](const auto& pending_request) {
                                   return pending_request.request.url;
                                 });
    if (it == pending_requests.end()) {
      return nullptr;
    }
    network::TestURLLoaderFactory::PendingRequest* request = &*it;
    return request;
  }

  void VerifyCommonRequestState(
      const GURL& url,
      const VerifyCommonRequestStateOptions& options,
      const network::TestURLLoaderFactory::PendingRequest* request) {
    ASSERT_TRUE(request);

    EXPECT_EQ(request->request.url, url);
    EXPECT_EQ(request->request.method, "GET");
    EXPECT_TRUE(request->request.enable_load_timing);
    EXPECT_EQ(request->request.load_flags,
              net::LOAD_DISABLE_CACHE | net::LOAD_PREFETCH);
    EXPECT_EQ(request->request.credentials_mode,
              network::mojom::CredentialsMode::kInclude);

    std::string purpose_value;
    EXPECT_TRUE(request->request.headers.GetHeader("Purpose", &purpose_value));
    EXPECT_EQ(purpose_value, "prefetch");

    std::string sec_purpose_value;
    EXPECT_TRUE(
        request->request.headers.GetHeader("Sec-Purpose", &sec_purpose_value));
    EXPECT_EQ(sec_purpose_value, options.use_prefetch_proxy
                                     ? "prefetch;anonymous-client-ip"
                                     : "prefetch");

    std::string accept_value;
    EXPECT_TRUE(request->request.headers.GetHeader("Accept", &accept_value));
    EXPECT_EQ(accept_value, FrameAcceptHeaderValue(/*allow_sxg_responses=*/true,
                                                   browser_context()));

    std::string upgrade_insecure_request_value;
    EXPECT_TRUE(request->request.headers.GetHeader(
        "Upgrade-Insecure-Requests", &upgrade_insecure_request_value));
    EXPECT_EQ(upgrade_insecure_request_value, "1");

    ASSERT_TRUE(request->request.trusted_params.has_value());
    VerifyIsolationInfo(request->request.trusted_params->isolation_info);

    EXPECT_EQ(request->request.priority, options.expected_priority);
  }

  void SendHeadOfResponseAndWait(
      net::HttpStatusCode http_status,
      const std::string mime_type,
      bool use_prefetch_proxy,
      std::vector<std::pair<std::string, std::string>> headers,
      uint32_t expected_total_body_size,
      network::TestURLLoaderFactory::PendingRequest* request) {
    ASSERT_FALSE(producer_handle_for_gurl_.count(request->request.url));
    ASSERT_TRUE(request);
    ASSERT_TRUE(request->client);

    auto head = CreateURLResponseHeadForPrefetch(http_status, mime_type,
                                                 use_prefetch_proxy, headers,
                                                 request->request.url);

    mojo::ScopedDataPipeConsumerHandle body;
    EXPECT_EQ(mojo::CreateDataPipe(
                  expected_total_body_size,
                  producer_handle_for_gurl_[request->request.url], body),
              MOJO_RESULT_OK);

    request->client->OnReceiveResponse(std::move(head), std::move(body),
                                       absl::nullopt);
    task_environment()->RunUntilIdle();
  }

  void SendBodyContentOfResponseAndWait(
      const std::string& body,
      network::TestURLLoaderFactory::PendingRequest* request) {
    ASSERT_TRUE(producer_handle_for_gurl_.count(request->request.url));
    ASSERT_TRUE(producer_handle_for_gurl_[request->request.url]);

    uint32_t bytes_written = body.size();
    EXPECT_EQ(
        producer_handle_for_gurl_[request->request.url]->WriteData(
            body.data(), &bytes_written, MOJO_WRITE_DATA_FLAG_ALL_OR_NONE),
        MOJO_RESULT_OK);
    task_environment()->RunUntilIdle();
  }

  void CompleteResponseAndWait(
      net::Error net_error,
      uint32_t expected_total_body_size,
      network::TestURLLoaderFactory::PendingRequest* request) {
    ASSERT_TRUE(request);
    ASSERT_TRUE(request->client);
    if (producer_handle_for_gurl_.count(request->request.url)) {
      producer_handle_for_gurl_[request->request.url].reset();
      producer_handle_for_gurl_.erase(request->request.url);
    }

    network::URLLoaderCompletionStatus completion_status(net_error);
    completion_status.decoded_body_length = expected_total_body_size;
    request->client->OnComplete(completion_status);
    task_environment()->RunUntilIdle();

    test_url_loader_factory_.ClearResponses();
  }

  std::unique_ptr<PrefetchFakeServiceWorkerContext> service_worker_context_;
  mojo::Remote<network::mojom::CookieManager> cookie_manager_;

  network::TestURLLoaderFactory test_url_loader_factory_;
  scoped_refptr<network::SharedURLLoaderFactory>
      test_shared_url_loader_factory_;

  base::test::ScopedFeatureList scoped_feature_list_;
  // Disable sampling of UKM preloading logs.
  content::test::PreloadingConfigOverride preloading_config_override_;
  std::unique_ptr<PrefetchService> prefetch_service_;

  std::unique_ptr<testing::NiceMock<MockNavigationHandle>>
      mock_navigation_handle_;

  std::unique_ptr<ScopedPrefetchServiceContentBrowserClient>
      test_content_browser_client_;

  std::map<GURL, mojo::ScopedDataPipeProducerHandle> producer_handle_for_gurl_;
  std::unique_ptr<ukm::TestAutoSetUkmRecorder> test_ukm_recorder_;
  std::unique_ptr<test::PreloadingAttemptUkmEntryBuilder>
      attempt_entry_builder_;

  std::unique_ptr<base::ScopedMockElapsedTimersForTest> scoped_test_timer_;

  std::vector<PrefetchRequestHandler> request_handler_keep_alive_;
};

TEST_F(PrefetchServiceTest, SuccessCase) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  // No servable PrefetchContainer is returned for different RenderFrameHost.
  GlobalRenderFrameHostId different_render_frame_host_id =
      main_rfh()->GetGlobalId();
  different_render_frame_host_id.child_id += 1;
  PrefetchContainer::Reader serveable_reader_for_different_initiator =
      GetPrefetchToServe(GURL("https://example.com"),
                         different_render_frame_host_id);
  ASSERT_FALSE(serveable_reader_for_different_initiator);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);
  ASSERT_TRUE(serveable_reader.GetPrefetchContainer()->GetHead());
  EXPECT_TRUE(serveable_reader.GetPrefetchContainer()
                  ->GetHead()
                  ->was_in_prefetch_cache);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.AfterClick.RedirectChainSize", 1, 1);

  ExpectCorrectUkmLogs({});

  histogram_tester.ExpectUniqueSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.WasBlockedUntilHeadWhenServing.%s",
          GetPrefetchEagernessHistogramSuffix(
              blink::mojom::SpeculationEagerness::kEager)
              .c_str()),
      false, 1);
}

TEST_F(PrefetchServiceTest, NoPrefetchingPreloadingDisabled) {
  base::HistogramTester histogram_tester;

  std::unique_ptr<MockPrefetchServiceDelegate> mock_prefetch_service_delegate =
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(
          /*num_on_prefetch_likely_calls=*/0);

  // When preloading is disabled, then |PrefetchService| doesn't take the
  // prefetch at all.
  EXPECT_CALL(*mock_prefetch_service_delegate, IsSomePreloadingEnabled)
      .Times(1)
      .WillOnce(testing::Return(PreloadingEligibility::kPreloadingDisabled));

  MakePrefetchService(std::move(mock_prefetch_service_delegate));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 0);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(
      serving_page_metrics->prefetch_status.value(),
      static_cast<int>(PrefetchStatus::kPrefetchNotEligiblePreloadingDisabled));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs(
      {.eligibility = PreloadingEligibility::kPreloadingDisabled,
       .holdback = PreloadingHoldbackStatus::kUnspecified,
       .outcome = PreloadingTriggeringOutcome::kUnspecified});
}

TEST_F(PrefetchServiceTest, NoPrefetchingDomainNotInAllowList) {
  base::HistogramTester histogram_tester;

  std::unique_ptr<MockPrefetchServiceDelegate> mock_prefetch_service_delegate =
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(
          /*num_on_prefetch_likely_calls=*/0);

  // When referring page is not in allow list, then |PrefetchService| doesn't
  // take the prefetch at all.
  EXPECT_CALL(*mock_prefetch_service_delegate,
              IsDomainInPrefetchAllowList(testing::_))
      .Times(1)
      .WillOnce(testing::Return(false));

  MakePrefetchService(std::move(mock_prefetch_service_delegate));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 0);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_FALSE(serving_page_metrics->prefetch_status);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  // `IsDomainInPrefetchAllowList` returns false so we did not reach the
  // eligibility check.
  ExpectCorrectUkmLogs({.eligibility = PreloadingEligibility::kUnspecified,
                        .holdback = PreloadingHoldbackStatus::kUnspecified,
                        .outcome = PreloadingTriggeringOutcome::kUnspecified});
}

class PrefetchServiceAllowAllDomainsTest : public PrefetchServiceTest {
 public:
  void InitScopedFeatureList() override {
    scoped_feature_list_.InitWithFeaturesAndParameters(
        {{features::kPrefetchUseContentRefactor,
          {{"ineligible_decoy_request_probability", "0"},
           {"prefetch_container_lifetime_s", "-1"},
           {"allow_all_domains", "true"}}}},
        {network::features::kPrefetchNoVarySearch});
  }
};

TEST_F(PrefetchServiceAllowAllDomainsTest, AllowAllDomains) {
  base::HistogramTester histogram_tester;

  std::unique_ptr<MockPrefetchServiceDelegate> mock_prefetch_service_delegate =
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>();

  // When "allow_all_domains" is set to true, then we can prefetch from all
  // domains, not just those in the allow list.
  EXPECT_CALL(*mock_prefetch_service_delegate,
              IsDomainInPrefetchAllowList(testing::_))
      .Times(0);

  MakePrefetchService(std::move(mock_prefetch_service_delegate));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);

  ExpectCorrectUkmLogs({});
}

class PrefetchServiceAllowAllDomainsForExtendedPreloadingTest
    : public PrefetchServiceTest {
 public:
  void InitScopedFeatureList() override {
    scoped_feature_list_.InitWithFeaturesAndParameters(
        {{features::kPrefetchUseContentRefactor,
          {{"ineligible_decoy_request_probability", "0"},
           {"prefetch_container_lifetime_s", "-1"},
           {"allow_all_domains_for_extended_preloading", "true"}}}},
        {network::features::kPrefetchNoVarySearch});
  }
};

TEST_F(PrefetchServiceAllowAllDomainsForExtendedPreloadingTest,
       ExtendedPreloadingEnabled) {
  base::HistogramTester histogram_tester;

  std::unique_ptr<MockPrefetchServiceDelegate> mock_prefetch_service_delegate =
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>();

  // Allow all domains if and only if extended preloading is enabled.
  EXPECT_CALL(*mock_prefetch_service_delegate, IsExtendedPreloadingEnabled)
      .Times(1)
      .WillOnce(testing::Return(true));
  EXPECT_CALL(*mock_prefetch_service_delegate,
              IsDomainInPrefetchAllowList(testing::_))
      .Times(0);

  MakePrefetchService(std::move(mock_prefetch_service_delegate));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);

  ExpectCorrectUkmLogs({});
}

TEST_F(PrefetchServiceAllowAllDomainsForExtendedPreloadingTest,
       ExtendedPreloadingDisabled) {
  base::HistogramTester histogram_tester;

  std::unique_ptr<MockPrefetchServiceDelegate> mock_prefetch_service_delegate =
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(
          /*num_on_prefetch_likely_calls=*/0);

  // If extended preloading is disabled, then we check the allow list.
  EXPECT_CALL(*mock_prefetch_service_delegate, IsExtendedPreloadingEnabled)
      .Times(1)
      .WillOnce(testing::Return(false));
  EXPECT_CALL(*mock_prefetch_service_delegate,
              IsDomainInPrefetchAllowList(testing::_))
      .Times(1)
      .WillOnce(testing::Return(false));

  MakePrefetchService(std::move(mock_prefetch_service_delegate));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 0);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_FALSE(serving_page_metrics->prefetch_status);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs({.eligibility = PreloadingEligibility::kUnspecified,
                        .holdback = PreloadingHoldbackStatus::kUnspecified,
                        .outcome = PreloadingTriggeringOutcome::kUnspecified});
}

TEST_F(PrefetchServiceTest, NonProxiedPrefetchDoesNotRequireAllowList) {
  base::HistogramTester histogram_tester;

  // Assume we have a delegate which will not grant access to the proxy for this
  // domain. Nonetheless a non-proxied prefetch should work.
  std::unique_ptr<MockPrefetchServiceDelegate> mock_prefetch_service_delegate =
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>();
  ON_CALL(*mock_prefetch_service_delegate, IsExtendedPreloadingEnabled)
      .WillByDefault(testing::Return(false));
  ON_CALL(*mock_prefetch_service_delegate,
          IsDomainInPrefetchAllowList(testing::_))
      .WillByDefault(testing::Return(false));

  MakePrefetchService(std::move(mock_prefetch_service_delegate));

  blink::mojom::Referrer referrer;
  referrer.url = GURL("https://example.com/referrer");

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/false,
                   blink::mojom::SpeculationEagerness::kEager),
      /*referrer=*/referrer);
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = false});
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/false,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_FALSE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);

  ExpectCorrectUkmLogs({});
}

TEST_F(PrefetchServiceTest, NotEligibleHostnameNonUnique) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  PrefetchService::SetHostNonUniqueFilterForTesting(
      [](base::StringPiece) { return true; });

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 0);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(
      serving_page_metrics->prefetch_status.value(),
      static_cast<int>(PrefetchStatus::kPrefetchNotEligibleHostIsNonUnique));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs(
      {.eligibility = ToPreloadingEligibility(
           PrefetchStatus::kPrefetchNotEligibleHostIsNonUnique),
       .holdback = PreloadingHoldbackStatus::kUnspecified,
       .outcome = PreloadingTriggeringOutcome::kUnspecified});
}

TEST_F(PrefetchServiceTest, NotEligibleDataSaverEnabled) {
  base::HistogramTester histogram_tester;

  std::unique_ptr<MockPrefetchServiceDelegate> mock_prefetch_service_delegate =
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(
          /*num_on_prefetch_likely_calls=*/0);

  // When data saver is enabled, then |PrefetchService| doesn't start the
  // prefetch at all.
  EXPECT_CALL(*mock_prefetch_service_delegate, IsSomePreloadingEnabled)
      .Times(1)
      .WillOnce(testing::Return(PreloadingEligibility::kDataSaverEnabled));

  MakePrefetchService(std::move(mock_prefetch_service_delegate));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 0);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(
      serving_page_metrics->prefetch_status.value(),
      static_cast<int>(PrefetchStatus::kPrefetchNotEligibleDataSaverEnabled));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs({.eligibility = PreloadingEligibility::kDataSaverEnabled,
                        .holdback = PreloadingHoldbackStatus::kUnspecified,
                        .outcome = PreloadingTriggeringOutcome::kUnspecified});
}

TEST_F(PrefetchServiceTest, NotEligibleNonHttps) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("http://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("http://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 0);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(
      serving_page_metrics->prefetch_status.value(),
      static_cast<int>(PrefetchStatus::kPrefetchNotEligibleSchemeIsNotHttps));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs(
      {.eligibility = ToPreloadingEligibility(
           PrefetchStatus::kPrefetchNotEligibleSchemeIsNotHttps),
       .holdback = PreloadingHoldbackStatus::kUnspecified,
       .outcome = PreloadingTriggeringOutcome::kUnspecified});
}

TEST_F(PrefetchServiceTest, NotEligiblePrefetchProxyNotAvailable) {
  base::HistogramTester histogram_tester;

  std::unique_ptr<MockPrefetchServiceDelegate> mock_prefetch_service_delegate =
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>();

  // If the prefetch proxy URL is invalid, then we can't make prefetches that
  // require the proxy. However, non-proxied prefetches are fine.
  EXPECT_CALL(*mock_prefetch_service_delegate, GetDefaultPrefetchProxyHost)
      .Times(1)
      .WillOnce(testing::Return(GURL("")));

  MakePrefetchService(std::move(mock_prefetch_service_delegate));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 0);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchProxyNotAvailable));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs({.eligibility = ToPreloadingEligibility(
                            PrefetchStatus::kPrefetchProxyNotAvailable),
                        .holdback = PreloadingHoldbackStatus::kUnspecified,
                        .outcome = PreloadingTriggeringOutcome::kUnspecified});
}

TEST_F(PrefetchServiceTest,
       EligiblePrefetchProxyNotAvailableNonProxiedPrefetch) {
  base::HistogramTester histogram_tester;

  std::unique_ptr<MockPrefetchServiceDelegate> mock_prefetch_service_delegate =
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>();

  // If the prefetch proxy URL is invalid, then we can't make prefetches that
  // require the proxy. However, non-proxied prefetches are fine.
  EXPECT_CALL(*mock_prefetch_service_delegate, GetDefaultPrefetchProxyHost)
      .Times(1)
      .WillOnce(testing::Return(GURL("")));

  MakePrefetchService(std::move(mock_prefetch_service_delegate));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/false,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"));
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/false,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_FALSE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);

  ExpectCorrectUkmLogs({});
}

TEST_F(PrefetchServiceTest, NotEligibleOriginWithinRetryAfterWindow) {
  base::HistogramTester histogram_tester;

  std::unique_ptr<MockPrefetchServiceDelegate> mock_prefetch_service_delegate =
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>();

  EXPECT_CALL(*mock_prefetch_service_delegate,
              IsOriginOutsideRetryAfterWindow(GURL("https://example.com")))
      .Times(1)
      .WillOnce(testing::Return(false));

  MakePrefetchService(std::move(mock_prefetch_service_delegate));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 0);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchIneligibleRetryAfter));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs({.eligibility = ToPreloadingEligibility(
                            PrefetchStatus::kPrefetchIneligibleRetryAfter),
                        .holdback = PreloadingHoldbackStatus::kUnspecified,
                        .outcome = PreloadingTriggeringOutcome::kUnspecified});
}

TEST_F(PrefetchServiceTest, EligibleNonHttpsNonProxiedPotentiallyTrustworthy) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://localhost"),
      PrefetchType(/*use_prefetch_proxy=*/false,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://localhost"));
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/false,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://localhost"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_FALSE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://localhost"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);

  ExpectCorrectUkmLogs({});
}

TEST_F(PrefetchServiceTest, NotEligibleServiceWorkerRegistered) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  service_worker_context_->AddRegistrationToRegisteredStorageKeys(
      blink::StorageKey::CreateFromStringForTesting("https://example.com"));
  service_worker_context_->AddServiceWorkerScope(
      GURL("https://example.com"),
      ServiceWorkerCapability::SERVICE_WORKER_WITH_FETCH_HANDLER);

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 0);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(
                PrefetchStatus::kPrefetchNotEligibleUserHasServiceWorker));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs(
      {.eligibility = ToPreloadingEligibility(
           PrefetchStatus::kPrefetchNotEligibleUserHasServiceWorker),
       .holdback = PreloadingHoldbackStatus::kUnspecified,
       .outcome = PreloadingTriggeringOutcome::kUnspecified});
}

TEST_F(PrefetchServiceTest,
       NotEligibleServiceWorkerRegisteredServiceWorkerCheckUKM) {
  // ukm::TestAutoSetUkmRecorder ukm_recorder;
  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  service_worker_context_->AddRegistrationToRegisteredStorageKeys(
      blink::StorageKey::CreateFromStringForTesting("https://example.com"));
  service_worker_context_->AddServiceWorkerScope(
      GURL("https://example.com"),
      ServiceWorkerCapability::SERVICE_WORKER_WITH_FETCH_HANDLER);
  service_worker_context_->SetServiceWorkerCheckDuration(
      base::Microseconds(kServiceWorkerCheckDuration));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/false,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ForceLogsUploadAndGetUkmId();
  // Now check the UKM records.
  using UkmEntry = ukm::builders::Preloading_Attempt;
  auto actual_attempts = test_ukm_recorder()->GetEntries(
      UkmEntry::kEntryName,
      {
          UkmEntry::kPrefetchServiceWorkerRegisteredCheckName,
          UkmEntry::kPrefetchServiceWorkerRegisteredForURLCheckDurationName,
      });
  EXPECT_EQ(actual_attempts.size(), 1u);
  ASSERT_TRUE(actual_attempts[0].metrics.count(
      UkmEntry::kPrefetchServiceWorkerRegisteredCheckName));
  EXPECT_EQ(actual_attempts[0]
                .metrics[UkmEntry::kPrefetchServiceWorkerRegisteredCheckName],
            static_cast<int64_t>(
                PreloadingAttemptImpl::ServiceWorkerRegisteredCheck::kPath));
  ASSERT_TRUE(actual_attempts[0].metrics.count(
      UkmEntry::kPrefetchServiceWorkerRegisteredForURLCheckDurationName));
  EXPECT_EQ(
      actual_attempts[0].metrics
          [UkmEntry::kPrefetchServiceWorkerRegisteredForURLCheckDurationName],
      ukm::GetExponentialBucketMin(
          kServiceWorkerCheckDuration,
          PreloadingAttemptImpl::
              kServiceWorkerRegisteredCheckDurationBucketSpacing));
}

TEST_F(PrefetchServiceTest, EligibleServiceWorkerNotRegistered) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  service_worker_context_->AddRegistrationToRegisteredStorageKeys(
      blink::StorageKey::CreateFromStringForTesting("https://other.com"));
  service_worker_context_->AddServiceWorkerScope(
      GURL("https://other.com"),
      ServiceWorkerCapability::SERVICE_WORKER_WITH_FETCH_HANDLER);

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);

  ExpectCorrectUkmLogs({});
}

TEST_F(PrefetchServiceTest,
       EligibleServiceWorkerNotRegisteredServiceWorkerCheckUKM) {
  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  service_worker_context_->AddRegistrationToRegisteredStorageKeys(
      blink::StorageKey::CreateFromStringForTesting("https://other.com"));
  service_worker_context_->AddServiceWorkerScope(
      GURL("https://other.com"),
      ServiceWorkerCapability::SERVICE_WORKER_WITH_FETCH_HANDLER);

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);

  ForceLogsUploadAndGetUkmId();
  // Now check the UKM records.
  using UkmEntry = ukm::builders::Preloading_Attempt;
  auto actual_attempts = test_ukm_recorder()->GetEntries(
      UkmEntry::kEntryName,
      {
          UkmEntry::kPrefetchServiceWorkerRegisteredCheckName,
          UkmEntry::kPrefetchServiceWorkerRegisteredForURLCheckDurationName,
      });
  EXPECT_EQ(actual_attempts.size(), 1u);

  ASSERT_TRUE(actual_attempts[0].metrics.count(
      UkmEntry::kPrefetchServiceWorkerRegisteredCheckName));
  EXPECT_EQ(
      actual_attempts[0]
          .metrics[UkmEntry::kPrefetchServiceWorkerRegisteredCheckName],
      static_cast<int64_t>(
          PreloadingAttemptImpl::ServiceWorkerRegisteredCheck::kOriginOnly));
  ASSERT_TRUE(actual_attempts[0].metrics.count(
      UkmEntry::kPrefetchServiceWorkerRegisteredForURLCheckDurationName));
  EXPECT_EQ(
      actual_attempts[0].metrics
          [UkmEntry::kPrefetchServiceWorkerRegisteredForURLCheckDurationName],
      ukm::GetExponentialBucketMin(
          0, PreloadingAttemptImpl::
                 kServiceWorkerRegisteredCheckDurationBucketSpacing));
}

TEST_F(PrefetchServiceTest, EligibleServiceWorkerRegistered) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  service_worker_context_->AddRegistrationToRegisteredStorageKeys(
      blink::StorageKey::CreateFromStringForTesting("https://example.com"));
  service_worker_context_->AddServiceWorkerScope(
      GURL("https://example.com"),
      ServiceWorkerCapability::SERVICE_WORKER_NO_FETCH_HANDLER);

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);

  ExpectCorrectUkmLogs({});
}

TEST_F(PrefetchServiceTest,
       EligibleServiceWorkerRegisteredServiceWorkerCheckUKM) {
  ukm::TestAutoSetUkmRecorder ukm_recorder;
  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  service_worker_context_->AddRegistrationToRegisteredStorageKeys(
      blink::StorageKey::CreateFromStringForTesting("https://example.com"));
  service_worker_context_->AddServiceWorkerScope(
      GURL("https://example.com"),
      ServiceWorkerCapability::SERVICE_WORKER_NO_FETCH_HANDLER);
  service_worker_context_->SetServiceWorkerCheckDuration(
      base::Microseconds(kServiceWorkerCheckDuration));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/false,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 1);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ForceLogsUploadAndGetUkmId();
  // Now check the UKM records.
  using UkmEntry = ukm::builders::Preloading_Attempt;
  auto actual_attempts = test_ukm_recorder()->GetEntries(
      UkmEntry::kEntryName,
      {
          UkmEntry::kPrefetchServiceWorkerRegisteredCheckName,
          UkmEntry::kPrefetchServiceWorkerRegisteredForURLCheckDurationName,
      });
  EXPECT_EQ(actual_attempts.size(), 1u);

  ASSERT_TRUE(actual_attempts[0].metrics.count(
      UkmEntry::kPrefetchServiceWorkerRegisteredCheckName));
  EXPECT_EQ(actual_attempts[0]
                .metrics[UkmEntry::kPrefetchServiceWorkerRegisteredCheckName],
            static_cast<int64_t>(
                PreloadingAttemptImpl::ServiceWorkerRegisteredCheck::kPath));
  ASSERT_TRUE(actual_attempts[0].metrics.count(
      UkmEntry::kPrefetchServiceWorkerRegisteredForURLCheckDurationName));
  EXPECT_EQ(
      actual_attempts[0].metrics
          [UkmEntry::kPrefetchServiceWorkerRegisteredForURLCheckDurationName],
      ukm::GetExponentialBucketMin(
          kServiceWorkerCheckDuration,
          PreloadingAttemptImpl::
              kServiceWorkerRegisteredCheckDurationBucketSpacing));
}

TEST_F(PrefetchServiceTest, EligibleServiceWorkerNotRegisteredAtThisPath) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  service_worker_context_->AddRegistrationToRegisteredStorageKeys(
      blink::StorageKey::CreateFromStringForTesting("https://example.com"));
  service_worker_context_->AddServiceWorkerScope(
      GURL("https://example.com/sw"),
      ServiceWorkerCapability::SERVICE_WORKER_WITH_FETCH_HANDLER);

  MakePrefetchOnMainFrame(
      GURL("https://example.com/non_sw/index.html"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com/non_sw/index.html"),
                           {.use_prefetch_proxy = true});
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com/non_sw/index.html"),
           main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com/non_sw/index.html"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);

  ExpectCorrectUkmLogs({});
}

TEST_F(PrefetchServiceTest, NotEligibleUserHasCookies) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  ASSERT_TRUE(SetCookie(GURL("https://example.com"), "testing"));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 0);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(
      serving_page_metrics->prefetch_status.value(),
      static_cast<int>(PrefetchStatus::kPrefetchNotEligibleUserHasCookies));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs({.eligibility = ToPreloadingEligibility(
                            PrefetchStatus::kPrefetchNotEligibleUserHasCookies),
                        .holdback = PreloadingHoldbackStatus::kUnspecified,
                        .outcome = PreloadingTriggeringOutcome::kUnspecified});
}

TEST_F(PrefetchServiceTest, EligibleUserHasCookiesForDifferentUrl) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  ASSERT_TRUE(SetCookie(GURL("https://other.com"), "testing"));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);

  ExpectCorrectUkmLogs({});
}

TEST_F(PrefetchServiceTest, EligibleSameOriginPrefetchCanHaveExistingCookies) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  ASSERT_TRUE(SetCookie(GURL("https://example.com"), "testing"));

  blink::mojom::Referrer referrer;
  referrer.url = GURL("https://example.com/referrer");
  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/false,
                   blink::mojom::SpeculationEagerness::kEager),
      /*referrer=*/referrer);
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"));
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/false,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_FALSE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);

  ExpectCorrectUkmLogs({});
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_FailedCookiesChangedAfterPrefetchStarted \
  DISABLED_FailedCookiesChangedAfterPrefetchStarted
#else
#define MAYBE_FailedCookiesChangedAfterPrefetchStarted \
  FailedCookiesChangedAfterPrefetchStarted
#endif
TEST_F(PrefetchServiceTest, MAYBE_FailedCookiesChangedAfterPrefetchStarted) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  // Adding a cookie after the prefetch has started will cause it to fail when
  // being served.
  ASSERT_TRUE(SetCookie(GURL("https://example.com"), "testing"));
  task_environment()->RunUntilIdle();

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchNotUsedCookiesChanged));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  // ReadyTime will be included in the UKM, because the prefetch was ready, and
  // then failed.
  ExpectCorrectUkmLogs({.outcome = PreloadingTriggeringOutcome::kFailure,
                        .failure = ToPreloadingFailureReason(
                            PrefetchStatus::kPrefetchNotUsedCookiesChanged),
                        .expect_ready_time = true});
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_SameOriginPrefetchIgnoresProxyRequirement \
  DISABLED_SameOriginPrefetchIgnoresProxyRequirement
#else
#define MAYBE_SameOriginPrefetchIgnoresProxyRequirement \
  SameOriginPrefetchIgnoresProxyRequirement
#endif
TEST_F(PrefetchServiceTest, MAYBE_SameOriginPrefetchIgnoresProxyRequirement) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  // Make a same-origin prefetch that requires the proxy. The proxy requirement
  // is only enforced for cross-origin requests.
  blink::mojom::Referrer referrer;
  referrer.url = GURL("https://example.com/referrer");
  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager),
      /*referrer=*/referrer);
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"));
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/false,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  // serving_page_metrics->required_private_prefetch_proxy will be true if the
  // prefetch is marked as requiring the proxy when cross origin, even if only
  // prefetch request was same-origin.
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);

  ExpectCorrectUkmLogs({});
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_NotEligibleSameSiteCrossOriginPrefetchRequiresProxy \
  DISABLED_NotEligibleSameSiteCrossOriginPrefetchRequiresProxy
#else
#define MAYBE_NotEligibleSameSiteCrossOriginPrefetchRequiresProxy \
  NotEligibleSameSiteCrossOriginPrefetchRequiresProxy
#endif
TEST_F(PrefetchServiceTest,
       MAYBE_NotEligibleSameSiteCrossOriginPrefetchRequiresProxy) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  // Make a same-site cross-origin prefetch that requires the proxy. These types
  // of prefetches are blocked.
  blink::mojom::Referrer referrer;
  referrer.url = GURL("https://example.com/referrer");
  MakePrefetchOnMainFrame(
      GURL("https://other.example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager),
      /*referrer=*/referrer);
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("https://other.example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 0);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(
      serving_page_metrics->prefetch_status.value(),
      static_cast<int>(
          PrefetchStatus::
              kPrefetchNotEligibleSameSiteCrossOriginPrefetchRequiredProxy));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://other.example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs(
      {.eligibility = ToPreloadingEligibility(
           PrefetchStatus::
               kPrefetchNotEligibleSameSiteCrossOriginPrefetchRequiredProxy),
       .holdback = PreloadingHoldbackStatus::kUnspecified,
       .outcome = PreloadingTriggeringOutcome::kUnspecified});
}

TEST_F(PrefetchServiceTest, NotEligibleExistingConnectProxy) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  net::ProxyInfo proxy_info;
  proxy_info.UseNamedProxy("proxy.com");
  TestNetworkContext network_context_for_proxy_lookup(proxy_info);
  PrefetchService::SetNetworkContextForProxyLookupForTesting(
      &network_context_for_proxy_lookup);

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 0);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(
      serving_page_metrics->prefetch_status.value(),
      static_cast<int>(PrefetchStatus::kPrefetchNotEligibleExistingProxy));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs({.eligibility = ToPreloadingEligibility(
                            PrefetchStatus::kPrefetchNotEligibleExistingProxy),
                        .holdback = PreloadingHoldbackStatus::kUnspecified,
                        .outcome = PreloadingTriggeringOutcome::kUnspecified});

  PrefetchService::SetNetworkContextForProxyLookupForTesting(nullptr);
}

TEST_F(PrefetchServiceTest, EligibleExistingConnectProxyButSameOriginPrefetch) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  net::ProxyInfo proxy_info;
  proxy_info.UseNamedProxy("proxy.com");
  TestNetworkContext network_context_for_proxy_lookup(proxy_info);
  PrefetchService::SetNetworkContextForProxyLookupForTesting(
      &network_context_for_proxy_lookup);

  blink::mojom::Referrer referrer;
  referrer.url = GURL("https://example.com/referrer");
  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/false,
                   blink::mojom::SpeculationEagerness::kEager),
      /*referrer=*/referrer);
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"));
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/false,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_FALSE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);

  ExpectCorrectUkmLogs({});

  PrefetchService::SetNetworkContextForProxyLookupForTesting(nullptr);
}

TEST_F(PrefetchServiceTest, FailedNon2XXResponseCode) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  MakeResponseAndWait(net::HTTP_NOT_FOUND, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_NOT_FOUND, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchFailedNon2XX));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs({.outcome = PreloadingTriggeringOutcome::kFailure,
                        .failure = ToPreloadingFailureReason(
                            PrefetchStatus::kPrefetchFailedNon2XX)});
}

TEST_F(PrefetchServiceTest, FailedNetError) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  MakeResponseAndWait(net::HTTP_OK, net::ERR_FAILED, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", std::abs(net::ERR_FAILED),
      1);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchFailedNetError));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs({.outcome = PreloadingTriggeringOutcome::kFailure,
                        .failure = ToPreloadingFailureReason(
                            PrefetchStatus::kPrefetchFailedNetError)});
}

TEST_F(PrefetchServiceTest, HandleRetryAfterResponse) {
  base::HistogramTester histogram_tester;

  std::unique_ptr<MockPrefetchServiceDelegate> mock_prefetch_service_delegate =
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>();

  EXPECT_CALL(
      *mock_prefetch_service_delegate,
      ReportOriginRetryAfter(GURL("https://example.com"), base::Seconds(1234)))
      .Times(1);

  MakePrefetchService(std::move(mock_prefetch_service_delegate));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});

  // Simulate the origin responding with a "retry-after" header.
  MakeResponseAndWait(net::HTTP_SERVICE_UNAVAILABLE, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"Retry-After", "1234"}, {"X-Testing", "Hello World"}},
                      "");

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode",
      net::HTTP_SERVICE_UNAVAILABLE, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchFailedNon2XX));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs({.outcome = PreloadingTriggeringOutcome::kFailure,
                        .failure = ToPreloadingFailureReason(
                            PrefetchStatus::kPrefetchFailedNon2XX)});
}

TEST_F(PrefetchServiceTest, SuccessNonHTML) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});

  std::string body = "fake PDF";
  MakeResponseAndWait(net::HTTP_OK, net::OK, "application/pdf",
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, body);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", body.size(), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);

  ExpectCorrectUkmLogs({});
}

TEST_F(PrefetchServiceTest, NotServeableNavigationInDifferentRenderFrameHost) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  // Since the navigation is occurring in a LocalFrameToken other than where the
  // prefetch was requested from, we cannot use it.
  blink::LocalFrameToken other_token(base::UnguessableToken::Create());
  ASSERT_NE(other_token, main_rfh()->GetFrameToken());
  Navigate(GURL("https://example.com"), other_token);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  EXPECT_FALSE(serving_page_metrics);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs({});
}

class PrefetchServiceLimitedPrefetchesTest : public PrefetchServiceTest {
 public:
  void InitScopedFeatureList() override {
    scoped_feature_list_.InitWithFeaturesAndParameters(
        {{features::kPrefetchUseContentRefactor,
          {{"ineligible_decoy_request_probability", "0"},
           {"prefetch_container_lifetime_s", "-1"},
           {"max_srp_prefetches", "2"}}}},
        {network::features::kPrefetchNoVarySearch});
  }
};

TEST_F(PrefetchServiceLimitedPrefetchesTest, LimitedNumberOfPrefetches) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(
          /*num_on_prefetch_likely_calls=*/3));

  // Make 3 prefetches from the same page. PrefetchService should make requests
  // for the first two prefetches but not the third due to the limit on the
  // number of prefetches.
  MakePrefetchOnMainFrame(
      GURL("https://example1.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example1.com"),
                           {.use_prefetch_proxy = true});
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  MakePrefetchOnMainFrame(
      GURL("https://example2.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example2.com"),
                           {.use_prefetch_proxy = true});
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  MakePrefetchOnMainFrame(
      GURL("https://example3.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 3);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 2);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 2);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 2);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 2);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 2);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 3);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 3);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 2);

  Navigate(GURL("https://example1.com"), main_rfh()->GetFrameToken());

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics1 =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics1);
  EXPECT_TRUE(serving_page_metrics1->prefetch_status);
  EXPECT_EQ(serving_page_metrics1->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics1->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics1->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics1->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics1->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader1 =
      GetPrefetchToServe(GURL("https://example1.com"));
  ASSERT_TRUE(serveable_reader1);
  EXPECT_TRUE(serveable_reader1.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader1.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader1.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);

  Navigate(GURL("https://example2.com"), main_rfh()->GetFrameToken());

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics2 =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics2);
  EXPECT_TRUE(serving_page_metrics2->prefetch_status);
  EXPECT_EQ(serving_page_metrics2->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics2->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics2->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics2->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics2->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader2 =
      GetPrefetchToServe(GURL("https://example2.com"));
  ASSERT_TRUE(serveable_reader2);
  EXPECT_TRUE(serveable_reader2.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader2.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader2.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);

  Navigate(GURL("https://example3.com"), main_rfh()->GetFrameToken());

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics3 =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics3);
  // The prefetch attempt that exceeds the limit is just rejected with no
  // chance to update PrefetchServingPageMetrics.
  EXPECT_FALSE(serving_page_metrics3->prefetch_status);
  EXPECT_FALSE(serving_page_metrics3->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics3->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics3->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader3 =
      GetPrefetchToServe(GURL("https://example3.com"));
  EXPECT_FALSE(serveable_reader3);
  {
    const auto source_id = ForceLogsUploadAndGetUkmId();
    auto actual_attempts = test_ukm_recorder()->GetEntries(
        ukm::builders::Preloading_Attempt::kEntryName,
        test::kPreloadingAttemptUkmMetrics);
    EXPECT_EQ(actual_attempts.size(), 3u);

    // The third entry never reaches the holdback status check.
    std::vector<ukm::TestUkmRecorder::HumanReadableUkmEntry> expected_attempts =
        {attempt_entry_builder()->BuildEntry(
             source_id, PreloadingType::kPrefetch,
             PreloadingEligibility::kEligible,
             PreloadingHoldbackStatus::kAllowed,
             PreloadingTriggeringOutcome::kReady,
             PreloadingFailureReason::kUnspecified,
             /*accurate=*/false,
             /*ready_time=*/
             base::ScopedMockElapsedTimersForTest::kMockElapsedTime,
             blink::mojom::SpeculationEagerness::kEager),
         attempt_entry_builder()->BuildEntry(
             source_id, PreloadingType::kPrefetch,
             PreloadingEligibility::kEligible,
             PreloadingHoldbackStatus::kAllowed,
             PreloadingTriggeringOutcome::kReady,
             PreloadingFailureReason::kUnspecified,
             /*accurate=*/false,
             /*ready_time=*/
             base::ScopedMockElapsedTimersForTest::kMockElapsedTime,
             blink::mojom::SpeculationEagerness::kEager),
         attempt_entry_builder()->BuildEntry(
             source_id, PreloadingType::kPrefetch,
             PreloadingEligibility::kEligible,
             PreloadingHoldbackStatus::kAllowed,
             PreloadingTriggeringOutcome::kFailure,
             ToPreloadingFailureReason(
                 content::PrefetchStatus::kPrefetchFailedPerPageLimitExceeded),
             /*accurate=*/false,
             /*ready_time=*/absl::nullopt,
             blink::mojom::SpeculationEagerness::kEager)};
    EXPECT_THAT(actual_attempts,
                testing::UnorderedElementsAreArray(expected_attempts))
        << test::ActualVsExpectedUkmEntriesToString(actual_attempts,
                                                    expected_attempts);
  }
}

class PrefetchServiceWithHTMLOnlyTest : public PrefetchServiceTest {
 public:
  void InitScopedFeatureList() override {
    scoped_feature_list_.InitWithFeaturesAndParameters(
        {{features::kPrefetchUseContentRefactor,
          {{"ineligible_decoy_request_probability", "0"},
           {"prefetch_container_lifetime_s", "-1"},
           {"html_only", "true"}}}},
        {network::features::kPrefetchNoVarySearch});
  }
};

TEST_F(PrefetchServiceWithHTMLOnlyTest, FailedNonHTMLWithHTMLOnly) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});

  std::string body = "fake PDF";
  MakeResponseAndWait(net::HTTP_OK, net::OK, "application/pdf",
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, body);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", body.size(), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchFailedMIMENotSupported));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs({.outcome = PreloadingTriggeringOutcome::kFailure,
                        .failure = ToPreloadingFailureReason(
                            PrefetchStatus::kPrefetchFailedMIMENotSupported)});
}

class PrefetchServiceAlwaysMakeDecoyRequestTest : public PrefetchServiceTest {
 public:
  void InitScopedFeatureList() override {
    scoped_feature_list_.InitWithFeaturesAndParameters(
        {{features::kPrefetchUseContentRefactor,
          {{"ineligible_decoy_request_probability", "1"},
           {"prefetch_container_lifetime_s", "-1"}}},
         {features::kPrefetchRedirects, {}}},
        {network::features::kPrefetchNoVarySearch});
  }
};

TEST_F(PrefetchServiceAlwaysMakeDecoyRequestTest, DecoyRequest) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  ASSERT_TRUE(SetCookie(GURL("https://example.com"), "testing"));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchIsPrivacyDecoy));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);
  // A decoy is considered a failure.
  ExpectCorrectUkmLogs({.outcome = PreloadingTriggeringOutcome::kFailure,
                        .failure = ToPreloadingFailureReason(
                            PrefetchStatus::kPrefetchIsPrivacyDecoy)});
}

TEST_F(PrefetchServiceAlwaysMakeDecoyRequestTest,
       NoDecoyRequestDisableDecoysBasedOnUserSettings) {
  base::HistogramTester histogram_tester;

  std::unique_ptr<MockPrefetchServiceDelegate> mock_prefetch_service_delegate =
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>();

  EXPECT_CALL(*mock_prefetch_service_delegate, DisableDecoysBasedOnUserSettings)
      .Times(1)
      .WillOnce(testing::Return(true));

  MakePrefetchService(std::move(mock_prefetch_service_delegate));

  ASSERT_TRUE(SetCookie(GURL("https://example.com"), "testing"));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 0);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(
      serving_page_metrics->prefetch_status.value(),
      static_cast<int>(PrefetchStatus::kPrefetchNotEligibleUserHasCookies));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs({.eligibility = ToPreloadingEligibility(
                            PrefetchStatus::kPrefetchNotEligibleUserHasCookies),
                        .holdback = PreloadingHoldbackStatus::kUnspecified,
                        .outcome = PreloadingTriggeringOutcome::kUnspecified});
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_RedirectDecoyRequest DISABLED_RedirectDecoyRequest
#else
#define MAYBE_RedirectDecoyRequest RedirectDecoyRequest
#endif
TEST_F(PrefetchServiceAlwaysMakeDecoyRequestTest, MAYBE_RedirectDecoyRequest) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  service_worker_context_->AddRegistrationToRegisteredStorageKeys(
      blink::StorageKey::CreateFromStringForTesting("https://redirect.com"));
  service_worker_context_->AddServiceWorkerScope(
      GURL("https://redirect.com"),
      ServiceWorkerCapability::SERVICE_WORKER_WITH_FETCH_HANDLER);

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  VerifyFollowRedirectParams(0);

  net::RedirectInfo redirect_info;
  redirect_info.new_method = "GET";
  redirect_info.new_referrer_policy =
      net::ReferrerPolicy::REDUCE_GRANULARITY_ON_TRANSITION_CROSS_ORIGIN;
  redirect_info.new_url = GURL("https://redirect.com");
  MakeSingleRedirectAndWait(
      redirect_info,
      CreateURLResponseHeadForPrefetch(
          net::HTTP_PERMANENT_REDIRECT, kHTMLMimeType,
          /*use_prefetch_proxy=*/true, {}, GURL("https://redirect.com")));

  // The redirect is ineligible, but will be followed since the prefetch is now
  // a decoy.
  VerifyFollowRedirectParams(1);

  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchIsPrivacyDecoy));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs({.outcome = PreloadingTriggeringOutcome::kFailure,
                        .failure = ToPreloadingFailureReason(
                            PrefetchStatus::kPrefetchIsPrivacyDecoy)});
}

class PrefetchServiceHoldbackTest : public PrefetchServiceTest {
 public:
  void InitScopedFeatureList() override {
    scoped_feature_list_.InitWithFeaturesAndParameters(
        {{features::kPrefetchUseContentRefactor,
          {{"prefetch_holdback", "true"}}}},
        {});
  }
};

TEST_F(PrefetchServiceHoldbackTest, PrefetchHeldback) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  // Holdback is checked and set after eligibility.
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchHeldback));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs({.holdback = PreloadingHoldbackStatus::kHoldback,
                        .outcome = PreloadingTriggeringOutcome::kUnspecified});
}

class PrefetchServiceIncognitoTest : public PrefetchServiceTest {
 protected:
  std::unique_ptr<BrowserContext> CreateBrowserContext() override {
    auto browser_context = std::make_unique<TestBrowserContext>();
    browser_context->set_is_off_the_record(true);
    return browser_context;
  }
};

TEST_F(PrefetchServiceIncognitoTest, OffTheRecordIneligible) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 0);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(
      serving_page_metrics->prefetch_status.value(),
      static_cast<int>(
          PrefetchStatus::kPrefetchNotEligibleBrowserContextOffTheRecord));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs(
      {.eligibility = ToPreloadingEligibility(
           PrefetchStatus::kPrefetchNotEligibleBrowserContextOffTheRecord),
       .holdback = PreloadingHoldbackStatus::kUnspecified,
       .outcome = PreloadingTriggeringOutcome::kUnspecified});
}

TEST_F(PrefetchServiceTest, NonDefaultStoragePartition) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());
  test_content_browser_client_->UseOffTheRecordContextForStoragePartition(true);

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  EXPECT_EQ(RequestCount(), 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 0);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(
      serving_page_metrics->prefetch_status.value(),
      static_cast<int>(
          PrefetchStatus::kPrefetchNotEligibleNonDefaultStoragePartition));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs(
      {.eligibility = ToPreloadingEligibility(
           PrefetchStatus::kPrefetchNotEligibleNonDefaultStoragePartition),
       .holdback = PreloadingHoldbackStatus::kUnspecified,
       .outcome = PreloadingTriggeringOutcome::kUnspecified});
}

class PrefetchServiceStreamingURLLoaderTest : public PrefetchServiceTest {
 public:
  void InitScopedFeatureList() override {
    scoped_feature_list_.InitWithFeaturesAndParameters(
        {{features::kPrefetchUseContentRefactor,
          {{"ineligible_decoy_request_probability", "0"},
           {"prefetch_container_lifetime_s", "-1"},
           {"use_streaming_url_loader", "true"}}}},
        {});
  }
};

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_StreamingURLLoaderSuccessCase \
  DISABLED_StreamingURLLoaderSuccessCase
#else
#define MAYBE_StreamingURLLoaderSuccessCase StreamingURLLoaderSuccessCase
#endif
TEST_F(PrefetchServiceStreamingURLLoaderTest,
       MAYBE_StreamingURLLoaderSuccessCase) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});

  // Send the head of the navigation. The prefetch should be servable after this
  // point. The body of the response will be streaming to the serving URL loader
  // as its received.
  SendHeadOfResponseAndWait(net::HTTP_OK, kHTMLMimeType,
                            /*use_prefetch_proxy=*/true,
                            {{"X-Testing", "Hello World"}},
                            std::size(kHTMLBody));

  // Navigate to the URL before the prefetch response is complete.
  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  // Check the metrics while the prefetch is still in progress.
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchNotFinishedInTime));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchNotFinishedInTime);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);
  EXPECT_TRUE(serveable_reader.GetPrefetchContainer()->GetHead());
  EXPECT_TRUE(serveable_reader.GetPrefetchContainer()
                  ->GetHead()
                  ->was_in_prefetch_cache);

  // Send the body and completion status of the request, then recheck all of the
  // metrics.
  SendBodyContentOfResponseAndWait(kHTMLBody);
  CompleteResponseAndWait(net::OK, std::size(kHTMLBody));

  // Check the metrics now that the prefetch is complete.
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  serving_page_metrics = GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);
  ASSERT_TRUE(serveable_reader.GetPrefetchContainer()->GetHead());
  EXPECT_TRUE(serveable_reader.GetPrefetchContainer()
                  ->GetHead()
                  ->was_in_prefetch_cache);

  ExpectCorrectUkmLogs({});
}

class PrefetchServiceNoVarySearchTest : public PrefetchServiceTest {
 public:
  void InitScopedFeatureList() override {
    scoped_feature_list_.InitWithFeatures(
        {network::features::kPrefetchNoVarySearch}, {});
  }
};

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_NoVarySearchSuccessCase DISABLED_NoVarySearchSuccessCase
#else
#define MAYBE_NoVarySearchSuccessCase NoVarySearchSuccessCase
#endif
TEST_F(PrefetchServiceNoVarySearchTest, MAYBE_NoVarySearchSuccessCase) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com/?a=1"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager),
      /*referrer=*/blink::mojom::Referrer(),
      /*enable_no_vary_search_header=*/true);
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com/?a=1"),
                           {.use_prefetch_proxy = true});
  MakeResponseAndWait(
      net::HTTP_OK, net::OK, kHTMLMimeType,
      /*use_prefetch_proxy=*/true,
      {{"X-Testing", "Hello World"}, {"No-Vary-Search", R"(params=("a"))"}},
      kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_EQ(serveable_reader.GetPrefetchContainer()->GetURL(),
            GURL("https://example.com/?a=1"));
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  ExpectCorrectUkmLogs({});
}

class PrefetchServiceAllowRedirectTest : public PrefetchServiceTest {
 public:
  void InitScopedFeatureList() override {
    scoped_feature_list_.InitWithFeaturesAndParameters(
        {{features::kPrefetchUseContentRefactor,
          {{"ineligible_decoy_request_probability", "0"},
           {"prefetch_container_lifetime_s", "-1"}}},
         {features::kPrefetchRedirects, {}}},
        {network::features::kPrefetchNoVarySearch});
  }
};

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_PrefetchEligibleRedirect DISABLED_PrefetchEligibleRedirect
#else
#define MAYBE_PrefetchEligibleRedirect PrefetchEligibleRedirect
#endif
TEST_F(PrefetchServiceAllowRedirectTest, MAYBE_PrefetchEligibleRedirect) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  VerifyFollowRedirectParams(0);

  net::RedirectInfo redirect_info;
  redirect_info.new_method = "GET";
  redirect_info.new_referrer_policy =
      net::ReferrerPolicy::REDUCE_GRANULARITY_ON_TRANSITION_CROSS_ORIGIN;
  redirect_info.new_url = GURL("https://redirect.com");
  MakeSingleRedirectAndWait(
      redirect_info,
      CreateURLResponseHeadForPrefetch(
          net::HTTP_PERMANENT_REDIRECT, kHTMLMimeType,
          /*use_prefetch_proxy=*/true, {}, GURL("https://redirect.com")));
  VerifyFollowRedirectParams(1);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.Result",
      PrefetchRedirectResult::kSuccessRedirectFollowed, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.NetworkContextStateTransition",
      PrefetchRedirectNetworkContextTransition::kIsolatedToIsolated, 1);

  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);
  ASSERT_TRUE(serveable_reader.GetPrefetchContainer()->GetHead());
  EXPECT_TRUE(serveable_reader.GetPrefetchContainer()
                  ->GetHead()
                  ->was_in_prefetch_cache);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.AfterClick.RedirectChainSize", 2, 1);

  ExpectCorrectUkmLogs({});
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_IneligibleRedirectCookies DISABLED_IneligibleRedirectCookies
#else
#define MAYBE_IneligibleRedirectCookies IneligibleRedirectCookies
#endif
TEST_F(PrefetchServiceAllowRedirectTest, MAYBE_IneligibleRedirectCookies) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  ASSERT_TRUE(SetCookie(GURL("https://redirect.com"), "testing"));

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  VerifyFollowRedirectParams(0);

  net::RedirectInfo redirect_info;
  redirect_info.new_method = "GET";
  redirect_info.new_referrer_policy =
      net::ReferrerPolicy::REDUCE_GRANULARITY_ON_TRANSITION_CROSS_ORIGIN;
  redirect_info.new_url = GURL("https://redirect.com");
  MakeSingleRedirectAndWait(
      redirect_info,
      CreateURLResponseHeadForPrefetch(
          net::HTTP_PERMANENT_REDIRECT, kHTMLMimeType,
          /*use_prefetch_proxy=*/true, {}, GURL("https://redirect.com")));

  // Since the redirect URL has cookies, it is ineligible for prefetching and
  // causes the prefetch to fail. Also since checking if the URL has cookies
  // requires mojo, the eligibility check will not complete immediately.
  VerifyFollowRedirectParams(0);

  histogram_tester.ExpectUniqueSample("PrefetchProxy.Redirect.Result",
                                      PrefetchRedirectResult::kFailedIneligible,
                                      1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.NetworkContextStateTransition",
      PrefetchRedirectNetworkContextTransition::kIsolatedToIsolated, 1);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(
      serving_page_metrics->prefetch_status.value(),
      static_cast<int>(PrefetchStatus::kPrefetchFailedIneligibleRedirect));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.AfterClick.RedirectChainSize", 0);

  ExpectCorrectUkmLogs(
      {.outcome = PreloadingTriggeringOutcome::kFailure,
       .failure = ToPreloadingFailureReason(
           PrefetchStatus::kPrefetchFailedIneligibleRedirect)});
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_IneligibleRedirectServiceWorker \
  DISABLED_IneligibleRedirectServiceWorker
#else
#define MAYBE_IneligibleRedirectServiceWorker IneligibleRedirectServiceWorker
#endif
TEST_F(PrefetchServiceAllowRedirectTest,
       MAYBE_IneligibleRedirectServiceWorker) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  service_worker_context_->AddRegistrationToRegisteredStorageKeys(
      blink::StorageKey::CreateFromStringForTesting("https://redirect.com"));
  service_worker_context_->AddServiceWorkerScope(
      GURL("https://redirect.com"),
      ServiceWorkerCapability::SERVICE_WORKER_WITH_FETCH_HANDLER);

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  VerifyFollowRedirectParams(0);

  net::RedirectInfo redirect_info;
  redirect_info.new_method = "GET";
  redirect_info.new_referrer_policy =
      net::ReferrerPolicy::REDUCE_GRANULARITY_ON_TRANSITION_CROSS_ORIGIN;
  redirect_info.new_url = GURL("https://redirect.com");
  MakeSingleRedirectAndWait(
      redirect_info,
      CreateURLResponseHeadForPrefetch(
          net::HTTP_PERMANENT_REDIRECT, kHTMLMimeType,
          /*use_prefetch_proxy=*/true, {}, GURL("https://redirect.com")));

  // Since the redirect URL has cookies, it is ineligible for prefetching and
  // causes the prefetch to fail. Also the eligibility check should fail
  // immediately.
  VerifyFollowRedirectParams(0);

  histogram_tester.ExpectUniqueSample("PrefetchProxy.Redirect.Result",
                                      PrefetchRedirectResult::kFailedIneligible,
                                      1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.NetworkContextStateTransition",
      PrefetchRedirectNetworkContextTransition::kIsolatedToIsolated, 1);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(
      serving_page_metrics->prefetch_status.value(),
      static_cast<int>(PrefetchStatus::kPrefetchFailedIneligibleRedirect));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.AfterClick.RedirectChainSize", 0);

  ExpectCorrectUkmLogs(
      {.outcome = PreloadingTriggeringOutcome::kFailure,
       .failure = ToPreloadingFailureReason(
           PrefetchStatus::kPrefetchFailedIneligibleRedirect)});
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_InvalidRedirect DISABLED_InvalidRedirect
#else
#define MAYBE_InvalidRedirect InvalidRedirect
#endif
TEST_F(PrefetchServiceAllowRedirectTest, MAYBE_InvalidRedirect) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  VerifyFollowRedirectParams(0);

  // The redirect is considered invalid because it has a non-3XX HTTP code.
  net::RedirectInfo redirect_info;
  redirect_info.new_method = "GET";
  redirect_info.new_referrer_policy =
      net::ReferrerPolicy::REDUCE_GRANULARITY_ON_TRANSITION_CROSS_ORIGIN;
  redirect_info.new_url = GURL("https://redirect.com");
  MakeSingleRedirectAndWait(redirect_info, CreateURLResponseHeadForPrefetch(
                                               net::HTTP_OK, kHTMLMimeType,
                                               /*use_prefetch_proxy=*/true, {},
                                               GURL("https://redirect.com")));
  VerifyFollowRedirectParams(0);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.Result",
      PrefetchRedirectResult::kFailedInvalidResponseCode, 1);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Redirect.NetworkContextStateTransition", 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchFailedInvalidRedirect));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.AfterClick.RedirectChainSize", 0);

  ExpectCorrectUkmLogs({.outcome = PreloadingTriggeringOutcome::kFailure,
                        .failure = ToPreloadingFailureReason(
                            PrefetchStatus::kPrefetchFailedInvalidRedirect)});
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_PrefetchSameOriginEligibleRedirect \
  DISABLED_PrefetchSameOriginEligibleRedirect
#else
#define MAYBE_PrefetchSameOriginEligibleRedirect \
  PrefetchSameOriginEligibleRedirect
#endif
TEST_F(PrefetchServiceAllowRedirectTest,
       MAYBE_PrefetchSameOriginEligibleRedirect) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  blink::mojom::Referrer referrer;
  referrer.url = GURL("https://example.com/referrer");
  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/false,
                   blink::mojom::SpeculationEagerness::kEager),
      /*referrer=*/referrer);

  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"));
  VerifyFollowRedirectParams(0);

  net::RedirectInfo redirect_info;
  redirect_info.new_method = "GET";
  redirect_info.new_referrer_policy =
      net::ReferrerPolicy::REDUCE_GRANULARITY_ON_TRANSITION_CROSS_ORIGIN;
  redirect_info.new_url = GURL("https://example.com/redirect");
  MakeSingleRedirectAndWait(redirect_info,
                            CreateURLResponseHeadForPrefetch(
                                net::HTTP_PERMANENT_REDIRECT, kHTMLMimeType,
                                /*use_prefetch_proxy=*/true, {},
                                GURL("https://example.com/redirect")));
  VerifyFollowRedirectParams(1);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.Result",
      PrefetchRedirectResult::kSuccessRedirectFollowed, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.NetworkContextStateTransition",
      PrefetchRedirectNetworkContextTransition::kDefaultToDefault, 1);

  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/false,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_FALSE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);
  ASSERT_TRUE(serveable_reader.GetPrefetchContainer()->GetHead());
  EXPECT_TRUE(serveable_reader.GetPrefetchContainer()
                  ->GetHead()
                  ->was_in_prefetch_cache);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.AfterClick.RedirectChainSize", 2, 1);

  ExpectCorrectUkmLogs({});
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
// TODO(https://crbug.com/1439986): This test is testing the current
// functionality, and should be removed while fixing this bug.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_IneligibleSameSiteCrossOriginRequiresProxyRedirect \
  DISABLED_IneligibleSameSiteCrossOriginRequiresProxyRedirect
#else
#define MAYBE_IneligibleSameSiteCrossOriginRequiresProxyRedirect \
  IneligibleSameSiteCrossOriginRequiresProxyRedirect
#endif
TEST_F(PrefetchServiceAllowRedirectTest,
       MAYBE_IneligibleSameSiteCrossOriginRequiresProxyRedirect) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  blink::mojom::Referrer referrer;
  referrer.url = GURL("https://example.com/referrer");
  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager),
      /*referrer=*/referrer);

  task_environment()->RunUntilIdle();

  // The request to the same-origin prefetch URL should ignore the proxy
  // requirement, since it only applies to cross-origin prefetches.
  VerifyCommonRequestState(GURL("https://example.com"));
  VerifyFollowRedirectParams(0);

  // Redirect to a same-site cross-origin URL. The proxy requirement should
  // apply to this URL, and result in the redirect being marked as ineligible,
  // because we cannot make same-site cross-origin requests that require the
  // proxy.
  net::RedirectInfo redirect_info;
  redirect_info.new_method = "GET";
  redirect_info.new_referrer_policy =
      net::ReferrerPolicy::REDUCE_GRANULARITY_ON_TRANSITION_CROSS_ORIGIN;
  redirect_info.new_url = GURL("https://other.example.com/redirect");
  MakeSingleRedirectAndWait(redirect_info,
                            CreateURLResponseHeadForPrefetch(
                                net::HTTP_PERMANENT_REDIRECT, kHTMLMimeType,
                                /*use_prefetch_proxy=*/true, {},
                                GURL("https://example.com/redirect")));
  VerifyFollowRedirectParams(0);

  histogram_tester.ExpectUniqueSample("PrefetchProxy.Redirect.Result",
                                      PrefetchRedirectResult::kFailedIneligible,
                                      1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.NetworkContextStateTransition",
      PrefetchRedirectNetworkContextTransition::kDefaultToDefault, 1);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(
      serving_page_metrics->prefetch_status.value(),
      static_cast<int>(PrefetchStatus::kPrefetchFailedIneligibleRedirect));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.AfterClick.RedirectChainSize", 0);

  ExpectCorrectUkmLogs(
      {.outcome = PreloadingTriggeringOutcome::kFailure,
       .failure = ToPreloadingFailureReason(
           PrefetchStatus::kPrefetchFailedIneligibleRedirect)});
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_RedirectDefaultToIsolatedNetworkContextTransition \
  DISABLED_RedirectDefaultToIsolatedNetworkContextTransition
#else
#define MAYBE_RedirectDefaultToIsolatedNetworkContextTransition \
  RedirectDefaultToIsolatedNetworkContextTransition
#endif
TEST_F(PrefetchServiceAllowRedirectTest,
       MAYBE_RedirectDefaultToIsolatedNetworkContextTransition) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  blink::mojom::Referrer referrer;
  referrer.url = GURL("https://example.com/referrer");
  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/false,
                   blink::mojom::SpeculationEagerness::kEager),
      /*referrer=*/referrer);
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"));
  VerifyFollowRedirectParams(0);

  net::RedirectInfo redirect_info;
  redirect_info.new_method = "GET";
  redirect_info.new_referrer_policy =
      net::ReferrerPolicy::REDUCE_GRANULARITY_ON_TRANSITION_CROSS_ORIGIN;
  redirect_info.new_url = GURL("https://redirect.com");
  MakeSingleRedirectAndWait(
      redirect_info,
      CreateURLResponseHeadForPrefetch(
          net::HTTP_PERMANENT_REDIRECT, kHTMLMimeType,
          /*use_prefetch_proxy=*/true, {}, GURL("https://redirect.com")));
  task_environment()->RunUntilIdle();

  // Since the redirect is cross-site compared to the referrer. A new request
  // will be started in an isolated network context, and the redirect will not
  // be followed directly.
  VerifyFollowRedirectParams(0);
  ClearCompletedRequests();
  VerifyCommonRequestState(GURL("https://redirect.com"));

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.Result",
      PrefetchRedirectResult::kSuccessRedirectFollowed, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.NetworkContextStateTransition",
      PrefetchRedirectNetworkContextTransition::kDefaultToIsolated, 1);

  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/false,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_FALSE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);
  ASSERT_TRUE(serveable_reader.GetPrefetchContainer()->GetHead());
  EXPECT_TRUE(serveable_reader.GetPrefetchContainer()
                  ->GetHead()
                  ->was_in_prefetch_cache);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.AfterClick.RedirectChainSize", 2, 1);

  ExpectCorrectUkmLogs({});
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_RedirectDefaultToIsolatedNetworkContextTransitionWithProxy \
  DISABLED_RedirectDefaultToIsolatedNetworkContextTransitionWithProxy
#else
#define MAYBE_RedirectDefaultToIsolatedNetworkContextTransitionWithProxy \
  RedirectDefaultToIsolatedNetworkContextTransitionWithProxy
#endif
TEST_F(PrefetchServiceAllowRedirectTest,
       MAYBE_RedirectDefaultToIsolatedNetworkContextTransitionWithProxy) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  blink::mojom::Referrer referrer;
  referrer.url = GURL("https://example.com/referrer");
  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager),
      /*referrer=*/referrer);
  task_environment()->RunUntilIdle();

  // The same-origin request should not use the proxy.
  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = false});
  VerifyFollowRedirectParams(0);

  net::RedirectInfo redirect_info;
  redirect_info.new_method = "GET";
  redirect_info.new_referrer_policy =
      net::ReferrerPolicy::REDUCE_GRANULARITY_ON_TRANSITION_CROSS_ORIGIN;
  redirect_info.new_url = GURL("https://redirect.com");
  MakeSingleRedirectAndWait(
      redirect_info,
      CreateURLResponseHeadForPrefetch(
          net::HTTP_PERMANENT_REDIRECT, kHTMLMimeType,
          /*use_prefetch_proxy=*/true, {}, GURL("https://redirect.com")));
  task_environment()->RunUntilIdle();

  // Since the redirect is cross-site compared to the referrer. A new request
  // will be started in an isolated network context, and the redirect will not
  // be followed directly. The new request should use the proxy.
  VerifyFollowRedirectParams(0);
  ClearCompletedRequests();
  VerifyCommonRequestState(GURL("https://redirect.com"),
                           {.use_prefetch_proxy = true});

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.Result",
      PrefetchRedirectResult::kSuccessRedirectFollowed, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.NetworkContextStateTransition",
      PrefetchRedirectNetworkContextTransition::kDefaultToIsolated, 1);

  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/false,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);
  ASSERT_TRUE(serveable_reader.GetPrefetchContainer()->GetHead());
  EXPECT_TRUE(serveable_reader.GetPrefetchContainer()
                  ->GetHead()
                  ->was_in_prefetch_cache);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.AfterClick.RedirectChainSize", 2, 1);

  ExpectCorrectUkmLogs({});
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_RedirectIsolatedToDefaultNetworkContextTransition \
  DISABLED_RedirectIsolatedToDefaultNetworkContextTransition
#else
#define MAYBE_RedirectIsolatedToDefaultNetworkContextTransition \
  RedirectIsolatedToDefaultNetworkContextTransition
#endif
TEST_F(PrefetchServiceAllowRedirectTest,
       MAYBE_RedirectIsolatedToDefaultNetworkContextTransition) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  blink::mojom::Referrer referrer;
  referrer.url = GURL("https://example.com/referrer");
  MakePrefetchOnMainFrame(
      GURL("https://other.com"),
      PrefetchType(/*use_prefetch_proxy=*/false,
                   blink::mojom::SpeculationEagerness::kEager),
      /*referrer=*/referrer);
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://other.com"),
                           {.use_prefetch_proxy = false});
  VerifyFollowRedirectParams(0);

  net::RedirectInfo redirect_info;
  redirect_info.new_method = "GET";
  redirect_info.new_referrer_policy =
      net::ReferrerPolicy::REDUCE_GRANULARITY_ON_TRANSITION_CROSS_ORIGIN;
  redirect_info.new_url = GURL("https://example.com/redirect");
  MakeSingleRedirectAndWait(redirect_info,
                            CreateURLResponseHeadForPrefetch(
                                net::HTTP_PERMANENT_REDIRECT, kHTMLMimeType,
                                /*use_prefetch_proxy=*/true, {},
                                GURL("https://example.com/redirect")));
  task_environment()->RunUntilIdle();

  // Since the redirect is same-site compared to the referrer. A new request
  // will be started in the default network context, and the redirect will not
  // be followed directly.
  VerifyFollowRedirectParams(0);
  ClearCompletedRequests();
  VerifyCommonRequestState(GURL("https://example.com/redirect"),
                           {.use_prefetch_proxy = false});

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.Result",
      PrefetchRedirectResult::kSuccessRedirectFollowed, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.NetworkContextStateTransition",
      PrefetchRedirectNetworkContextTransition::kIsolatedToDefault, 1);

  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/false,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  Navigate(GURL("https://other.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_FALSE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://other.com"));
  ASSERT_TRUE(serveable_reader);
  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);
  ASSERT_TRUE(serveable_reader.GetPrefetchContainer()->GetHead());
  EXPECT_TRUE(serveable_reader.GetPrefetchContainer()
                  ->GetHead()
                  ->was_in_prefetch_cache);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.AfterClick.RedirectChainSize", 2, 1);

  ExpectCorrectUkmLogs({});
}

class PrefetchServiceAllowRedirectsAndAlwaysBlockUntilHeadTest
    : public PrefetchServiceTest {
 public:
  void InitScopedFeatureList() override {
    scoped_feature_list_.InitWithFeaturesAndParameters(
        {{features::kPrefetchUseContentRefactor,
          {{"ineligible_decoy_request_probability", "0"},
           {"prefetch_container_lifetime_s", "-1"},
           {"block_until_head_eager_prefetch", "true"},
           {"block_until_head_moderate_prefetch", "true"},
           {"block_until_head_conservative_prefetch", "true"}}},
         {features::kPrefetchRedirects, {}}},
        {network::features::kPrefetchNoVarySearch});
  }
};

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_RedirectNetworkContextTransitionBlockUntilHead \
  DISABLED_RedirectNetworkContextTransitionBlockUntilHead
#else
#define MAYBE_RedirectNetworkContextTransitionBlockUntilHead \
  RedirectNetworkContextTransitionBlockUntilHead
#endif
TEST_F(PrefetchServiceAllowRedirectsAndAlwaysBlockUntilHeadTest,
       MAYBE_RedirectNetworkContextTransitionBlockUntilHead) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  blink::mojom::Referrer referrer;
  referrer.url = GURL("https://example.com/referrer");
  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/false,
                   blink::mojom::SpeculationEagerness::kEager),
      /*referrer=*/referrer);
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"));
  VerifyFollowRedirectParams(0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  // Request the prefetch from the PrefetchService. The given callback shouldn't
  // be called until after the head is received.
  base::test::TestFuture<PrefetchContainer::Reader> future;
  GetPrefetchToServe(future, GURL("https://example.com"),
                     main_rfh()->GetGlobalId());
  EXPECT_FALSE(future.IsReady());

  net::RedirectInfo redirect_info;
  redirect_info.new_method = "GET";
  redirect_info.new_referrer_policy =
      net::ReferrerPolicy::REDUCE_GRANULARITY_ON_TRANSITION_CROSS_ORIGIN;
  redirect_info.new_url = GURL("https://redirect.com");
  MakeSingleRedirectAndWait(
      redirect_info,
      CreateURLResponseHeadForPrefetch(
          net::HTTP_PERMANENT_REDIRECT, kHTMLMimeType,
          /*use_prefetch_proxy=*/true, {}, GURL("https://redirect.com")));
  task_environment()->RunUntilIdle();

  // Since the redirect is cross-site compared to the referrer. A new request
  // will be started in an isolated network context, and the redirect will not
  // be followed directly.
  VerifyFollowRedirectParams(0);
  ClearCompletedRequests();
  VerifyCommonRequestState(GURL("https://redirect.com"));

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.Result",
      PrefetchRedirectResult::kSuccessRedirectFollowed, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.NetworkContextStateTransition",
      PrefetchRedirectNetworkContextTransition::kDefaultToIsolated, 1);

  // Once the final response to the prefetch is received, then callback given to
  // |GetPrefetchToServe| should be run.
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/false,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);
  PrefetchContainer::Reader serveable_reader = future.Take();
  ASSERT_TRUE(serveable_reader);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_FALSE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);
  ASSERT_TRUE(serveable_reader.GetPrefetchContainer()->GetHead());
  EXPECT_TRUE(serveable_reader.GetPrefetchContainer()
                  ->GetHead()
                  ->was_in_prefetch_cache);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.AfterClick.RedirectChainSize", 2, 1);

  ExpectCorrectUkmLogs({});
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_RedirectInsufficientReferrerPolicy \
  DISABLED_RedirectInsufficientReferrerPolicy
#else
#define MAYBE_RedirectInsufficientReferrerPolicy \
  RedirectInsufficientReferrerPolicy
#endif
TEST_F(PrefetchServiceAllowRedirectTest,
       MAYBE_RedirectInsufficientReferrerPolicy) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  blink::mojom::Referrer referrer;
  referrer.url = GURL("https://referrer.com");
  referrer.policy = network::mojom::ReferrerPolicy::kDefault;
  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager),
      /*referrer=*/referrer);
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});
  VerifyFollowRedirectParams(0);

  // Redirect to a different site. This will check the referrer policy, but
  // since it is not sufficiently strict, the redirect should fail.
  net::RedirectInfo redirect_info;
  redirect_info.new_method = "GET";
  redirect_info.new_referrer_policy = net::ReferrerPolicy::NEVER_CLEAR;
  redirect_info.new_url = GURL("https://redirect.com");
  MakeSingleRedirectAndWait(
      redirect_info,
      CreateURLResponseHeadForPrefetch(
          net::HTTP_PERMANENT_REDIRECT, kHTMLMimeType,
          /*use_prefetch_proxy=*/true, {}, GURL("https://redirect.com")));
  VerifyFollowRedirectParams(0);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Redirect.Result",
      PrefetchRedirectResult::kFailedInsufficientReferrerPolicy, 1);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Redirect.NetworkContextStateTransition", 0);

  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchFailedInvalidRedirect));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.AfterClick.RedirectChainSize", 0);

  ExpectCorrectUkmLogs({.outcome = PreloadingTriggeringOutcome::kFailure,
                        .failure = ToPreloadingFailureReason(
                            PrefetchStatus::kPrefetchFailedInvalidRedirect)});
}

class PrefetchServiceNeverBlockUntilHeadTest : public PrefetchServiceTest {
 public:
  void InitScopedFeatureList() override {
    scoped_feature_list_.InitWithFeaturesAndParameters(
        {{features::kPrefetchUseContentRefactor,
          {{"ineligible_decoy_request_probability", "0"},
           {"prefetch_container_lifetime_s", "-1"},
           {"block_until_head_eager_prefetch", "false"},
           {"block_until_head_moderate_prefetch", "false"},
           {"block_until_head_conservative_prefetch", "false"}}}},
        {network::features::kPrefetchNoVarySearch});
  }
};

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_HeadNotReceived DISABLED_HeadNotReceived
#else
#define MAYBE_HeadNotReceived HeadNotReceived
#endif
TEST_F(PrefetchServiceNeverBlockUntilHeadTest, MAYBE_HeadNotReceived) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true,
                   blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(GURL("https://example.com"),
                           {.use_prefetch_proxy = true});

  // Navigate to the URL before the head of the prefetch response is received.
  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  // Since PrefetchService cannot block until headers for this prefetch, it
  // should immediately return null.
  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com"));
  EXPECT_FALSE(serveable_reader);

  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchNotFinishedInTime));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  ExpectCorrectUkmLogs({.outcome = PreloadingTriggeringOutcome::kRunning});
}

class PrefetchServiceAlwaysBlockUntilHeadTest
    : public PrefetchServiceTest,
      public ::testing::WithParamInterface<blink::mojom::SpeculationEagerness> {
 public:
  const int kPrefetchTimeout = 10000;
  void InitScopedFeatureList() override {
    scoped_feature_list_.InitWithFeaturesAndParameters(
        {{features::kPrefetchUseContentRefactor,
          {
              {"ineligible_decoy_request_probability", "0"},
              {"prefetch_container_lifetime_s", "-1"},
              {"prefetch_timeout_ms", "10000"},
              {"block_until_head_eager_prefetch", "true"},
              {"block_until_head_moderate_prefetch", "true"},
              {"block_until_head_conservative_prefetch", "true"},
              // Initialize timeouts > 0ms for testing purposes.
              {"block_until_head_timeout_eager_prefetch", "1000"},
              {"block_until_head_timeout_moderate_prefetch", "1000"},
              {"block_until_head_timeout_conservative_prefetch", "1000"},
          }}},
        {network::features::kPrefetchNoVarySearch});
  }
};

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_BlockUntilHeadReceived DISABLED_BlockUntilHeadReceived
#else
#define MAYBE_BlockUntilHeadReceived BlockUntilHeadReceived
#endif
TEST_P(PrefetchServiceAlwaysBlockUntilHeadTest, MAYBE_BlockUntilHeadReceived) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true, GetParam()));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(
      GURL("https://example.com"),
      {.use_prefetch_proxy = true,
       .expected_priority = ExpectedPriorityForEagerness(GetParam())});

  // Navigate to the URL before the head of the prefetch response is received
  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  // Request the prefetch from the PrefetchService. The given callback shouldn't
  // be called until after the head is received.
  base::test::TestFuture<PrefetchContainer::Reader> future;
  GetPrefetchToServe(future, GURL("https://example.com"),
                     main_rfh()->GetGlobalId());
  EXPECT_FALSE(future.IsReady());

  task_environment()->FastForwardBy(base::Milliseconds(500));

  // Sends the head of the prefetch response. This should trigger the above
  // callback.
  SendHeadOfResponseAndWait(net::HTTP_OK, kHTMLMimeType,
                            /*use_prefetch_proxy=*/true,
                            {{"X-Testing", "Hello World"}},
                            std::size(kHTMLBody));
  PrefetchContainer::Reader serveable_reader = future.Take();
  ASSERT_TRUE(serveable_reader);

  // Send the body and completion status of the request,
  SendBodyContentOfResponseAndWait(kHTMLBody);
  CompleteResponseAndWait(net::OK, std::size(kHTMLBody));

  // Check the metrics now that the prefetch is complete.
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);
  ASSERT_TRUE(serveable_reader.GetPrefetchContainer()->GetHead());
  EXPECT_TRUE(serveable_reader.GetPrefetchContainer()
                  ->GetHead()
                  ->was_in_prefetch_cache);

  ExpectCorrectUkmLogs({.eagerness = GetParam()});

  std::string histogram_suffix =
      GetPrefetchEagernessHistogramSuffix(GetParam());
  histogram_tester.ExpectUniqueTimeSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.BlockUntilHeadDuration.Served.%s",
          histogram_suffix.c_str()),
      base::Milliseconds(500), 1);
  histogram_tester.ExpectUniqueSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.WasBlockedUntilHeadWhenServing.%s",
          histogram_suffix.c_str()),
      true, 1);
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_NVSBlockUntilHeadReceived DISABLED_NVSBlockUntilHeadReceived
#else
#define MAYBE_NVSBlockUntilHeadReceived NVSBlockUntilHeadReceived
#endif
TEST_P(PrefetchServiceAlwaysBlockUntilHeadTest,
       MAYBE_NVSBlockUntilHeadReceived) {
  // For this test we need to enable kPrefetchNoVarySearch.
  base::test::ScopedFeatureList feature_list;
  feature_list.InitWithFeatures({network::features::kPrefetchNoVarySearch}, {});
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  network::mojom::NoVarySearchPtr no_vary_search_hint =
      network::mojom::NoVarySearch::New();
  no_vary_search_hint->vary_on_key_order = true;
  no_vary_search_hint->search_variance =
      network::mojom::SearchParamsVariance::NewNoVaryParams(
          std::vector<std::string>({"a"}));
  MakePrefetchOnMainFrame(
      GURL("https://example.com/index.html?a=5"),
      PrefetchType(/*use_prefetch_proxy=*/true, GetParam()),
      /* referrer */ blink::mojom::Referrer(),
      /* no_vary_search_support */ true,
      /* no_vary_search_hint */ std::move(no_vary_search_hint));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(
      GURL("https://example.com/index.html?a=5"),
      {.use_prefetch_proxy = true,
       .expected_priority = ExpectedPriorityForEagerness(GetParam())});

  // Navigate to the URL before the head of the prefetch response is received
  Navigate(GURL("https://example.com/index.html"), main_rfh()->GetFrameToken());

  // Request the prefetch from the PrefetchService. The given callback shouldn't
  // be called until after the head is received.
  base::test::TestFuture<PrefetchContainer::Reader> future;
  GetPrefetchToServe(future, GURL("https://example.com/index.html"),
                     main_rfh()->GetGlobalId());
  EXPECT_FALSE(future.IsReady());
  task_environment()->FastForwardBy(base::Milliseconds(600));

  // Sends the head of the prefetch response. This should trigger the above
  // callback.
  SendHeadOfResponseAndWait(
      net::HTTP_OK, kHTMLMimeType,
      /*use_prefetch_proxy=*/true,
      {{"X-Testing", "Hello World"}, {"No-Vary-Search", "params=(\"a\")"}},
      std::size(kHTMLBody));
  PrefetchContainer::Reader serveable_reader = future.Take();
  ASSERT_TRUE(serveable_reader);

  // Send the body and completion status of the request,
  SendBodyContentOfResponseAndWait(kHTMLBody);
  CompleteResponseAndWait(net::OK, std::size(kHTMLBody));

  // Check the metrics now that the prefetch is complete.
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  EXPECT_TRUE(serveable_reader.HasPrefetchStatus());
  EXPECT_EQ(serveable_reader.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_EQ(serveable_reader.GetServableState(base::TimeDelta::Max()),
            PrefetchContainer::ServableState::kServable);
  ASSERT_TRUE(serveable_reader.GetPrefetchContainer()->GetHead());
  EXPECT_TRUE(serveable_reader.GetPrefetchContainer()
                  ->GetHead()
                  ->was_in_prefetch_cache);

  ExpectCorrectUkmLogs({.is_accurate = true, .eagerness = GetParam()});

  std::string histogram_suffix =
      GetPrefetchEagernessHistogramSuffix(GetParam());
  histogram_tester.ExpectUniqueTimeSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.BlockUntilHeadDuration.Served.%s",
          histogram_suffix.c_str()),
      base::Milliseconds(600), 1);
  histogram_tester.ExpectUniqueSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.WasBlockedUntilHeadWhenServing.%s",
          histogram_suffix.c_str()),
      true, 1);
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_NVSBlockUntilHeadReceivedNoMatchNoNVSHeader \
  DISABLED_NVSBlockUntilHeadReceivedNoMatchNoNVSHeader
#else
#define MAYBE_NVSBlockUntilHeadReceivedNoMatchNoNVSHeader \
  NVSBlockUntilHeadReceivedNoMatchNoMatchNoNVSHeader
#endif
TEST_P(PrefetchServiceAlwaysBlockUntilHeadTest,
       MAYBE_NVSBlockUntilHeadReceivedNoMatchNoNVSHeader) {
  // For this test we need to enable kPrefetchNoVarySearch.
  base::test::ScopedFeatureList feature_list;
  feature_list.InitWithFeatures({network::features::kPrefetchNoVarySearch}, {});
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  network::mojom::NoVarySearchPtr no_vary_search_hint =
      network::mojom::NoVarySearch::New();
  no_vary_search_hint->vary_on_key_order = true;
  no_vary_search_hint->search_variance =
      network::mojom::SearchParamsVariance::NewNoVaryParams(
          std::vector<std::string>({"a"}));
  MakePrefetchOnMainFrame(
      GURL("https://example.com/index.html?a=5"),
      PrefetchType(/*use_prefetch_proxy=*/true, GetParam()),
      /* referrer */ blink::mojom::Referrer(),
      /* no_vary_search_support */ true,
      /* no_vary_search_hint */ std::move(no_vary_search_hint));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(
      GURL("https://example.com/index.html?a=5"),
      {.use_prefetch_proxy = true,
       .expected_priority = ExpectedPriorityForEagerness(GetParam())});

  // Navigate to the URL before the head of the prefetch response is received
  Navigate(GURL("https://example.com/index.html"), main_rfh()->GetFrameToken());

  // Request the prefetch from the PrefetchService. The given callback shouldn't
  // be called until after the head is received.
  base::test::TestFuture<PrefetchContainer::Reader> future;
  GetPrefetchToServe(future, GURL("https://example.com/index.html"),
                     main_rfh()->GetGlobalId());
  EXPECT_FALSE(future.IsReady());

  task_environment()->FastForwardBy(base::Milliseconds(700));

  // Sends the head of the prefetch response. This should trigger the above
  // callback with a nullptr argument.
  SendHeadOfResponseAndWait(net::HTTP_OK, kHTMLMimeType,
                            /*use_prefetch_proxy=*/true,
                            {{"X-Testing", "Hello World"}},
                            std::size(kHTMLBody));
  PrefetchContainer::Reader serveable_reader = future.Take();
  ASSERT_FALSE(serveable_reader);

  // Send the body and completion status of the request,
  SendBodyContentOfResponseAndWait(kHTMLBody);
  CompleteResponseAndWait(net::OK, std::size(kHTMLBody));

  // Check the metrics now that the prefetch is complete.
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);

  EXPECT_TRUE(serving_page_metrics->prefetch_status);

  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  ExpectCorrectUkmLogs({.eagerness = GetParam()});

  std::string histogram_suffix =
      GetPrefetchEagernessHistogramSuffix(GetParam());
  histogram_tester.ExpectUniqueTimeSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.BlockUntilHeadDuration.NotServed.%s",
          histogram_suffix.c_str()),
      base::Milliseconds(700), 1);
  histogram_tester.ExpectUniqueSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.WasBlockedUntilHeadWhenServing.%s",
          histogram_suffix.c_str()),
      true, 1);
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_NVSBlockUntilHeadReceivedNoMatchByNVSHeader \
  DISABLED_NVSBlockUntilHeadReceivedNoMatchByNVSHeader
#else
#define MAYBE_NVSBlockUntilHeadReceivedNoMatchByNVSHeader \
  NVSBlockUntilHeadReceivedNoMatchNoMatchByNVSHeader
#endif
TEST_P(PrefetchServiceAlwaysBlockUntilHeadTest,
       MAYBE_NVSBlockUntilHeadReceivedNoMatchByNVSHeader) {
  // For this test we need to enable kPrefetchNoVarySearch.
  base::test::ScopedFeatureList feature_list;
  feature_list.InitWithFeatures({network::features::kPrefetchNoVarySearch}, {});
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  network::mojom::NoVarySearchPtr no_vary_search_hint =
      network::mojom::NoVarySearch::New();
  no_vary_search_hint->vary_on_key_order = true;
  no_vary_search_hint->search_variance =
      network::mojom::SearchParamsVariance::NewNoVaryParams(
          std::vector<std::string>({"a"}));
  MakePrefetchOnMainFrame(
      GURL("https://example.com/index.html?a=5"),
      PrefetchType(/*use_prefetch_proxy=*/true, GetParam()),
      /* referrer */ blink::mojom::Referrer(),
      /* no_vary_search_support */ true,
      /* no_vary_search_hint */ std::move(no_vary_search_hint));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(
      GURL("https://example.com/index.html?a=5"),
      {.use_prefetch_proxy = true,
       .expected_priority = ExpectedPriorityForEagerness(GetParam())});

  // Navigate to the URL before the head of the prefetch response is received
  Navigate(GURL("https://example.com/index.html"), main_rfh()->GetFrameToken());

  // Request the prefetch from the PrefetchService. The given callback shouldn't
  // be called until after the head is received.
  base::test::TestFuture<PrefetchContainer::Reader> future;
  GetPrefetchToServe(future, GURL("https://example.com/index.html"),
                     main_rfh()->GetGlobalId());
  EXPECT_FALSE(future.IsReady());

  task_environment()->FastForwardBy(base::Milliseconds(kHeaderLatency));

  // Sends the head of the prefetch response. This should trigger the above
  // callback with a nullptr argument.
  SendHeadOfResponseAndWait(
      net::HTTP_OK, kHTMLMimeType,
      /*use_prefetch_proxy=*/true,
      {{"X-Testing", "Hello World"}, {"No-Vary-Search", "params=(\"b\")"}},
      std::size(kHTMLBody));
  PrefetchContainer::Reader serveable_reader = future.Take();
  ASSERT_FALSE(serveable_reader);

  // Send the body and completion status of the request,
  SendBodyContentOfResponseAndWait(kHTMLBody);
  CompleteResponseAndWait(net::OK, std::size(kHTMLBody));

  // Check the metrics now that the prefetch is complete.
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);

  EXPECT_TRUE(serving_page_metrics->prefetch_status);

  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  ExpectCorrectUkmLogs({.eagerness = GetParam()});

  std::string histogram_suffix =
      GetPrefetchEagernessHistogramSuffix(GetParam());
  histogram_tester.ExpectUniqueTimeSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.BlockUntilHeadDuration.NotServed.%s",
          histogram_suffix.c_str()),
      base::Milliseconds(kHeaderLatency), 1);
  histogram_tester.ExpectUniqueSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.WasBlockedUntilHeadWhenServing.%s",
          histogram_suffix.c_str()),
      true, 1);
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_FailedCookiesChangedWhileBlockUntilHead \
  DISABLED_FailedCookiesChangedWhileBlockUntilHead
#else
#define MAYBE_FailedCookiesChangedWhileBlockUntilHead \
  FailedCookiesChangedWhileBlockUntilHead
#endif
TEST_P(PrefetchServiceAlwaysBlockUntilHeadTest,
       MAYBE_FailedCookiesChangedWhileBlockUntilHead) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true, GetParam()));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(
      GURL("https://example.com"),
      {.use_prefetch_proxy = true,
       .expected_priority = ExpectedPriorityForEagerness(GetParam())});

  // Navigate to the URL before the head of the prefetch response is received
  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  // Request the prefetch from the PrefetchService. The given callback shouldn't
  // be called until after the head is received.
  base::test::TestFuture<PrefetchContainer::Reader> future;
  GetPrefetchToServe(future, GURL("https://example.com"),
                     main_rfh()->GetGlobalId());
  EXPECT_FALSE(future.IsReady());

  task_environment()->FastForwardBy(base::Milliseconds(800));

  // Adding a cookie after while blocking until the head is received will cause
  // it to fail.
  ASSERT_TRUE(SetCookie(GURL("https://example.com"), "testing"));
  task_environment()->RunUntilIdle();

  // Sends the head of the prefetch response. This should trigger the above
  // callback.
  SendHeadOfResponseAndWait(net::HTTP_OK, kHTMLMimeType,
                            /*use_prefetch_proxy=*/true,
                            {{"X-Testing", "Hello World"}},
                            std::size(kHTMLBody));
  PrefetchContainer::Reader serveable_reader = future.Take();
  EXPECT_FALSE(serveable_reader);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.NetError",
                                    0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchNotUsedCookiesChanged));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  ExpectCorrectUkmLogs({.outcome = PreloadingTriggeringOutcome::kFailure,
                        .failure = ToPreloadingFailureReason(
                            PrefetchStatus::kPrefetchNotUsedCookiesChanged),
                        .eagerness = GetParam()});

  std::string histogram_suffix =
      GetPrefetchEagernessHistogramSuffix(GetParam());
  histogram_tester.ExpectUniqueTimeSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.BlockUntilHeadDuration.NotServed.%s",
          histogram_suffix.c_str()),
      base::Milliseconds(800), 1);
  histogram_tester.ExpectUniqueSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.WasBlockedUntilHeadWhenServing.%s",
          histogram_suffix.c_str()),
      true, 1);
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_FailedTimeoutWhileBlockUntilHead \
  DISABLED_FailedTimeoutWhileBlockUntilHead
#else
#define MAYBE_FailedTimeoutWhileBlockUntilHead FailedTimeoutWhileBlockUntilHead
#endif
TEST_P(PrefetchServiceAlwaysBlockUntilHeadTest,
       MAYBE_FailedTimeoutWhileBlockUntilHead) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true, GetParam()));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(
      GURL("https://example.com"),
      {.use_prefetch_proxy = true,
       .expected_priority = ExpectedPriorityForEagerness(GetParam())});

  // Navigate to the URL before the head of the prefetch response is received
  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  // Request the prefetch from the PrefetchService. The given callback shouldn't
  // be called until after the head is received.
  base::test::TestFuture<PrefetchContainer::Reader> future;
  GetPrefetchToServe(future, GURL("https://example.com"),
                     main_rfh()->GetGlobalId());
  EXPECT_FALSE(future.IsReady());

  // If the prefetch times out while PrefetchService is blocking until head,
  // then it should unblock without setting serveable_reader.
  task_environment()->FastForwardBy(base::Milliseconds(kPrefetchTimeout));
  PrefetchContainer::Reader serveable_reader = future.Take();
  EXPECT_FALSE(serveable_reader);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 1);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", std::abs(net::ERR_TIMED_OUT),
      1);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchFailedNetError));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  ExpectCorrectUkmLogs({.outcome = PreloadingTriggeringOutcome::kFailure,
                        .failure = ToPreloadingFailureReason(
                            PrefetchStatus::kPrefetchFailedNetError),
                        .eagerness = GetParam()});

  std::string histogram_suffix =
      GetPrefetchEagernessHistogramSuffix(GetParam());
  base::TimeDelta block_until_head_timeout =
      PrefetchBlockUntilHeadTimeout(GetParam());
  histogram_tester.ExpectUniqueTimeSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.BlockUntilHeadDuration.NotServed.%s",
          histogram_suffix.c_str()),
      block_until_head_timeout, 1);
  histogram_tester.ExpectUniqueSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.WasBlockedUntilHeadWhenServing.%s",
          histogram_suffix.c_str()),
      true, 1);
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_FailedTimeoutWhileBlockUntilHeadForOlderNavigation \
  DISABLED_FailedTimeoutWhileBlockUntilHeadForOlderNavigation
#else
#define MAYBE_FailedTimeoutWhileBlockUntilHeadForOlderNavigation \
  FailedTimeoutWhileBlockUntilHeadForOlderNavigation
#endif
TEST_P(PrefetchServiceAlwaysBlockUntilHeadTest,
       MAYBE_FailedTimeoutWhileBlockUntilHeadForOlderNavigation) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/false, GetParam()));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(
      GURL("https://example.com"),
      {.expected_priority = ExpectedPriorityForEagerness(GetParam())});

  // Navigate to the URL before the head of the prefetch response is received
  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  // Request the prefetch from the PrefetchService. The given callback shouldn't
  // be called until after the head is received.
  base::RunLoop get_prefetch_run_loop;
  PrefetchContainer::Reader serveable_reader;
  PrefetchMatchResolver* prefetch_match_resolver =
      GetPrefetchMatchResolverForMostRecentNavigation();
  bool first_nav_callback_called = false;
  prefetch_match_resolver->SetOnPrefetchToServeReadyCallback(
      base::BindLambdaForTesting(
          [&serveable_reader, &first_nav_callback_called,
           &get_prefetch_run_loop](
              PrefetchContainer::Reader prefetch_to_serve) {
            serveable_reader = std::move(prefetch_to_serve);
            first_nav_callback_called = true;
            get_prefetch_run_loop.Quit();
          }));
  prefetch_service_->GetPrefetchToServe(
      PrefetchContainer::Key(main_rfh()->GetGlobalId(),
                             GURL("https://example.com")),
      *prefetch_match_resolver);
  EXPECT_FALSE(serveable_reader);

  // Navigate to the URL again before the head of the prefetch response is
  // received
  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  // If the prefetch times out while PrefetchService is blocking until head,
  // then it should unblock without setting serveable_reader.
  task_environment()->FastForwardBy(base::Milliseconds(kPrefetchTimeout));

  bool second_nav_callback_called = false;
  prefetch_match_resolver = GetPrefetchMatchResolverForMostRecentNavigation();
  prefetch_match_resolver->SetOnPrefetchToServeReadyCallback(
      base::BindLambdaForTesting(
          [&serveable_reader, &get_prefetch_run_loop,
           &second_nav_callback_called](
              PrefetchContainer::Reader prefetch_to_serve) {
            second_nav_callback_called = true;
            serveable_reader = std::move(prefetch_to_serve);
            get_prefetch_run_loop.Quit();
          }));
  prefetch_service_->GetPrefetchToServe(
      PrefetchContainer::Key(main_rfh()->GetGlobalId(),
                             GURL("https://example.com")),
      *prefetch_match_resolver);

  get_prefetch_run_loop.Run();
  EXPECT_FALSE(serveable_reader);
  EXPECT_FALSE(first_nav_callback_called);
  EXPECT_TRUE(second_nav_callback_called);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 1);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", std::abs(net::ERR_TIMED_OUT),
      1);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchFailedNetError));
  EXPECT_FALSE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  ExpectCorrectUkmLogs({.outcome = PreloadingTriggeringOutcome::kFailure,
                        .failure = ToPreloadingFailureReason(
                            PrefetchStatus::kPrefetchFailedNetError),
                        .eagerness = GetParam()});

  std::string histogram_suffix =
      GetPrefetchEagernessHistogramSuffix(GetParam());
  histogram_tester.ExpectUniqueTimeSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.BlockUntilHeadDuration.NotServed.%s",
          histogram_suffix.c_str()),
      base::Milliseconds(kPrefetchTimeout), 1);
  histogram_tester.ExpectUniqueSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.WasBlockedUntilHeadWhenServing.%s",
          histogram_suffix.c_str()),
      true, 1);
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_FailedNetErrorWhileBlockUntilHead \
  DISABLED_FailedNetErrorWhileBlockUntilHead
#else
#define MAYBE_FailedNetErrorWhileBlockUntilHead \
  FailedNetErrorWhileBlockUntilHead
#endif
TEST_P(PrefetchServiceAlwaysBlockUntilHeadTest,
       MAYBE_FailedNetErrorWhileBlockUntilHead) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/false, GetParam()));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(
      GURL("https://example.com"),
      {.expected_priority = ExpectedPriorityForEagerness(GetParam())});

  // Navigate to the URL before the head of the prefetch response is received
  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  // Request the prefetch from the PrefetchService. The given callback shouldn't
  // be called until after the head is received.
  base::test::TestFuture<PrefetchContainer::Reader> future;
  GetPrefetchToServe(future, GURL("https://example.com"),
                     main_rfh()->GetGlobalId());
  EXPECT_FALSE(future.IsReady());

  task_environment()->FastForwardBy(base::Milliseconds(300));

  // If the prefetch encounters a net error while PrefetchService is blocking
  // until head, then it should unblock without setting
  // serveable_reader.
  CompleteResponseAndWait(net::ERR_ACCESS_DENIED, 0);
  PrefetchContainer::Reader serveable_reader = future.Take();
  EXPECT_FALSE(serveable_reader);

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 1);
  histogram_tester.ExpectTotalCount("PrefetchProxy.Prefetch.Mainframe.RespCode",
                                    0);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError",
      std::abs(net::ERR_ACCESS_DENIED), 1);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", 0);
  histogram_tester.ExpectTotalCount(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", 0);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchFailedNetError));
  EXPECT_FALSE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);

  ExpectCorrectUkmLogs({.outcome = PreloadingTriggeringOutcome::kFailure,
                        .failure = ToPreloadingFailureReason(
                            PrefetchStatus::kPrefetchFailedNetError),
                        .eagerness = GetParam()});

  std::string histogram_suffix =
      GetPrefetchEagernessHistogramSuffix(GetParam());
  histogram_tester.ExpectUniqueTimeSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.BlockUntilHeadDuration.NotServed.%s",
          histogram_suffix.c_str()),
      base::Milliseconds(300), 1);
  histogram_tester.ExpectUniqueSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.WasBlockedUntilHeadWhenServing.%s",
          histogram_suffix.c_str()),
      true, 1);
}

INSTANTIATE_TEST_SUITE_P(
    ParametrizedTests,
    PrefetchServiceAlwaysBlockUntilHeadTest,
    testing::Values(blink::mojom::SpeculationEagerness::kModerate,
                    blink::mojom::SpeculationEagerness::kConservative));

class PrefetchServiceAlwaysBlockUntilHeadWithTimeoutTest
    : public PrefetchServiceTest,
      public ::testing::WithParamInterface<blink::mojom::SpeculationEagerness> {
 public:
  void InitScopedFeatureList() override {
    scoped_feature_list_.InitWithFeaturesAndParameters(
        {{features::kPrefetchUseContentRefactor,
          {
              {"ineligible_decoy_request_probability", "0"},
              {"prefetch_container_lifetime_s", "-1"},
              {"prefetch_timeout_ms", "10000"},
              {"block_until_head_eager_prefetch", "true"},
              {"block_until_head_moderate_prefetch", "true"},
              {"block_until_head_conservative_prefetch", "true"},
              {"block_until_head_timeout_eager_prefetch", "1000"},
              {"block_until_head_timeout_moderate_prefetch", "1000"},
              {"block_until_head_timeout_conservative_prefetch", "1000"},
          }}},
        {network::features::kPrefetchNoVarySearch});
  }
};

#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_BlockUntilHeadTimedout DISABLED_BlockUntilHeadTimedout
#else
#define MAYBE_BlockUntilHeadTimedout BlockUntilHeadTimedout
#endif
TEST_P(PrefetchServiceAlwaysBlockUntilHeadWithTimeoutTest,
       MAYBE_BlockUntilHeadTimedout) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true, GetParam()));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(
      GURL("https://example.com"),
      {.use_prefetch_proxy = true,
       .expected_priority = ExpectedPriorityForEagerness(GetParam())});

  // Navigate to the URL before the head of the prefetch response is received
  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  // Request the prefetch from the PrefetchService. The given callback should be
  // triggered once the timeout is exceeded.
  base::test::TestFuture<PrefetchContainer::Reader> future;
  GetPrefetchToServe(future, GURL("https://example.com"),
                     main_rfh()->GetGlobalId());
  EXPECT_FALSE(future.IsReady());

  task_environment()->FastForwardBy(base::Milliseconds(1000));
  PrefetchContainer::Reader serveable_reader = future.Take();
  EXPECT_FALSE(serveable_reader);

  // If the prefetch is received after the block until head has timed out, it
  // will not be used.
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  // Check the metrics now that the prefetch is complete.
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs({.eagerness = GetParam()});

  std::string histogram_suffix =
      GetPrefetchEagernessHistogramSuffix(GetParam());
  histogram_tester.ExpectUniqueTimeSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.BlockUntilHeadDuration.NotServed.%s",
          histogram_suffix.c_str()),
      base::Milliseconds(1000), 1);
  histogram_tester.ExpectUniqueSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.WasBlockedUntilHeadWhenServing.%s",
          histogram_suffix.c_str()),
      true, 1);
}

#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_HeadReceivedBeforeTimeout DISABLED_HeadReceivedBeforeTimeout
#else
#define MAYBE_HeadReceivedBeforeTimeout HeadReceivedBeforeTimeout
#endif
TEST_P(PrefetchServiceAlwaysBlockUntilHeadWithTimeoutTest,
       MAYBE_HeadReceivedBeforeTimeout) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true, GetParam()));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(
      GURL("https://example.com"),
      {.use_prefetch_proxy = true,
       .expected_priority = ExpectedPriorityForEagerness(GetParam())});

  // Navigate to the URL before the head of the prefetch response is received
  Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());

  // Request the prefetch from the PrefetchService. The given callback should be
  // triggered once the timeout is exceeded.
  base::test::TestFuture<PrefetchContainer::Reader> future;
  GetPrefetchToServe(future, GURL("https://example.com"),
                     main_rfh()->GetGlobalId());
  EXPECT_FALSE(future.IsReady());

  task_environment()->FastForwardBy(base::Milliseconds(1000));
  PrefetchContainer::Reader serveable_reader = future.Take();
  EXPECT_FALSE(serveable_reader);

  // If the prefetch is received after the block until head has timed out, it
  // will not be used.
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  // Check the metrics now that the prefetch is complete.
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  EXPECT_FALSE(serveable_reader);

  ExpectCorrectUkmLogs({.eagerness = GetParam()});

  std::string histogram_suffix =
      GetPrefetchEagernessHistogramSuffix(GetParam());
  histogram_tester.ExpectUniqueTimeSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.BlockUntilHeadDuration.NotServed.%s",
          histogram_suffix.c_str()),
      base::Milliseconds(1000), 1);
  histogram_tester.ExpectUniqueSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.WasBlockedUntilHeadWhenServing.%s",
          histogram_suffix.c_str()),
      true, 1);
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS)
#define MAYBE_MultipleGetPrefetchToServe DISABLED_MultipleGetPrefetchToServe
#else
#define MAYBE_MultipleGetPrefetchToServe MultipleGetPrefetchToServe
#endif
TEST_P(PrefetchServiceAlwaysBlockUntilHeadWithTimeoutTest,
       MAYBE_MultipleGetPrefetchToServe) {
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>());

  MakePrefetchOnMainFrame(
      GURL("https://example.com"),
      PrefetchType(/*use_prefetch_proxy=*/true, GetParam()));
  task_environment()->RunUntilIdle();

  VerifyCommonRequestState(
      GURL("https://example.com"),
      {.use_prefetch_proxy = true,
       .expected_priority = ExpectedPriorityForEagerness(GetParam())});
  {
    // Navigate to the URL before the head of the prefetch response is received
    Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());
    PrefetchMatchResolver* prefetch_match_resolver =
        GetPrefetchMatchResolverForMostRecentNavigation();
    // Request the prefetch from the PrefetchService. The same prefetch will be
    // requested again, so this callback will not be called.
    prefetch_match_resolver->SetOnPrefetchToServeReadyCallback(base::BindOnce(
        [](PrefetchContainer::Reader prefetch_to_serve) { NOTREACHED(); }));
    prefetch_service_->GetPrefetchToServe(
        PrefetchContainer::Key(main_rfh()->GetGlobalId(),
                               GURL("https://example.com")),
        *prefetch_match_resolver);
  }
  {
    Navigate(GURL("https://example.com"), main_rfh()->GetFrameToken());
    // Request the prefetch from the PrefetchService a second time. This
    // callback should be triggered once the timeout is exceeded.
    base::test::TestFuture<PrefetchContainer::Reader> future;
    GetPrefetchToServe(future, GURL("https://example.com"),
                       main_rfh()->GetGlobalId());
    EXPECT_FALSE(future.IsReady());
    task_environment()->FastForwardBy(base::Milliseconds(1000));
    PrefetchContainer::Reader serveable_reader = future.Take();
    EXPECT_FALSE(serveable_reader);
  }
  // If the prefetch is received after the block until head has timed out, it
  // will not be used.
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/true,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  // Check the metrics now that the prefetch is complete.
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 1);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_TRUE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  ExpectCorrectUkmLogs({.eagerness = GetParam()});

  std::string histogram_suffix =
      GetPrefetchEagernessHistogramSuffix(GetParam());
  histogram_tester.ExpectUniqueTimeSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.BlockUntilHeadDuration.NotServed.%s",
          histogram_suffix.c_str()),
      base::Milliseconds(1000), 1);
  histogram_tester.ExpectUniqueSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.WasBlockedUntilHeadWhenServing.%s",
          histogram_suffix.c_str()),
      true, 1);
}

INSTANTIATE_TEST_SUITE_P(
    ParametrizedTests,
    PrefetchServiceAlwaysBlockUntilHeadWithTimeoutTest,
    testing::Values(blink::mojom::SpeculationEagerness::kModerate,
                    blink::mojom::SpeculationEagerness::kConservative));

class PrefetchServiceNewLimitsTest : public PrefetchServiceTest {
 public:
  void InitScopedFeatureList() override {
    scoped_feature_list_.InitWithFeaturesAndParameters(
        {{features::kPrefetchUseContentRefactor,
          {{"ineligible_decoy_request_probability", "0"},
           {"prefetch_container_lifetime_s", "-1"}}},
         {::features::kPrefetchNewLimits,
          {{"max_eager_prefetches", "2"}, {"max_non_eager_prefetches", "2"}}}},
        {network::features::kPrefetchNoVarySearch});
  }

  PrefetchContainer::Reader CompletePrefetch(
      GURL url,
      blink::mojom::SpeculationEagerness eagerness) {
    MakePrefetchOnMainFrame(
        url, PrefetchType(/*use_prefetch_proxy=*/false, eagerness));
    task_environment()->RunUntilIdle();
    return CompleteExistingPrefetch(
        url, {.expected_priority = ExpectedPriorityForEagerness(eagerness)});
  }

  // Unlike the above method, this expects the prefetch for |url| to have
  // already been triggered.
  PrefetchContainer::Reader CompleteExistingPrefetch(
      GURL url,
      const VerifyCommonRequestStateOptions& common_options = {}) {
    VerifyCommonRequestState(url, common_options);
    MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                        /*use_prefetch_proxy=*/false,
                        {{"X-Testing", "Hello World"}}, kHTMLBody);
    Navigate(url, main_rfh()->GetFrameToken());
    return GetPrefetchToServe(url);
  }
};

TEST_F(PrefetchServiceNewLimitsTest,
       NonEagerPrefetchAllowedWhenEagerLimitIsReached) {
  const GURL url_1 = GURL("https://example.com/one");
  const GURL url_2 = GURL("https://example.com/two");
  const GURL url_3 = GURL("https://example.com/three");
  const GURL url_4 = GURL("https://example.com/four");

  NavigateAndCommit(GURL("https://example.com"));

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(
          /*num_on_prefetch_likely_calls=*/4));

  ASSERT_TRUE(
      CompletePrefetch(url_1, blink::mojom::SpeculationEagerness::kEager));
  ASSERT_TRUE(
      CompletePrefetch(url_2, blink::mojom::SpeculationEagerness::kEager));

  // Note: |url_3| is not prefetched as the limit for eager prefetches has been
  // reached.
  MakePrefetchOnMainFrame(
      url_3, PrefetchType(/*use_prefetch_proxy=*/false,
                          blink::mojom::SpeculationEagerness::kEager));
  task_environment()->RunUntilIdle();
  EXPECT_EQ(RequestCount(), 0);
  Navigate(url_3, main_rfh()->GetFrameToken());
  ASSERT_FALSE(GetPrefetchToServe(url_3));

  // We can still prefetch |url_4| as it is a conservative prefetch.
  auto non_eager_prefetch = CompletePrefetch(
      url_4, blink::mojom::SpeculationEagerness::kConservative);
  ASSERT_TRUE(non_eager_prefetch);
  EXPECT_EQ(non_eager_prefetch.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 4);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 4);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 3);
}

TEST_F(PrefetchServiceNewLimitsTest, NonEagerPrefetchEvictedAtLimit) {
  const GURL url_1 = GURL("https://example.com/one");
  const GURL url_2 = GURL("https://example.com/two");
  const GURL url_3 = GURL("https://example.com/three");
  const GURL url_4 = GURL("https://example.com/four");

  NavigateAndCommit(GURL("https://example.com"));

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(
          /*num_on_prefetch_likely_calls=*/4));

  base::MockRepeatingCallback<void(const GURL& url)> mock_destruction_callback;
  EXPECT_CALL(mock_destruction_callback, Run(url_1)).Times(1);
  EXPECT_CALL(mock_destruction_callback, Run(url_2)).Times(1);
  PrefetchDocumentManager::GetOrCreateForCurrentDocument(main_rfh())
      ->SetPrefetchDestructionCallback(mock_destruction_callback.Get());

  auto prefetch_1 =
      CompletePrefetch(url_1, blink::mojom::SpeculationEagerness::kModerate);
  ASSERT_TRUE(prefetch_1);
  EXPECT_EQ(prefetch_1.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);

  auto prefetch_2 =
      CompletePrefetch(url_2, blink::mojom::SpeculationEagerness::kModerate);
  ASSERT_TRUE(prefetch_2);
  EXPECT_EQ(prefetch_2.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  ASSERT_TRUE(prefetch_1);

  auto prefetch_3 =
      CompletePrefetch(url_3, blink::mojom::SpeculationEagerness::kModerate);
  ASSERT_TRUE(prefetch_3);
  EXPECT_EQ(prefetch_3.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  // Prefetch for |url_1| should have been evicted to allow a prefetch of
  // |url_3|.
  ASSERT_FALSE(prefetch_1);
  ASSERT_TRUE(prefetch_2);

  auto prefetch_4 =
      CompletePrefetch(url_4, blink::mojom::SpeculationEagerness::kModerate);
  ASSERT_TRUE(prefetch_4);
  EXPECT_EQ(prefetch_4.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  // Prefetch for |url_2| should have been evicted to allow a prefetch of
  // |url_4|.
  ASSERT_FALSE(prefetch_2);
  ASSERT_TRUE(prefetch_3);

  // The first and second prefetches should have failure reason set to
  // 'kPrefetchEvicted'.
  {
    const auto source_id = ForceLogsUploadAndGetUkmId();
    auto actual_attempts = test_ukm_recorder()->GetEntries(
        ukm::builders::Preloading_Attempt::kEntryName,
        test::kPreloadingAttemptUkmMetrics);
    EXPECT_EQ(actual_attempts.size(), 4u);

    std::vector<ukm::TestUkmRecorder::HumanReadableUkmEntry> expected_attempts =
        {attempt_entry_builder()->BuildEntry(
             source_id, PreloadingType::kPrefetch,
             PreloadingEligibility::kEligible,
             PreloadingHoldbackStatus::kAllowed,
             PreloadingTriggeringOutcome::kFailure,
             ToPreloadingFailureReason(
                 content::PrefetchStatus::kPrefetchEvicted),
             /*accurate=*/false,
             /*ready_time=*/
             base::ScopedMockElapsedTimersForTest::kMockElapsedTime,
             blink::mojom::SpeculationEagerness::kModerate),
         attempt_entry_builder()->BuildEntry(
             source_id, PreloadingType::kPrefetch,
             PreloadingEligibility::kEligible,
             PreloadingHoldbackStatus::kAllowed,
             PreloadingTriggeringOutcome::kFailure,
             ToPreloadingFailureReason(
                 content::PrefetchStatus::kPrefetchEvicted),
             /*accurate=*/false,
             /*ready_time=*/
             base::ScopedMockElapsedTimersForTest::kMockElapsedTime,
             blink::mojom::SpeculationEagerness::kModerate),
         attempt_entry_builder()->BuildEntry(
             source_id, PreloadingType::kPrefetch,
             PreloadingEligibility::kEligible,
             PreloadingHoldbackStatus::kAllowed,
             PreloadingTriggeringOutcome::kReady,
             PreloadingFailureReason::kUnspecified,
             /*accurate=*/false,
             /*ready_time=*/
             base::ScopedMockElapsedTimersForTest::kMockElapsedTime,
             blink::mojom::SpeculationEagerness::kModerate),
         attempt_entry_builder()->BuildEntry(
             source_id, PreloadingType::kPrefetch,
             PreloadingEligibility::kEligible,
             PreloadingHoldbackStatus::kAllowed,
             PreloadingTriggeringOutcome::kReady,
             PreloadingFailureReason::kUnspecified,
             /*accurate=*/false,
             /*ready_time=*/
             base::ScopedMockElapsedTimersForTest::kMockElapsedTime,
             blink::mojom::SpeculationEagerness::kModerate)};
    EXPECT_THAT(actual_attempts,
                testing::UnorderedElementsAreArray(expected_attempts))
        << test::ActualVsExpectedUkmEntriesToString(actual_attempts,
                                                    expected_attempts);
  }
}

TEST_F(PrefetchServiceNewLimitsTest, PrefetchWithNoCandidateIsNotStarted) {
  const GURL url_1 = GURL("https://example.com/one");
  const GURL url_2 = GURL("https://example.com/two");
  const GURL url_3 = GURL("https://example.com/three");

  NavigateAndCommit(GURL("https://example.com"));

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(
          /*num_on_prefetch_likely_calls=*/3));

  auto candidate_1 = blink::mojom::SpeculationCandidate::New();
  candidate_1->url = url_1;
  candidate_1->action = blink::mojom::SpeculationAction::kPrefetch;
  candidate_1->eagerness = blink::mojom::SpeculationEagerness::kEager;
  candidate_1->referrer = blink::mojom::Referrer::New();
  auto candidate_2 = candidate_1.Clone();
  candidate_2->url = url_2;
  auto candidate_3 = candidate_1.Clone();
  candidate_3->url = url_3;

  auto* prefetch_document_manager =
      PrefetchDocumentManager::GetOrCreateForCurrentDocument(main_rfh());
  ASSERT_TRUE(prefetch_document_manager);

  base::MockRepeatingCallback<void(const GURL& url)> mock_destruction_callback;
  EXPECT_CALL(mock_destruction_callback, Run(url_2)).Times(1);
  prefetch_document_manager->SetPrefetchDestructionCallback(
      mock_destruction_callback.Get());

  // Send 3 candidates to PrefetchDocumentManager.
  std::vector<blink::mojom::SpeculationCandidatePtr> candidates;
  candidates.push_back(candidate_1.Clone());
  candidates.push_back(candidate_2.Clone());
  candidates.push_back(candidate_3.Clone());
  prefetch_document_manager->ProcessCandidates(candidates,
                                               /*devtools_observer=*/nullptr);
  task_environment()->RunUntilIdle();
  VerifyCommonRequestState(url_1);

  // Remove |url_2| from the list of candidates while a prefetch for |url_1| is
  // in progress.
  candidates.clear();
  candidates.push_back(candidate_1.Clone());
  candidates.push_back(candidate_3.Clone());
  prefetch_document_manager->ProcessCandidates(candidates,
                                               /*devtools_observer=*/nullptr);

  // Finish prefetch of |url_1|.
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/false,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);
  // PrefetchService skips |url_2| because its candidate was removed, and starts
  // prefetching |url_3| instead.
  VerifyCommonRequestState(url_3);
  // Finish prefetch of |url_2|.
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/false,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);
  // There should be no pending prefetch requests.
  EXPECT_EQ(RequestCount(), 0);
}

TEST_F(PrefetchServiceNewLimitsTest,
       InProgressPrefetchWithNoCandidateIsCancelled) {
  const GURL url_1 = GURL("https://example.com/one");
  const GURL url_2 = GURL("https://example.com/two");

  NavigateAndCommit(GURL("https://example.com"));

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(
          /*num_on_prefetch_likely_calls=*/2));

  auto candidate_1 = blink::mojom::SpeculationCandidate::New();
  candidate_1->url = url_1;
  candidate_1->action = blink::mojom::SpeculationAction::kPrefetch;
  candidate_1->eagerness = blink::mojom::SpeculationEagerness::kEager;
  candidate_1->referrer = blink::mojom::Referrer::New();
  auto candidate_2 = candidate_1.Clone();
  candidate_2->url = url_2;

  auto* prefetch_document_manager =
      PrefetchDocumentManager::GetOrCreateForCurrentDocument(main_rfh());
  ASSERT_TRUE(prefetch_document_manager);

  base::MockRepeatingCallback<void(const GURL& url)> mock_destruction_callback;
  EXPECT_CALL(mock_destruction_callback, Run(url_1)).Times(1);
  prefetch_document_manager->SetPrefetchDestructionCallback(
      mock_destruction_callback.Get());

  // Send 2 candidates to PrefetchDocumentManager.
  std::vector<blink::mojom::SpeculationCandidatePtr> candidates;
  candidates.push_back(candidate_1.Clone());
  candidates.push_back(candidate_2.Clone());
  prefetch_document_manager->ProcessCandidates(candidates,
                                               /*devtools_observer=*/nullptr);
  task_environment()->RunUntilIdle();

  // Prefetch for |url_1| should have started.
  VerifyCommonRequestState(url_1);

  // Remove |candidate_1|.
  candidates.clear();
  candidates.push_back(candidate_2.Clone());
  prefetch_document_manager->ProcessCandidates(candidates,
                                               /*devtools_observer=*/nullptr);
  task_environment()->RunUntilIdle();

  // The prefetch for |url_1| should be cancelled, and prefetch for |url_2|
  // should have started.

  EXPECT_EQ(test_url_loader_factory_.pending_requests()->size(), 2u);
  // The client for the first request should be disconnected.
  EXPECT_FALSE(
      test_url_loader_factory_.GetPendingRequest(0)->client.is_connected());
  // Clears out first request.
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/false,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);
  VerifyCommonRequestState(url_2);
  Navigate(url_1, main_rfh()->GetFrameToken());
  PrefetchContainer::Reader serveable_reader = GetPrefetchToServe(url_1);
  EXPECT_FALSE(serveable_reader);
}

TEST_F(PrefetchServiceNewLimitsTest,
       CompletedPrefetchWithNoCandidateIsEvicted) {
  const GURL url_1 = GURL("https://example.com/one");
  const GURL url_2 = GURL("https://example.com/two");
  const GURL url_3 = GURL("https://example.com/three");

  NavigateAndCommit(GURL("https://example.com"));

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(
          /*num_on_prefetch_likely_calls=*/2));

  auto candidate_1 = blink::mojom::SpeculationCandidate::New();
  candidate_1->url = url_1;
  candidate_1->action = blink::mojom::SpeculationAction::kPrefetch;
  candidate_1->eagerness = blink::mojom::SpeculationEagerness::kEager;
  candidate_1->referrer = blink::mojom::Referrer::New();
  auto candidate_2 = candidate_1.Clone();
  candidate_2->url = url_2;

  auto* prefetch_document_manager =
      PrefetchDocumentManager::GetOrCreateForCurrentDocument(main_rfh());
  ASSERT_TRUE(prefetch_document_manager);

  base::MockRepeatingCallback<void(const GURL& url)> mock_destruction_callback;
  EXPECT_CALL(mock_destruction_callback, Run(url_1)).Times(1);
  prefetch_document_manager->SetPrefetchDestructionCallback(
      mock_destruction_callback.Get());

  // Send 2 candidates to PrefetchDocumentManager.
  std::vector<blink::mojom::SpeculationCandidatePtr> candidates;
  candidates.push_back(candidate_1.Clone());
  candidates.push_back(candidate_2.Clone());
  prefetch_document_manager->ProcessCandidates(candidates,
                                               /*devtools_observer=*/nullptr);
  task_environment()->RunUntilIdle();

  // Complete prefetches for |url_1| and |url_2|.
  auto prefetch_1 = CompleteExistingPrefetch(url_1);
  ASSERT_TRUE(prefetch_1);
  auto prefetch_2 = CompleteExistingPrefetch(url_2);
  ASSERT_TRUE(prefetch_2);

  // Remove |candidate_1|.
  candidates.clear();
  candidates.push_back(candidate_2.Clone());
  prefetch_document_manager->ProcessCandidates(candidates,
                                               /*devtools_observer=*/nullptr);
  task_environment()->RunUntilIdle();
  // |prefetch_1| should have been removed.
  EXPECT_FALSE(prefetch_1);
  EXPECT_TRUE(prefetch_2);
}

// Test to see if we can re-prefetch a url whose previous prefetch expired.
TEST_F(PrefetchServiceNewLimitsTest, PrefetchReset) {
  base::test::ScopedFeatureList scoped_feature_list;
  scoped_feature_list.InitWithFeaturesAndParameters(
      {{features::kPrefetchUseContentRefactor,
        {{"ineligible_decoy_request_probability", "0"},
         {"prefetch_container_lifetime_s", "1"}}}},
      {});

  NavigateAndCommit(GURL("https://example.com"));
  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(
          /*num_on_prefetch_likely_calls=*/2));

  auto* prefetch_document_manager =
      PrefetchDocumentManager::GetOrCreateForCurrentDocument(main_rfh());

  const auto url = GURL("https://example.com/one");
  base::MockRepeatingCallback<void(const GURL& url)> mock_destruction_callback;
  EXPECT_CALL(mock_destruction_callback, Run(url)).Times(1);
  prefetch_document_manager->SetPrefetchDestructionCallback(
      mock_destruction_callback.Get());

  auto candidate = blink::mojom::SpeculationCandidate::New();
  candidate->url = url;
  candidate->action = blink::mojom::SpeculationAction::kPrefetch;
  candidate->eagerness = blink::mojom::SpeculationEagerness::kEager;
  candidate->referrer = blink::mojom::Referrer::New();

  // Start and complete prefetch of |url|.
  std::vector<blink::mojom::SpeculationCandidatePtr> candidates;
  candidates.push_back(candidate.Clone());
  prefetch_document_manager->ProcessCandidates(candidates,
                                               /*devtools_observer=*/nullptr);
  auto prefetch = CompleteExistingPrefetch(url);
  ASSERT_TRUE(prefetch);
  EXPECT_EQ(prefetch.GetPrefetchStatus(), PrefetchStatus::kPrefetchSuccessful);

  // Fast forward by a second and expire |prefetch|.
  task_environment()->FastForwardBy(base::Seconds(1));
  EXPECT_FALSE(prefetch);

  // Try reprefetching |url|.
  // TODO(crbug.com/1245014): Ideally this prefetch would be requeued
  // automatically.
  candidates.clear();
  candidates.push_back(candidate.Clone());
  prefetch_document_manager->ProcessCandidates(candidates,
                                               /*devtools_observer=*/nullptr);
  // Prefetch for |url| should have started again.
  VerifyCommonRequestState(url);
}

TEST_F(PrefetchServiceNewLimitsTest, NextPrefetchQueuedImmediatelyAfterReset) {
  base::test::ScopedFeatureList scoped_feature_list;
  scoped_feature_list.InitWithFeaturesAndParameters(
      {{features::kPrefetchUseContentRefactor,
        {{"ineligible_decoy_request_probability", "0"},
         {"prefetch_container_lifetime_s", "1"}}},
       {::features::kPrefetchNewLimits, {{"max_eager_prefetches", "1"}}}},
      {});

  NavigateAndCommit(GURL("https://example.com"));
  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(
          /*num_on_prefetch_likely_calls=*/2));

  auto* prefetch_document_manager =
      PrefetchDocumentManager::GetOrCreateForCurrentDocument(main_rfh());
  const auto url_1 = GURL("https://example.com/one");
  const auto url_2 = GURL("https://example.com/two");

  base::MockRepeatingCallback<void(const GURL& url)> mock_destruction_callback;
  EXPECT_CALL(mock_destruction_callback, Run(url_1)).Times(1);
  prefetch_document_manager->SetPrefetchDestructionCallback(
      mock_destruction_callback.Get());

  auto candidate_1 = blink::mojom::SpeculationCandidate::New();
  candidate_1->url = url_1;
  candidate_1->action = blink::mojom::SpeculationAction::kPrefetch;
  candidate_1->eagerness = blink::mojom::SpeculationEagerness::kEager;
  candidate_1->referrer = blink::mojom::Referrer::New();
  auto candidate_2 = candidate_1->Clone();
  candidate_2->url = url_2;

  // Add |candidate_1| and |candidate_2|.
  std::vector<blink::mojom::SpeculationCandidatePtr> candidates;
  candidates.push_back(candidate_1.Clone());
  candidates.push_back(candidate_2.Clone());
  prefetch_document_manager->ProcessCandidates(candidates,
                                               /*devtools_observer=*/nullptr);
  task_environment()->RunUntilIdle();

  // Complete |prefetch| of |url_1|.
  auto prefetch_1 = CompleteExistingPrefetch(url_1);
  ASSERT_TRUE(prefetch_1);
  EXPECT_EQ(prefetch_1.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);

  // Prefetch of |url_2| should not be queued because we are at the limit.
  EXPECT_EQ(RequestCount(), 0);

  // Fast forward by a second and expire |prefetch_1|.
  task_environment()->FastForwardBy(base::Seconds(1));
  EXPECT_FALSE(prefetch_1);

  // Prefetch of |url_2| should now be queued.
  VerifyCommonRequestState(url_2);
}

TEST_F(PrefetchServiceNewLimitsTest, EagerPrefetchLimitIsDynamic) {
  const GURL url_1 = GURL("https://example.com/one");
  const GURL url_2 = GURL("https://example.com/two");
  const GURL url_3 = GURL("https://example.com/three");

  NavigateAndCommit(GURL("https://example.com"));

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(
          /*num_on_prefetch_likely_calls=*/4));

  auto* prefetch_document_manager =
      PrefetchDocumentManager::GetOrCreateForCurrentDocument(main_rfh());
  ASSERT_TRUE(prefetch_document_manager);

  base::MockRepeatingCallback<void(const GURL& url)> mock_destruction_callback;
  EXPECT_CALL(mock_destruction_callback, Run(url_1)).Times(1);
  EXPECT_CALL(mock_destruction_callback, Run(url_2)).Times(1);
  prefetch_document_manager->SetPrefetchDestructionCallback(
      mock_destruction_callback.Get());

  auto candidate_1 = blink::mojom::SpeculationCandidate::New();
  candidate_1->url = url_1;
  candidate_1->action = blink::mojom::SpeculationAction::kPrefetch;
  candidate_1->eagerness = blink::mojom::SpeculationEagerness::kEager;
  candidate_1->referrer = blink::mojom::Referrer::New();
  auto candidate_2 = candidate_1.Clone();
  candidate_2->url = url_2;
  auto candidate_3 = candidate_1.Clone();
  candidate_3->url = url_3;

  // Send |candidate_1| and |candidate_2|.
  std::vector<blink::mojom::SpeculationCandidatePtr> candidates;
  candidates.push_back(candidate_1.Clone());
  candidates.push_back(candidate_2.Clone());
  prefetch_document_manager->ProcessCandidates(candidates,
                                               /*devtools_observer=*/nullptr);
  task_environment()->RunUntilIdle();

  auto prefetch_1 = CompleteExistingPrefetch(url_1);
  ASSERT_TRUE(prefetch_1);
  EXPECT_EQ(prefetch_1.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  auto prefetch_2 = CompleteExistingPrefetch(url_2);
  ASSERT_TRUE(prefetch_2);
  EXPECT_EQ(prefetch_2.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);

  // Remove |candidate_1| and add |candidate_3|.
  candidates.clear();
  candidates.push_back(candidate_2.Clone());
  candidates.push_back(candidate_3.Clone());
  prefetch_document_manager->ProcessCandidates(candidates,
                                               /*devtools_observer=*/nullptr);
  task_environment()->RunUntilIdle();

  // Prefetch for |url_3| should succeed, and |prefetch_1| should be evicted.
  auto prefetch_3 = CompleteExistingPrefetch(url_3);
  ASSERT_TRUE(prefetch_3);
  EXPECT_EQ(prefetch_3.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_FALSE(prefetch_1);
  EXPECT_TRUE(prefetch_2);

  // Re-add |candidate_1|.
  candidates.clear();
  candidates.push_back(candidate_1.Clone());
  candidates.push_back(candidate_2.Clone());
  candidates.push_back(candidate_3.Clone());
  prefetch_document_manager->ProcessCandidates(candidates,
                                               /*devtools_observer=*/nullptr);
  task_environment()->RunUntilIdle();

  // |url_1| should not be reprefetched because we are at the limit.
  EXPECT_EQ(RequestCount(), 0);

  // Remove |candidate_2|.
  candidates.clear();
  candidates.push_back(candidate_1.Clone());
  candidates.push_back(candidate_3.Clone());
  prefetch_document_manager->ProcessCandidates(candidates,
                                               /*devtools_observer=*/nullptr);
  task_environment()->RunUntilIdle();

  // Prefetch for |url_1| should succeed, |prefetch_2| will be evicted
  // (because |candidate_2| was removed).
  prefetch_1 = CompleteExistingPrefetch(url_1);
  ASSERT_TRUE(prefetch_1);
  EXPECT_EQ(prefetch_1.GetPrefetchStatus(),
            PrefetchStatus::kPrefetchSuccessful);
  EXPECT_FALSE(prefetch_2);
  EXPECT_TRUE(prefetch_3);

  // The first and second prefetches should have failure reason set to
  // 'kPrefetchEvicted', and the fourth prefetch should have failure reason
  // set to |kPrefetchFailedPerPageLimitExceeded|.
  {
    const auto source_id = ForceLogsUploadAndGetUkmId();
    auto actual_attempts = test_ukm_recorder()->GetEntries(
        ukm::builders::Preloading_Attempt::kEntryName,
        test::kPreloadingAttemptUkmMetrics);
    EXPECT_EQ(actual_attempts.size(), 4u);

    std::vector<ukm::TestUkmRecorder::HumanReadableUkmEntry> expected_attempts =
        // |url_1|, attempt #1 (evicted)
        {attempt_entry_builder()->BuildEntry(
             source_id, PreloadingType::kPrefetch,
             PreloadingEligibility::kEligible,
             PreloadingHoldbackStatus::kAllowed,
             PreloadingTriggeringOutcome::kFailure,
             ToPreloadingFailureReason(
                 content::PrefetchStatus::kPrefetchEvicted),
             /*accurate=*/false,
             /*ready_time=*/
             base::ScopedMockElapsedTimersForTest::kMockElapsedTime,
             blink::mojom::SpeculationEagerness::kEager),
         // |url_2| (evicted)
         attempt_entry_builder()->BuildEntry(
             source_id, PreloadingType::kPrefetch,
             PreloadingEligibility::kEligible,
             PreloadingHoldbackStatus::kAllowed,
             PreloadingTriggeringOutcome::kFailure,
             ToPreloadingFailureReason(
                 content::PrefetchStatus::kPrefetchEvicted),
             /*accurate=*/false,
             /*ready_time=*/
             base::ScopedMockElapsedTimersForTest::kMockElapsedTime,
             blink::mojom::SpeculationEagerness::kEager),
         // |url_3| (ready)
         attempt_entry_builder()->BuildEntry(
             source_id, PreloadingType::kPrefetch,
             PreloadingEligibility::kEligible,
             PreloadingHoldbackStatus::kAllowed,
             PreloadingTriggeringOutcome::kReady,
             PreloadingFailureReason::kUnspecified,
             /*accurate=*/false,
             /*ready_time=*/
             base::ScopedMockElapsedTimersForTest::kMockElapsedTime,
             blink::mojom::SpeculationEagerness::kEager),
         // |url_1|, attempt #2 (ready)
         attempt_entry_builder()->BuildEntry(
             source_id, PreloadingType::kPrefetch,
             PreloadingEligibility::kEligible,
             PreloadingHoldbackStatus::kAllowed,
             PreloadingTriggeringOutcome::kReady,
             PreloadingFailureReason::kUnspecified,
             /*accurate=*/false,
             /*ready_time=*/
             base::ScopedMockElapsedTimersForTest::kMockElapsedTime,
             blink::mojom::SpeculationEagerness::kEager)};
    EXPECT_THAT(actual_attempts,
                testing::UnorderedElementsAreArray(expected_attempts))
        << test::ActualVsExpectedUkmEntriesToString(actual_attempts,
                                                    expected_attempts);
  }
}

TEST_F(PrefetchServiceNewLimitsTest, RemoveCandidateForFailedPrefetch) {
  const GURL url = GURL("https://example.com/one");

  NavigateAndCommit(GURL("https://example.com"));

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(
          /*num_on_prefetch_likely_calls=*/1));

  auto candidate = blink::mojom::SpeculationCandidate::New();
  candidate->url = url;
  candidate->action = blink::mojom::SpeculationAction::kPrefetch;
  candidate->eagerness = blink::mojom::SpeculationEagerness::kEager;
  candidate->referrer = blink::mojom::Referrer::New();

  auto* prefetch_document_manager =
      PrefetchDocumentManager::GetOrCreateForCurrentDocument(main_rfh());
  ASSERT_TRUE(prefetch_document_manager);

  base::MockRepeatingCallback<void(const GURL& url)> mock_destruction_callback;
  EXPECT_CALL(mock_destruction_callback, Run(url)).Times(1);
  prefetch_document_manager->SetPrefetchDestructionCallback(
      mock_destruction_callback.Get());

  // Send canadidate to PrefetchDocumentManager.
  std::vector<blink::mojom::SpeculationCandidatePtr> candidates;
  candidates.push_back(candidate.Clone());
  prefetch_document_manager->ProcessCandidates(candidates,
                                               /*devtools_observer=*/nullptr);
  task_environment()->RunUntilIdle();

  // Prefetch for |url| should have started.
  VerifyCommonRequestState(url);
  // Send error response for prefetch of |url|
  MakeResponseAndWait(net::HTTP_OK, net::ERR_FAILED, kHTMLMimeType,
                      /*use_prefetch_proxy=*/false,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);

  // Remove |candidate|.
  candidates.clear();
  prefetch_document_manager->ProcessCandidates(candidates,
                                               /*devtools_observer=*/nullptr);
  task_environment()->RunUntilIdle();

  ExpectCorrectUkmLogs({.outcome = PreloadingTriggeringOutcome::kFailure,
                        .failure = ToPreloadingFailureReason(
                            PrefetchStatus::kPrefetchFailedNetError)});
}

class PrefetchServiceWaitForMultiplePrefetchesBlockedUntilHeadTest
    : public PrefetchServiceTest,
      public ::testing::WithParamInterface<blink::mojom::SpeculationEagerness> {
 public:
  void InitScopedFeatureList() override {
    scoped_feature_list_.InitWithFeaturesAndParameters(
        {{features::kPrefetchUseContentRefactor,
          {
              {"ineligible_decoy_request_probability", "0"},
              {"prefetch_container_lifetime_s", "-1"},
              {"prefetch_timeout_ms", "10000"},
              {"block_until_head_eager_prefetch", "true"},
              {"block_until_head_moderate_prefetch", "true"},
              {"block_until_head_conservative_prefetch", "true"},
              // Initialize timeouts > 0ms for testing purposes.
              {"block_until_head_timeout_eager_prefetch", "1000"},
              {"block_until_head_timeout_moderate_prefetch", "1000"},
              {"block_until_head_timeout_conservative_prefetch", "1000"},
              {"max_concurrent_prefetches", "2"},
          }},
         // For this test class we need to enable kPrefetchNoVarySearch.
         {network::features::kPrefetchNoVarySearch, {}}},
        {});
  }
};

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_CASTOS)
#define MAYBE_NVSBlockUntilHeadReceivedOneMatchOneTimeout \
  DISABLED_NVSBlockUntilHeadReceivedOneMatchOneTimeout
#else
#define MAYBE_NVSBlockUntilHeadReceivedOneMatchOneTimeout \
  NVSBlockUntilHeadReceivedOneMatchOneTimeout
#endif
TEST_P(PrefetchServiceWaitForMultiplePrefetchesBlockedUntilHeadTest,
       MAYBE_NVSBlockUntilHeadReceivedOneMatchOneTimeout) {
  // The scenario is:
  // Prefetch https://example.com/index.html?a=5 with NVS hint/NVS header to
  // ignore "a" and send head/body. Prefetch https://example.com/index.html?b=3
  // with NVS hint to match but send no head/body. Navigate to
  // https://example.com/index.html. Expect https://example.com/index.html?a=5
  // to be served.
  const std::string kTestUrl = "https://example.com/index.html";
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(2));

  {
    network::mojom::NoVarySearchPtr no_vary_search_hint =
        network::mojom::NoVarySearch::New();
    no_vary_search_hint->vary_on_key_order = true;
    no_vary_search_hint->search_variance =
        network::mojom::SearchParamsVariance::NewNoVaryParams(
            std::vector<std::string>({"a"}));
    MakePrefetchOnMainFrame(
        GURL(kTestUrl + "?a=5"),
        PrefetchType(/*use_prefetch_proxy=*/false, GetParam()),
        /* referrer */ blink::mojom::Referrer(),
        /* no_vary_search_support */ true,
        /* no_vary_search_hint */ std::move(no_vary_search_hint));
    task_environment()->RunUntilIdle();

    VerifyCommonRequestState(
        GURL(kTestUrl + "?a=5"),
        {.expected_priority = ExpectedPriorityForEagerness(GetParam())});
  }
  {
    network::mojom::NoVarySearchPtr no_vary_search_hint =
        network::mojom::NoVarySearch::New();
    no_vary_search_hint->vary_on_key_order = true;
    no_vary_search_hint->search_variance =
        network::mojom::SearchParamsVariance::NewNoVaryParams(
            std::vector<std::string>({"b"}));
    MakePrefetchOnMainFrame(
        GURL(kTestUrl + "?b=3"),
        PrefetchType(/*use_prefetch_proxy=*/false, GetParam()),
        /* referrer */ blink::mojom::Referrer(),
        /* no_vary_search_support */ true,
        /* no_vary_search_hint */ std::move(no_vary_search_hint));
    task_environment()->RunUntilIdle();

    VerifyCommonRequestStateByUrl(
        GURL(kTestUrl + "?b=3"),
        {.expected_priority = ExpectedPriorityForEagerness(GetParam())});
  }
  // Navigate to the URL before the head of the prefetch response is received
  Navigate(GURL(kTestUrl), main_rfh()->GetFrameToken());

  // Request the prefetch from the PrefetchService. The given callback shouldn't
  // be called until after the head is received.
  base::RunLoop get_prefetch_run_loop;
  bool is_nav_unblocked = false;
  PrefetchMatchResolver* prefetch_match_resolver =
      GetPrefetchMatchResolverForMostRecentNavigation();
  prefetch_match_resolver->SetOnPrefetchToServeReadyCallback(
      base::BindLambdaForTesting(
          [&is_nav_unblocked, &get_prefetch_run_loop,
           kTestUrl](PrefetchContainer::Reader prefetch_to_serve) {
            ASSERT_TRUE(prefetch_to_serve);
            ASSERT_EQ(prefetch_to_serve.GetPrefetchContainer()->GetURL(),
                      GURL(kTestUrl + "?a=5"));
            is_nav_unblocked = !!prefetch_to_serve;
            get_prefetch_run_loop.Quit();
          }));
  prefetch_service_->GetPrefetchToServe(
      PrefetchContainer::Key(main_rfh()->GetGlobalId(), GURL(kTestUrl)),
      *prefetch_match_resolver);
  EXPECT_FALSE(is_nav_unblocked);

  task_environment()->FastForwardBy(base::Milliseconds(kHeaderLatency));

  // Sends the head of the prefetch response. This should trigger the above
  // callback with a nullptr argument.
  SendHeadOfResponseAndWait(
      net::HTTP_OK, kHTMLMimeType,
      /*use_prefetch_proxy=*/false,
      {{"X-Testing", "Hello World"}, {"No-Vary-Search", "params=(\"a\")"}},
      std::size(kHTMLBody));
  get_prefetch_run_loop.Run();
  ASSERT_TRUE(is_nav_unblocked);

  // Send the body and completion status of the request,
  SendBodyContentOfResponseAndWait(kHTMLBody);
  CompleteResponseAndWait(net::OK, std::size(kHTMLBody));

  // Check the metrics now that the prefetch is complete.
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 2);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 2);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 2);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);

  EXPECT_TRUE(serving_page_metrics->prefetch_status);

  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_FALSE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  std::string histogram_suffix =
      GetPrefetchEagernessHistogramSuffix(GetParam());
  histogram_tester.ExpectUniqueTimeSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.BlockUntilHeadDuration.NotServed.%s",
          histogram_suffix.c_str()),
      base::Milliseconds(kHeaderLatency), 0);
  histogram_tester.ExpectUniqueSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.WasBlockedUntilHeadWhenServing.%s",
          histogram_suffix.c_str()),
      true, 2);
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_CASTOS)
#define MAYBE_FailedCookiesChangedAfterPrefetchStartedTimedoutNVSHintPrefetch \
  DISABLED_FailedCookiesChangedAfterPrefetchStartedTimedoutNVSHintPrefetch
#else
#define MAYBE_FailedCookiesChangedAfterPrefetchStartedTimedoutNVSHintPrefetch \
  FailedCookiesChangedAfterPrefetchStartedTimedoutNVSHintPrefetch
#endif
TEST_P(PrefetchServiceWaitForMultiplePrefetchesBlockedUntilHeadTest,
       MAYBE_FailedCookiesChangedAfterPrefetchStartedTimedoutNVSHintPrefetch) {
  // The scenario is:
  // Prefetch https://example.com/index.html.
  // Prefetch https://example.com/index.html?a=1 with NVS hint to match but send
  // no head/body. Change the cookies. Navigate to
  // https://example.com/index.html. Expect no prefetch to be served.
  const std::string kTestUrl = "https://example.com/index.html";
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(2));
  MakePrefetchOnMainFrame(
      GURL(kTestUrl), PrefetchType(/*use_prefetch_proxy=*/false, GetParam()));
  VerifyCommonRequestState(
      GURL(kTestUrl),
      {.expected_priority = ExpectedPriorityForEagerness(GetParam())});
  task_environment()->RunUntilIdle();
  MakeResponseAndWait(net::HTTP_OK, net::OK, kHTMLMimeType,
                      /*use_prefetch_proxy=*/false,
                      {{"X-Testing", "Hello World"}}, kHTMLBody);
  {
    network::mojom::NoVarySearchPtr no_vary_search_hint =
        network::mojom::NoVarySearch::New();
    no_vary_search_hint->vary_on_key_order = true;
    no_vary_search_hint->search_variance =
        network::mojom::SearchParamsVariance::NewNoVaryParams(
            std::vector<std::string>({"a"}));
    MakePrefetchOnMainFrame(
        GURL(kTestUrl + "?a=1"),
        PrefetchType(/*use_prefetch_proxy=*/false, GetParam()),
        /* referrer */ blink::mojom::Referrer(),
        /* no_vary_search_support */ true,
        /* no_vary_search_hint */ std::move(no_vary_search_hint));
    task_environment()->RunUntilIdle();
    VerifyCommonRequestStateByUrl(
        GURL(kTestUrl + "?a=1"),
        {.expected_priority = ExpectedPriorityForEagerness(GetParam())});
  }

  // Adding a cookie after the prefetch has started will cause it to fail when
  // being served.
  ASSERT_TRUE(SetCookie(GURL("https://example.com"), "testing"));
  task_environment()->RunUntilIdle();

  Navigate(GURL(kTestUrl), main_rfh()->GetFrameToken());

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 2);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 2);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 1);

  // Request the prefetch from the PrefetchService. Since both prefetch
  // candidates are not eligible serveable_reader will be falsy.
  PrefetchContainer::Reader serveable_reader =
      GetPrefetchToServe(GURL("https://example.com/index.html"));
  EXPECT_FALSE(serveable_reader);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchNotUsedCookiesChanged));
  EXPECT_FALSE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_CASTOS)
#define MAYBE_FailedCookiesChangedAfterPrefetchStartedNVSHintPrefetch \
  DISABLED_FailedCookiesChangedAfterPrefetchStartedNVSHintPrefetch
#else
#define MAYBE_FailedCookiesChangedAfterPrefetchStartedNVSHintPrefetch \
  FailedCookiesChangedAfterPrefetchStartedNVSHintPrefetch
#endif
TEST_P(PrefetchServiceWaitForMultiplePrefetchesBlockedUntilHeadTest,
       MAYBE_FailedCookiesChangedAfterPrefetchStartedNVSHintPrefetch) {
  // The scenario is:
  // Start prefetching https://example.com/index.html but send no head/body.
  // Start prefetching https://example.com/index.html?a=1 with NVS hint to match
  // but send no head/body. Change the cookies. Navigate to
  // https://example.com/index.html. Send head/body for
  // https://example.com/index.html. Verify that the navigation is not waiting
  // anymore on https://example.com/index.html?a=1 head. Expect no prefetch to
  // be served.
  const std::string kTestUrl = "https://example.com/index.html";
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(2));
  MakePrefetchOnMainFrame(
      GURL(kTestUrl), PrefetchType(/*use_prefetch_proxy=*/false, GetParam()));
  VerifyCommonRequestState(
      GURL(kTestUrl),
      {.expected_priority = ExpectedPriorityForEagerness(GetParam())});
  task_environment()->RunUntilIdle();
  {
    network::mojom::NoVarySearchPtr no_vary_search_hint =
        network::mojom::NoVarySearch::New();
    no_vary_search_hint->vary_on_key_order = true;
    no_vary_search_hint->search_variance =
        network::mojom::SearchParamsVariance::NewNoVaryParams(
            std::vector<std::string>({"a"}));
    MakePrefetchOnMainFrame(
        GURL(kTestUrl + "?a=1"),
        PrefetchType(/*use_prefetch_proxy=*/false, GetParam()),
        /* referrer */ blink::mojom::Referrer(),
        /* no_vary_search_support */ true,
        /* no_vary_search_hint */ std::move(no_vary_search_hint));
    task_environment()->RunUntilIdle();
    VerifyCommonRequestStateByUrl(
        GURL(kTestUrl + "?a=1"),
        {.expected_priority = ExpectedPriorityForEagerness(GetParam())});
  }

  // Adding a cookie after the prefetch has started will cause it to fail when
  // being served.
  ASSERT_TRUE(SetCookie(GURL("https://example.com"), "testing"));
  task_environment()->RunUntilIdle();

  Navigate(GURL(kTestUrl), main_rfh()->GetFrameToken());

  // Request the prefetch from the PrefetchService. The given callback shouldn't
  // be called until after the head is received.
  // Request the prefetch from the PrefetchService. Since both prefetch
  // candidates are not eligible `prefetch_to_serve` will be falsy.
  base::RunLoop get_prefetch_run_loop;
  bool is_fallback_navigation = false;
  PrefetchMatchResolver* prefetch_match_resolver =
      GetPrefetchMatchResolverForMostRecentNavigation();
  prefetch_match_resolver->SetOnPrefetchToServeReadyCallback(
      base::BindLambdaForTesting(
          [&is_fallback_navigation, &get_prefetch_run_loop,
           prefetch_match_resolver,
           kTestUrl](PrefetchContainer::Reader prefetch_to_serve) {
            EXPECT_FALSE(prefetch_to_serve);
            EXPECT_FALSE(prefetch_match_resolver->IsWaitingForPrefetch(
                GURL(kTestUrl + "?a=1")));
            is_fallback_navigation = !prefetch_to_serve;
            get_prefetch_run_loop.Quit();
          }));
  prefetch_service_->GetPrefetchToServe(
      PrefetchContainer::Key(main_rfh()->GetGlobalId(), GURL(kTestUrl)),
      *prefetch_match_resolver);
  EXPECT_FALSE(is_fallback_navigation);
  task_environment()->RunUntilIdle();

  // Sends the head of the prefetch response. This should not trigger the above
  // callback.
  SendHeadOfResponseAndWait(
      net::HTTP_OK, kHTMLMimeType,
      /*use_prefetch_proxy=*/false,
      {{"X-Testing", "Hello World"}, {"No-Vary-Search", "params=(\"e\")"}},
      std::size(kHTMLBody));
  ASSERT_TRUE(is_fallback_navigation);

  // Send the body and completion status of the request,
  SendBodyContentOfResponseAndWait(kHTMLBody);
  CompleteResponseAndWait(net::OK, std::size(kHTMLBody));

  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 1);
  // We cancel the streaming of this prefetch because we know we cannot use it.
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 0);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 0);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 1);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 1);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 2);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 2);
  // None of the prefetches were successful because of the cookie change.
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 0);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);
  EXPECT_TRUE(serving_page_metrics->prefetch_status);
  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchNotUsedCookiesChanged));
  EXPECT_FALSE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  // Serving page metrics prefetch_header_latency is logged at response
  // complete. Since we cancel streaming the response, this should not be set.
  EXPECT_FALSE(serving_page_metrics->prefetch_header_latency);
}

// TODO(crbug.com/1396460): Test flaky on lacros trybots.
#if BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_CASTOS)
#define MAYBE_NVSBlockUntilHeadReceivedMultipleMatchesByNVSHint \
  DISABLED_NVSBlockUntilHeadReceivedMultipleMatchesByNVSHint
#else
#define MAYBE_NVSBlockUntilHeadReceivedMultipleMatchesByNVSHint \
  NVSBlockUntilHeadReceivedMultipleMatchesByNVSHint
#endif
TEST_P(PrefetchServiceWaitForMultiplePrefetchesBlockedUntilHeadTest,
       MAYBE_NVSBlockUntilHeadReceivedMultipleMatchesByNVSHint) {
  // The scenario is:
  // Prefetch https://example.com/index.html?a=5 with NVS hint to ignore "a" but
  // mismatched NVS header and send head/body. Prefetch
  // https://example.com/index.html?b=3 with NVS hint/NVS header to ignore "b"
  // and send head/body. Navigate to https://example.com/index.html. Make sure
  // to receive ?a=5 prefetch before ?b=3. Expect
  // https://example.com/index.html?b=3 to be served.
  const std::string kTestUrl = "https://example.com/index.html";
  base::HistogramTester histogram_tester;

  MakePrefetchService(
      std::make_unique<testing::NiceMock<MockPrefetchServiceDelegate>>(2));

  {
    network::mojom::NoVarySearchPtr no_vary_search_hint =
        network::mojom::NoVarySearch::New();
    no_vary_search_hint->vary_on_key_order = true;
    no_vary_search_hint->search_variance =
        network::mojom::SearchParamsVariance::NewNoVaryParams(
            std::vector<std::string>({"a"}));
    MakePrefetchOnMainFrame(
        GURL(kTestUrl + "?a=5"),
        PrefetchType(/*use_prefetch_proxy=*/false, GetParam()),
        /* referrer */ blink::mojom::Referrer(),
        /* no_vary_search_support */ true,
        /* no_vary_search_hint */ std::move(no_vary_search_hint));
    task_environment()->RunUntilIdle();

    VerifyCommonRequestState(
        GURL(kTestUrl + "?a=5"),
        {.expected_priority = ExpectedPriorityForEagerness(GetParam())});
  }
  {
    network::mojom::NoVarySearchPtr no_vary_search_hint =
        network::mojom::NoVarySearch::New();
    no_vary_search_hint->vary_on_key_order = true;
    no_vary_search_hint->search_variance =
        network::mojom::SearchParamsVariance::NewNoVaryParams(
            std::vector<std::string>({"b"}));
    MakePrefetchOnMainFrame(
        GURL(kTestUrl + "?b=3"),
        PrefetchType(/*use_prefetch_proxy=*/false, GetParam()),
        /* referrer */ blink::mojom::Referrer(),
        /* no_vary_search_support */ true,
        /* no_vary_search_hint */ std::move(no_vary_search_hint));
    task_environment()->RunUntilIdle();

    VerifyCommonRequestStateByUrl(
        GURL(kTestUrl + "?b=3"),
        {.expected_priority = ExpectedPriorityForEagerness(GetParam())});
  }
  // Navigate to the URL before the head of the prefetch response is received
  Navigate(GURL(kTestUrl), main_rfh()->GetFrameToken());

  // Request the prefetch from the PrefetchService. The given callback shouldn't
  // be called until after the head is received.
  base::RunLoop get_prefetch_run_loop;
  bool is_nav_unblocked = false;
  PrefetchMatchResolver* prefetch_match_resolver =
      GetPrefetchMatchResolverForMostRecentNavigation();
  prefetch_match_resolver->SetOnPrefetchToServeReadyCallback(
      base::BindLambdaForTesting(
          [&is_nav_unblocked, &get_prefetch_run_loop,
           kTestUrl](PrefetchContainer::Reader prefetch_to_serve) {
            ASSERT_TRUE(prefetch_to_serve);
            ASSERT_EQ(prefetch_to_serve.GetPrefetchContainer()->GetURL(),
                      GURL(kTestUrl + "?b=3"));
            is_nav_unblocked = !!prefetch_to_serve;
            get_prefetch_run_loop.Quit();
          }));
  prefetch_service_->GetPrefetchToServe(
      PrefetchContainer::Key(main_rfh()->GetGlobalId(), GURL(kTestUrl)),
      *prefetch_match_resolver);
  EXPECT_FALSE(is_nav_unblocked);
  task_environment()->RunUntilIdle();
  // Sends the head of the prefetch response. This should not trigger the above
  // callback.
  SendHeadOfResponseAndWait(
      net::HTTP_OK, kHTMLMimeType,
      /*use_prefetch_proxy=*/false,
      {{"X-Testing", "Hello World"}, {"No-Vary-Search", "params=(\"e\")"}},
      std::size(kHTMLBody));
  ASSERT_FALSE(is_nav_unblocked);

  // Send the body and completion status of the request,
  SendBodyContentOfResponseAndWait(kHTMLBody);
  CompleteResponseAndWait(net::OK, std::size(kHTMLBody));
  ASSERT_FALSE(is_nav_unblocked);

  SendHeadOfResponseForUrlAndWait(
      GURL(kTestUrl + "?b=3"), net::HTTP_OK, kHTMLMimeType,
      /*use_prefetch_proxy=*/false,
      {{"X-Testing", "Hello World"}, {"No-Vary-Search", "params=(\"b\")"}},
      std::size(kHTMLBody));
  get_prefetch_run_loop.Run();
  ASSERT_TRUE(is_nav_unblocked);

  SendBodyContentOfResponseForUrlAndWait(GURL(kTestUrl + "?b=3"), kHTMLBody);
  CompleteResponseForUrlAndWait(GURL(kTestUrl + "?b=3"), net::OK,
                                std::size(kHTMLBody));

  // Check the metrics now that the prefetch is complete.
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.ExistingPrefetchWithMatchingURL", false, 2);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.RespCode", net::HTTP_OK, 2);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.NetError", net::OK, 2);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.BodyLength", std::size(kHTMLBody), 2);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.TotalTime", kTotalTimeDuration, 2);
  histogram_tester.ExpectUniqueSample(
      "PrefetchProxy.Prefetch.Mainframe.ConnectTime", kConnectTimeDuration, 2);

  absl::optional<PrefetchReferringPageMetrics> referring_page_metrics =
      PrefetchReferringPageMetrics::GetForCurrentDocument(main_rfh());
  EXPECT_EQ(referring_page_metrics->prefetch_attempted_count, 2);
  EXPECT_EQ(referring_page_metrics->prefetch_eligible_count, 2);
  EXPECT_EQ(referring_page_metrics->prefetch_successful_count, 2);

  absl::optional<PrefetchServingPageMetrics> serving_page_metrics =
      GetMetricsForMostRecentNavigation();
  ASSERT_TRUE(serving_page_metrics);

  EXPECT_TRUE(serving_page_metrics->prefetch_status);

  EXPECT_EQ(serving_page_metrics->prefetch_status.value(),
            static_cast<int>(PrefetchStatus::kPrefetchSuccessful));
  EXPECT_FALSE(serving_page_metrics->required_private_prefetch_proxy);
  EXPECT_TRUE(serving_page_metrics->same_tab_as_prefetching_tab);
  EXPECT_TRUE(serving_page_metrics->prefetch_header_latency);
  EXPECT_EQ(serving_page_metrics->prefetch_header_latency.value(),
            base::Milliseconds(kHeaderLatency));

  std::string histogram_suffix =
      GetPrefetchEagernessHistogramSuffix(GetParam());
  histogram_tester.ExpectUniqueTimeSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.BlockUntilHeadDuration.NotServed.%s",
          histogram_suffix.c_str()),
      base::Milliseconds(0), 1);
  histogram_tester.ExpectUniqueSample(
      base::StringPrintf(
          "PrefetchProxy.AfterClick.WasBlockedUntilHeadWhenServing.%s",
          histogram_suffix.c_str()),
      true, 2);
}

INSTANTIATE_TEST_SUITE_P(
    ParametrizedTests,
    PrefetchServiceWaitForMultiplePrefetchesBlockedUntilHeadTest,
    testing::Values(blink::mojom::SpeculationEagerness::kEager,
                    blink::mojom::SpeculationEagerness::kModerate,
                    blink::mojom::SpeculationEagerness::kConservative));

}  // namespace
}  // namespace content