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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <string>
#include "base/macros.h"
#include "net/base/net_export.h"
class GURL;
namespace net {
class HttpRequestHeaders;
class HttpResponseHeaders;
class HostPortPair;
class ProxyInfo;
class ProxyServer;
class ProxyService;
class URLRequest;
// Delegate for setting up a connection.
class NET_EXPORT ProxyDelegate {
ProxyDelegate() {
virtual ~ProxyDelegate() {
// Called as the proxy is being resolved for |url| for a |method| request.
// The caller may pass an empty string to get method agnostic resoulution.
// Allows the delegate to override the proxy resolution decision made by
// ProxyService. The delegate may override the decision by modifying the
// ProxyInfo |result|.
virtual void OnResolveProxy(const GURL& url,
const std::string& method,
const ProxyService& proxy_service,
ProxyInfo* result) = 0;
// Called when use of |bad_proxy| fails due to |net_error|. |net_error| is
// the network error encountered, if any, and OK if the fallback was
// for a reason other than a network error (e.g. the proxy service was
// explicitly directed to skip a proxy).
virtual void OnFallback(const ProxyServer& bad_proxy,
int net_error) = 0;
// Called immediately before a proxy tunnel request is sent.
// Provides the embedder an opportunity to add extra request headers.
virtual void OnBeforeTunnelRequest(const HostPortPair& proxy_server,
HttpRequestHeaders* extra_headers) = 0;
// Called when the connect attempt to a CONNECT proxy has completed.
virtual void OnTunnelConnectCompleted(const HostPortPair& endpoint,
const HostPortPair& proxy_server,
int net_error) = 0;
// Called after the response headers for the tunnel request are received.
virtual void OnTunnelHeadersReceived(
const HostPortPair& origin,
const HostPortPair& proxy_server,
const HttpResponseHeaders& response_headers) = 0;
// Returns true if |proxy_server| is a trusted SPDY/HTTP2 proxy that is
// allowed to push cross-origin resources.
virtual bool IsTrustedSpdyProxy(const net::ProxyServer& proxy_server) = 0;
// Called after the proxy is resolved but before the connection is
// established. |resolved_proxy_server| is the proxy server resolved by the
// proxy service for fetching |url|. Sets |alternative_proxy_server| to an
// alternative proxy server, if one is available to fetch |url|.
// |alternative_proxy_server| is owned by the caller, and is guaranteed to be
// non-null.
virtual void GetAlternativeProxy(
const GURL& url,
const ProxyServer& resolved_proxy_server,
ProxyServer* alternative_proxy_server) const = 0;
// Notifies the ProxyDelegate that |alternative_proxy_server| is broken.
virtual void OnAlternativeProxyBroken(
const ProxyServer& alternative_proxy_server) = 0;
// Returns the default alternative proxy server. May return an invalid proxy
// server if no valid proxy server is available.
virtual ProxyServer GetDefaultAlternativeProxy() const = 0;