speculation-rules/prefetch/referrer-policy.https.html

<!DOCTYPE html>
<title>Prefetch is done with the referring page's referrer policy</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/dispatcher/dispatcher.js"></script>
<script src="/common/subset-tests.js"></script>
<script src="/common/utils.js"></script>
<script src="../resources/utils.js"></script>
<script src="resources/utils.sub.js"></script>

<!--Split test cases due to the use of timeouts in speculation rules test utilities.-->
<meta name="variant" content="?1-1">
<meta name="variant" content="?2-2">
<meta name="variant" content="?3-3">
<meta name="variant" content="?4-last">

<script>
"use strict";

setup(() => assertSpeculationRulesIsSupported());

subsetTest(promise_test, async t => {
  const agent = await spawnWindow(t);
  await agent.setReferrerPolicy("strict-origin-when-cross-origin");
  const expectedReferrer = agent.getExecutorURL().href;

  const nextURL = agent.getExecutorURL({ page: 2 });
  await agent.forceSinglePrefetch(nextURL);
  await agent.navigate(nextURL);

  const headers = await agent.getRequestHeaders();
  assert_prefetched(headers, "must be prefetched");
  assert_equals(headers.referer, expectedReferrer, "must send the full URL as the referrer");
}, 'with "strict-origin-when-cross-origin" referrer policy');

subsetTest(promise_test, async t => {
  const agent = await spawnWindow(t);
  await agent.setReferrerPolicy("strict-origin");
  const expectedReferrer = agent.getExecutorURL().origin + "/";

  const nextURL = agent.getExecutorURL({ page: 2 });
  await agent.forceSinglePrefetch(nextURL);
  await agent.navigate(nextURL);

  const headers = await agent.getRequestHeaders();
  assert_prefetched(headers, "must be prefetched");
  assert_equals(headers.referer, expectedReferrer, "must send the origin as the referrer");
}, 'with "strict-origin" referrer policy');

subsetTest(promise_test, async t => {
  const agent = await spawnWindow(t);
  await agent.setReferrerPolicy("no-referrer");

  const nextURL = agent.getExecutorURL({ page: 2 });
  await agent.forceSinglePrefetch(nextURL);
  await agent.navigate(nextURL);

  const headers = await agent.getRequestHeaders();
  assert_prefetched(headers, "must be prefetched");
  assert_equals(headers.referer, undefined, "must send no referrer");
}, 'with "no-referrer" referrer policy');

subsetTest(promise_test, async t => {
  const agent = await spawnWindow(t);
  await agent.setReferrerPolicy("no-referrer");

  const next_url = agent.getExecutorURL({ page: 2 });
  await agent.execute_script((url) => {
    const a = addLink(url);
    a.referrerPolicy = 'strict-origin';
    insertDocumentRule();
  }, [next_url]);
  await new Promise(resolve => t.step_timeout(resolve, 2000));
  await agent.navigate(next_url);

  const headers = await agent.getRequestHeaders();
  const expected_referrer = next_url.origin + '/';
  assert_prefetched(headers, 'must be prefetched');
  assert_equals(headers.referer, expected_referrer);
}, 'with "strict-origin" link referrer policy overriding "no-referrer" of referring page');
</script>