speculation-rules/prefetch/prefetch-uses-cache.sub.https.html

<!DOCTYPE html>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/utils.js"></script>
<script src="/common/dispatcher/dispatcher.js"></script>
<script src="../resources/utils.js"></script>
<script src="resources/utils.sub.js"></script>

<meta name="variant" content="?same-site">
<meta name="variant" content="?cross-site">

<script>
setup(() => assertSpeculationRulesIsSupported());

promise_test(async t => {
  const is_same_site = location.search === '?same-site';
  const initiator = await spawnWindow(t);
  const url1 = initiator.getExecutorURL({
    hostname: is_same_site ? undefined : '{{hosts[alt][www]}}',
    page: 1,
    pipe: 'header(Cache-Control,private\\,max-age=604800)'
  });
  const url2 = initiator.getExecutorURL({
    hostname: is_same_site ? undefined : '{{hosts[][]}}',
    page: 2,
    pipe: 'header(Cache-Control,private\\,max-age=604800)'
  });

  await initiator.forceSinglePrefetch(url1);
  initiator.navigate(url2);
  assert_equals(await initiator.getDeliveryType(), '');
  assert_not_prefetched(await initiator.getRequestHeaders(),
                        'Content should not have been prefetched.');

  initiator.navigate(url1);
  if (is_same_site) {
    assert_equals(await initiator.getDeliveryType(), 'cache',
      'Navigation should have retrieved the response from the HTTP Cache.');
    // Note: Even though we didn't use a prefetch, the cached response for
    // |url1| was obtained using a prefetch request, and the recorded headers
    // at the time of the first request would have Sec-Purpose: 'prefetch'.
    assert_prefetched(await initiator.getRequestHeaders(),
      'The cached response should have been from the initial prefetch request.');
  } else {
    assert_equals(await initiator.getDeliveryType(), '',
      'Navigation response should not have been from the HTTP Cache.');
  }


  await initiator.forceSinglePrefetch(url2);
  initiator.navigate(url2);
  assert_equals(await initiator.getDeliveryType(), 'navigational-prefetch',
    'Navigation should have used the prefetch');
  if (is_same_site) {
    // Note: Even though we did use a prefetch, the recorded request headers in
    // the response will not be prefetch headers. This is because the prefetch
    // request retrieved its response from the HTTP cache, and the response in
    // the cache was initially obtained from the first navigation to |url2|,
    // which was not a prefetch.
    assert_not_prefetched(await initiator.getRequestHeaders(),
      'The prefetch request should have used a response from the HTTP cache.');
  } else {
    assert_prefetched(await initiator.getRequestHeaders(),
      'The prefetch request should have used a fresh response');
  }

}, 'Test that prefetches use/store responses to/from the HTTP cache.');
</script>