mozilla-central/testing/web-platform/tests/speculation-rules/prefetch/prefetch-uses-cache.sub.https.html

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<!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]}}',
executor: 'cacheable-executor.sub.html',
page: 1
});
const url2 = initiator.getExecutorURL({
hostname: is_same_site ? undefined : '{{hosts[][]}}',
executor: 'cacheable-executor.sub.html',
page: 2
});
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>