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<title>Use for navigation the requested prefetched response annotated with No-Vary-Search hint, if
No-Vary-Search headers also match during navigation</title>
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<script src="hint-test-inputs.js"></script>
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<script>
setup(() => assertSpeculationRulesIsSupported());
/*
remoteAgent: the RemoteContext instance used to communicate between the
test and the window where prefetch/navigation is happening
noVarySearchHeaderValue: the value of No-Vary-Search header to be populated
for the prefetched response
noVarySearchHintValue: the value of No-Vary-Search hint passed in
as expects_no_vary_search hint in prefetch speculation rules.
prefetchQuery: query params to be added to prefetchExecutor url and prefetched
navigateQuery: query params to be added to prefetchExecutor url and navigated to
*/
async function prefetchAndNavigate(remoteAgent, noVarySearchHeaderValue, noVarySearchHintValue, prefetchQuery, navigateQuery){
/*
Flow:
* prefetch prefetch_nvs_hint.py?uuid=...&nvs_header=...&otherqueryparams
* the prefetch request above includes no_vary_search_hint in the speculation
rules
* the server blocks progress on this prefetch request on the server side so
from the browser perspective the server is "thinking"
* the test starts navigation to
prefetch_nvs_hint.py?uuid=...&nvs_header=...&otherdifferentqueryparams.
This navigation matches by No-Vary-Search hint the above in
progress prefetch.
* the test fetches prefetch_nvs_hint.py?uuid=...&unblock="unblock"
which unblocks the in progress prefetch so that the in-progress
navigation can continue
*/
const prefetch_nvs_hint_server_page = "prefetch_nvs_hint.py";
const prefetchUrl = remoteAgent.getExecutorURL({executor:prefetch_nvs_hint_server_page});
const navigateToUrl = new URL(prefetchUrl);
// Add query params to the url to be prefetched.
const additionalPrefetchedUrlSearchParams = new URLSearchParams(prefetchQuery);
addNoVarySearchHeaderUsingQueryParam(prefetchUrl, noVarySearchHeaderValue);
additionalPrefetchedUrlSearchParams.forEach((value, key) => {
prefetchUrl.searchParams.append(key, value);
});
await remoteAgent.forceSinglePrefetch(prefetchUrl,
{expects_no_vary_search:noVarySearchHintValue});
// Add new query params to navigateToUrl to match No-Vary-Search test case.
const additionalNavigateToUrlSearchParams = new URLSearchParams(navigateQuery);
addNoVarySearchHeaderUsingQueryParam(navigateToUrl, noVarySearchHeaderValue);
additionalNavigateToUrlSearchParams.forEach((value, key) => {
navigateToUrl.searchParams.append(key, value);
});
// Url used by fetch in order to unblock the prefetched url
const nvshint_unblock_url = remoteAgent.getExecutorURL(
{executor:prefetch_nvs_hint_server_page, unblock:"unblock"});
await remoteAgent.execute_script((unblock_url) => {
onbeforeunload = (event) => {
fetch(unblock_url);
};
}, [nvshint_unblock_url]);
// Try navigating to a non-exact prefetched URL that matches by
// No-Vary-Search hint
// Wait for the navigation to finish
await remoteAgent.navigate(navigateToUrl);
}
function prefetch_no_vary_search_test(description, noVarySearch, noVarySearchHint, prefetchQuery, navigateQuery, shouldUse){
promise_test(async t => {
const agent = await spawnWindow(t, {});
await prefetchAndNavigate(agent,
noVarySearch,
noVarySearchHint,
prefetchQuery,
navigateQuery);
if (shouldUse) {
assert_prefetched(await agent.getRequestHeaders(),
"Navigation didn't use the prefetched response!");
}
else{
assert_not_prefetched(await agent.getRequestHeaders(),
"Navigation used the prefetched response!");
}
}, description);
}
hint_test_inputs.forEach(({description, noVarySearch, noVarySearchHint, prefetchQuery, navigateQuery, shouldUse}) => {
subsetTest(prefetch_no_vary_search_test,
description, noVarySearch, noVarySearchHint, prefetchQuery, navigateQuery,
shouldUse);
});
</script>
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