servo/tests/wpt/web-platform-tests/fetch/stale-while-revalidate/fetch.tentative.html

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HTML

<!DOCTYPE html>
<!---
Tentative test against:
https://github.com/whatwg/fetch/pull/853
-->
<meta charset="utf-8">
<title>Tests Stale While Revalidate is not executed for fetch API</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/utils.js"></script>
<script>
function wait25ms(test) {
return new Promise(resolve => {
test.step_timeout(() => {
resolve();
}, 25);
});
}
promise_test(async (test) => {
var request_token = token();
const response = await fetch(`stale-script.py?token=` + request_token);
const response2 = await fetch(`stale-script.py?token=` + request_token);
assert_equals(response.headers.get('Unique-Id'), response2.headers.get('Unique-Id'));
while(true) {
const revalidation_check = await fetch(`stale-script.py?query&token=` + request_token);
if (revalidation_check.headers.get('Count') == '2') {
break;
}
await wait25ms(test);
}
}, 'Second fetch returns same response');
</script>