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<!DOCTYPE html>
<meta charset="utf-8">
<title>Tests Stale While Revalidate works for scripts</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/utils.js"></script>
<body>
<script>
const request_token = token();
const script_src = "./resources/stale-script.py?token=" + request_token;
// The script above will call report() via a uniquely generated ID on the
// subresource. If it is a cache hit, the ID will be the same and
// |last_modified_count| won't be incremented.
let last_modified;
let last_modified_count = 0;
function report(mod) {
if (last_modified == mod)
return;
last_modified = mod;
last_modified_count++;
}
let loadScript = async () => {
let script = document.createElement("script");
let script_loaded = new Promise(r => script.onload = r);
script.src = script_src;
document.body.appendChild(script);
await script_loaded;
};
promise_test(async t => {
await new Promise(r => window.onload = r);
await loadScript();
assert_equals(last_modified_count, 1, '(initial version loaded)');
await loadScript();
assert_equals(last_modified_count, 1, '(stale version loaded)');
// Query the server again and again. At some point it must have received the
// revalidation request. We poll, because we don't know when the revalidation
// will occur.
while(true) {
await new Promise(r => step_timeout(r, 25));
let response = await fetch(script_src + "&query");
let count = response.headers.get("Count");
if (count == '2')
break;
}
await loadScript();
assert_equals(last_modified_count, 2, '(revalidated version loaded)');
}, 'Cache returns stale resource');
</script>
</body>
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