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