55 lines
1.7 KiB
HTML
55 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 images</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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<!--
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Use a child document to load the second stale image into because
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an image loaded into the same document will skip cache-control headers.
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See: https://html.spec.whatwg.org/#the-list-of-available-images
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-->
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<iframe id="child1" srcdoc=""></iframe>
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<iframe id="child2" srcdoc=""></iframe>
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<script>
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var request_token = token();
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let image_src = "resources/stale-image.py?token=" + request_token;
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let loadImage = async (document) => {
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let img = document.createElement("img");
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img.src = image_src;
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let loaded = new Promise(r => img.onload = r);
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document.body.appendChild(img);
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await loaded;
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return img;
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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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let img1 = await loadImage(document);
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assert_equals(img1.width, 16, "(initial version loaded)");
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let img2 = await loadImage(child1.contentDocument);
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assert_equals(img2.width, 16, "(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(image_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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let img3 = await loadImage(child2.contentDocument);
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assert_equals(img3.width, 256, "(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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