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<!DOCTYPE html>
<title>Ensures that prefetch respects HTTP cache semantics</title>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/utils.js"></script>
<script src="resources/prefetch-helper.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<body>
<script>
const {REMOTE_ORIGIN} = get_host_info();
async function prefetch(link, uid, t) {
link.rel = "prefetch";
document.head.appendChild(link);
const event = new Promise(resolve => {
link.addEventListener("error", () => resolve("error"));
link.addEventListener("load", () => resolve("load"));
t.step_timeout(() => resolve("timeout"), 1000);
});
return await event;
}
promise_test(async t => {
const uid = token();
const link = document.createElement("link");
link.href = `/preload/resources/prefetch-info.py?key=${uid}`;
const event = await prefetch(link, uid, t);
assert_equals(event, "load");
}, "Prefetch should fire the load event");
promise_test(async t => {
const uid = token();
const link = document.createElement("link");
link.href = `${REMOTE_ORIGIN}/preload/resources/prefetch-info.py?key=${uid}`;
const event = await prefetch(link, uid, t);
assert_equals(event, "load");
}, "Cross-origin prefetch should fire the load event");
promise_test(async t => {
const uid = token();
const link = document.createElement("link");
link.href = `/preload/resources/prefetch-info.py?key=${uid}&status=404`;
const event = await prefetch(link, uid, t);
assert_equals(event, "load");
}, "Prefetch should fire the load event for 404");
promise_test(async t => {
const uid = token();
const link = document.createElement("link");
link.href = `${REMOTE_ORIGIN}/preload/resources/prefetch-info.py?key=${uid}&status=404`;
const event = await prefetch(link, uid, t);
assert_equals(event, "load");
}, "Prefetch should fire the load event for 404 (cross-origin)");
promise_test(async t => {
const uid = token();
const link = document.createElement("link");
link.href = `/preload/resources/prefetch-info.py?key=${uid}&status=500`;
const event = await prefetch(link, uid, t);
assert_equals(event, "load");
}, "Prefetch should fire the load event for 500");
promise_test(async t => {
const uid = token();
const link = document.createElement("link");
link.href = `${REMOTE_ORIGIN}/preload/resources/prefetch-info.py?key=${uid}&status=500`;
const event = await prefetch(link, uid, t);
assert_equals(event, "load");
}, "Cross-origin prefetch should fire the load event for 500");
promise_test(async t => {
const uid = token();
const link = document.createElement("link");
link.crossOrigin = "anonymous";
link.href = `${REMOTE_ORIGIN}/preload/resources/prefetch-info.py?key=${uid}&cors=false`;
const event = await prefetch(link, uid, t);
assert_equals(event, "error");
}, "Prefetch should fire the error event for network errors");
promise_test(async t => {
const uid = token();
const link = document.createElement("link");
link.crossOrigin = "anonymous";
const event = await prefetch(link, uid, t);
assert_equals(event, "timeout");
}, "Prefetch should do nothing with an empty href");
promise_test(async t => {
const uid = token();
const link = document.createElement("link");
link.href = "https://example.com\u0000mozilla.org";
link.crossOrigin = "anonymous";
const event = await prefetch(link, uid, t);
assert_equals(event, "timeout");
}, "Prefetch should do nothing with an invalid href");
</script>
</body>
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