preload/prefetch-events.html

<!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>