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<!DOCTYPE html>
<meta charset=utf-8>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="early-hints-helpers.sub.js"></script>
<body>
<script>
const SEARCH_PARAMS = new URLSearchParams(window.location.search);
const REFERRER_POLICY = SEARCH_PARAMS.get("referrer-policy");
async function get_fetch_timing_and_headers(url_string) {
const url = new URL(url_string);
const id = url.searchParams.get("id");
if (id === null) {
throw new Error(`"${url.href}" does not contain id parameter`);
}
const response = await fetch(`${url.origin}/loading/early-hints/resources/get-fetch-timing-and-headers.h2.py?id=${id}`);
const json = await response.json();
return json;
}
function get_expected_referrer(is_same_origin) {
const full = window.location.href;
const origin = self.origin + "/";
// There is no support for security level related policies such as
// "no-referrer-when-downgrade" since the test is available only on HTTP/2.
switch (REFERRER_POLICY) {
case "no-referrer":
return undefined;
case "origin":
return origin;
case "origin-when-cross-origin":
return is_same_origin ? full : origin;
case "same-origin":
return is_same_origin ? full : undefined;
case "unsafe-url":
return full;
default:
throw new Error(`Unsupported referrer policy: ${REFERRER_POLICY}`);
}
}
async function check_referrer(url, expected_referrer) {
await fetchScript(url);
const { headers } = await get_fetch_timing_and_headers(url);
assert_equals(headers["referer"], expected_referrer);
const name = new URL(url, window.location);
assert_true(isPreloadedByEarlyHints(name));
}
promise_test(async (t) => {
const same_origin_preload_url = SEARCH_PARAMS.get("same-origin-preload-url");
const same_origin_expected = get_expected_referrer(true);
await check_referrer(same_origin_preload_url, same_origin_expected);
const cross_origin_preload_url = SEARCH_PARAMS.get("cross-origin-preload-url");
const cross_origin_expected = get_expected_referrer(false);
await check_referrer(cross_origin_preload_url, cross_origin_expected);
}, `Referrer policy: ${REFERRER_POLICY}`);
</script>
</body>
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