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Test Info:

<!DOCTYPE html>
<title>Ensures that prefetch respects HTTP cache semantics</title>
<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>
async function prefetch_and_count(cacheControl, t) {
const {href} = await prefetch({
"cache-control": cacheControl,
"type": "application/javascript",
content: "/**/"}, t);
const script = document.createElement("script");
script.src = href;
t.add_cleanup(() => script.remove());
const loaded = new Promise(resolve => script.addEventListener("load", resolve));
await loaded;
const info = await get_prefetch_info(href);
return info.length;
promise_test(async t => {
const result = await prefetch_and_count("max-age=604800", t);
assert_equals(result, 1);
}, "Prefetch should populate the HTTP cache");
for (const cacheControl of ["no-cache", "no-store", "max-age=0"]) {
promise_test(async t => {
const result = await prefetch_and_count(cacheControl, t);
assert_equals(result, 2);
}, `Prefetch should respect cache-control: ${cacheControl}`);