signed-exchange/sxg-prefetch.tentative.https.html

<!DOCTYPE html>
<title>Prefetched signed exchange and certificate must not be fetched again</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<script src="/common/utils.js"></script>
<script src="./resources/sxg-util.js"></script>
<body>
<script>
promise_test(async (t) => {
  const id = token();
  const sxgUrl = get_host_info().HTTPS_REMOTE_ORIGIN + '/signed-exchange/resources/prefetch-test-sxg.py?id=' + id;

  await new Promise(resolve => {
    const link = document.createElement('link');
    link.rel = 'prefetch';
    link.href = sxgUrl;
    link.as = 'document';
    link.addEventListener('error', t.step_func(() => {
        assert_unreached('Prefetch should not fail');
    }));
    link.addEventListener('load', t.step_func(() => {
        resolve();
    }));
    document.body.appendChild(link);
  });
  const message_promise = new Promise((resolve) => {
    window.addEventListener('message', (event) => {
      resolve(event.data);
    }, false);
  });
  const win = window.open(sxgUrl, "_blank");
  const message = await message_promise;
  win.close();
  assert_equals(message, 'loaded');
}, 'Prefetched signed exchange and certificate must not be fetched again.');

</script>
</body>