<!DOCTYPE html>
<!--
  This test verifies presence of Sec-Fetch-... request headers on a request
  handled by a service worker - this test covers the scenario when the service
  worker doesn't do anything and the request falls back to the network.
-->
<meta charset="utf-8"/>
<link rel="author" href="lukasza@chromium.org" title="Lukasz Anforowicz">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=/fetch/metadata/resources/helper.js></script>
<script src=/service-workers/service-worker/resources/test-helpers.sub.js></script>
<script src=/common/utils.js></script>
<script>
    const nonce = token();
    const key = "fetch-via-serviceworker--fallback--" + nonce;

    promise_test(async function(t) {
        const SCOPE = 'resources/fetch-via-serviceworker--fallback--frame.html';
        const SCRIPT = 'resources/fetch-via-serviceworker--fallback--sw.js';
        const URL = '/fetch/metadata/resources/record-header.py?file=' + key;
        const RETRIEVAL_URL = "/fetch/metadata/resources/record-header.py?retrieve=true&file=" + key;

        const reg = await service_worker_unregister_and_register(t, SCRIPT, SCOPE);
        t.add_cleanup(async () => {
          if (reg)
            await reg.unregister();
        });

        await wait_for_state(t, reg.installing, 'activated');

        const frame = await with_iframe(SCOPE);
        t.add_cleanup(async () => {
          if (frame)
            frame.remove();
        });

        // Trigger a fetch that 1) will go through the service worker and 2) will
        // fetch a special URL that records request headers.
        await frame.contentWindow.fetch(URL, {mode:'no-cors'});

        // Retrieve the request headers that have been recorded in the previous step.
        const response = await fetch(RETRIEVAL_URL);
        const text = await response.text();

        // Verify presence of the expected Sec-Fetch-... request headers.
        let expected = {"site":"same-origin", "user":"", "mode": "no-cors", "dest": "empty"};
        assert_header_equals(text, expected);
      }, 'Sec-Fetch headers after SW fallback');
</script>