<!DOCTYPE html>
<!-- This test cannot be upstreamed to WPT because it asserts a precise list
  of expected header names, but but such precision is not mandated by the
  relevant specifications. It should be maintained only to the extent that this
  precision is relevant to Chromium internals; the Web Platform Tests project
  includes a relaxed version which allows for additional headers. -->
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/test-helpers.js"></script>
<body>
<script>
var worker = 'resources/fetch-event-test-worker.js';

promise_test(function(t) {
    const scope = 'resources/simple.html?headers';
    return service_worker_unregister_and_register(t, worker, scope)
      .then(function(reg) {
          return wait_for_state(t, reg.installing, 'activated');
        })
      .then(function() { return with_iframe(scope); })
      .then(function(frame) {
          t.add_cleanup(function() { frame.remove(); });
          // We have this test to prevent unexpected exposure of headers to a
          // ServiceWorker. Feel free to rebaseline this expectation if it
          // looks good.
          const headers = JSON.parse(frame.contentDocument.body.textContent);
          const header_names = [];
          for (const [name, value] of headers) {
            header_names.push(name);
          }
          header_names.sort();
          assert_array_equals(
            header_names,
            ["accept", "upgrade-insecure-requests", "user-agent"],
            'event.request has the expected headers.');

          return service_worker_unregister_and_done(t, scope);
        });
  }, 'Service Worker headers in the request of a fetch event');
</script>
</body>