File: access-control-preflight-headers-async.htm

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<!DOCTYPE html>
<html>
  <head>
    <title>Test that async CORS requests with custom headers are sent with OPTIONS preflight</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>
  </head>
  <body>
    <script type="text/javascript">
async_test((test) => {
  let xhr = new XMLHttpRequest;
  const uuid = token();

  xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
      "/xhr/resources/reset-token.py?token=" + uuid, false);
  xhr.send();

  xhr = new XMLHttpRequest;
  xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
      "/xhr/resources/no-custom-header-on-preflight.py?token=" + uuid);
  xhr.setRequestHeader("x-test", "foobar");

  xhr.onerror = test.unreached_func("Unexpected error");

  xhr.onload = test.step_func_done(() => {
    assert_equals(xhr.responseText, "PASS");
  });

  xhr.send();
}, "Preflighted async request with custom header");
    </script>
  </body>
</html>