access-control-preflight-request-header-sorted.htm

<!DOCTYPE html>
<html>
<head>
<title>Tests that Access-Control-Request-Headers are sorted.</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/get-host-info.sub.js"></script>
</head>
<body>
<script>
async_test((test) => {
  const xhr = new XMLHttpRequest();
  const url = get_host_info().HTTP_REMOTE_ORIGIN + '/xhr/resources/access-control-preflight-request-header-sorted.py';
  xhr.open('GET', url);
  xhr.setRequestHeader("X-Custom-Test", "foobar");
  xhr.setRequestHeader("X-Custom-ua", "foobar");
  xhr.setRequestHeader("X-Custom-V", "foobar");
  xhr.setRequestHeader("X-Custom-s", "foobar");
  xhr.setRequestHeader("X-Custom-U", "foobar");
  xhr.onerror = test.unreached_func('xhr failure');
  xhr.onload = test.step_func_done(() => {
    assert_equals(xhr.responseText, 'PASS');
  });
  xhr.send();
});
</script>
</body>
</html>

chromium/third_party/blink/web_tests/external/wpt/xhr/access-control-preflight-request-header-sorted.htm