access-control-preflight-request-headers-origin.htm

<!DOCTYPE html>
<html>
  <head>
    <title>Test that 'Origin' is not included in Access-Control-Request-Headers in a preflight request</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 type="text/javascript">
async_test((test) => {
  const xhr = new XMLHttpRequest;
  const url = get_host_info().HTTP_REMOTE_ORIGIN +
      "/xhr/resources/access-control-preflight-request-headers-origin.py";

  xhr.open("GET", url);
  xhr.setRequestHeader("x-pass", "PASS");

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

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

  xhr.send();
}, "'Origin' should not be included in CORS Request-Headers");
    </script>
  </body>
</html>

chromium/third_party/blink/web_tests/external/wpt/xhr/access-control-preflight-request-headers-origin.htm