access-control-basic-get-fail-non-simple.htm

<!DOCTYPE html>
<html>
  <head>
    <title>Tests CORS denying preflighted request to resource without CORS headers for OPTIONS</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">
    test(function() {
      const xhr = new XMLHttpRequest;

      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
          "/xhr/resources/access-control-basic-options-not-supported.py", false);

      // Non-CORS-safelisted header
      xhr.setRequestHeader("x-test", "foobar");

      // This fails because the server-side script is not prepared for an OPTIONS request
      assert_throws_dom("NetworkError", () => xhr.send());
      assert_equals(xhr.status, 0);
    }, "Preflighted cross-origin request denied");
    </script>
  </body>
</html>

chromium/third_party/blink/web_tests/external/wpt/xhr/access-control-basic-get-fail-non-simple.htm