access-control-basic-post-with-non-cors-safelisted-content-type.htm

<!DOCTYPE html>
<html>
  <head>
    <title>Non-CORS-safelisted value in the Content-Type header results in a request preflight</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("POST", get_host_info().HTTP_ORIGIN +
          "/xhr/resources/access-control-basic-options-not-supported.py", false);

      xhr.setRequestHeader("Content-Type", "application/xml");

      xhr.send();

      assert_equals(xhr.status, 200, "Same-origin access doesn't issue preflight; not denied.");
    }, "Same-origin request with non-safelisted content type succeeds");

    test(function() {
      const xhr = new XMLHttpRequest;

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

      xhr.setRequestHeader("Content-Type", "application/xml");

      assert_throws_dom("NetworkError", () => xhr.send());
      assert_equals(xhr.status, 0, "Cross-domain access was denied in 'send'.");
    }, "CORS request with non-safelisted content type sends preflight and fails");
    </script>
  </body>
</html>

chromium/third_party/blink/web_tests/external/wpt/xhr/access-control-basic-post-with-non-cors-safelisted-content-type.htm