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<!DOCTYPE html>
<html>
  <head>
    <title>Tests that preflight requests returning invalid 501 status code result in error.</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;

      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-preflight-request-invalid-status.py?code=501");

      xhr.setRequestHeader("x-pass", "pass");

      xhr.onerror = test.step_func_done(function() {
        assert_equals(xhr.status, 0);
      });

      xhr.onload = test.unreached_func("Invalid 501 response to preflight should result in error.");

      xhr.send();
    }, "Request with 501 preflight response");
    </script>
  </body>
</html>