<!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-contro