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    <title>Network Monitor test page</title>
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  <body>
    <p>Performing requests of various methods, with or without payload.</p>

    <script type="text/javascript">
      /* exported performRequest */
      "use strict";

      function performRequest(url, method, payload = null) {
        const xhr = new XMLHttpRequest();
        xhr.open(method, url, true);
        xhr.setRequestHeader("Accept-Language", window.navigator.language);
        xhr.setRequestHeader("X-Custom-Header-1", "Custom value");
        xhr.setRequestHeader("X-Custom-Header-2", "8.8.8.8");
        xhr.setRequestHeader("X-Custom-Header-3", "Mon, 3 Mar 2014 11:11:11 GMT");
        xhr.send(payload);
      }
    </script>
  </body>

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