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<html>
  <head>
      <meta charset="utf-8"/>
      <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
      <meta http-equiv="Pragma" content="no-cache" />
      <meta http-equiv="Expires" content="0" />
      <title>SSE Inspection Test Page in iframe</title>
  </head>
  <body>
    <h1>SSE Inspection Test Page in Iframe</h1>
    <script type="text/javascript">
      "use strict";

      /* exported openConnection */
      function openConnection() {
        return new Promise(resolve => {
          const es = new EventSource("sse_backend.sjs");
          es.onmessage = function (e) {
            es.close();
            resolve();
          };
        });
      }
    </script>
  </body>
</html>
