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<!DOCTYPE html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
</head>
<html>
<body>
  <p>Dummy Page</p>
  <script>
     let foo = async () => {
       await fetch(url, { mode: "no-cors" });
     }
     foo();
  </script>
</body>
</html>