<!DOCTYPE HTML>
<html>

<head>
    <meta http-equiv="Content-Security-Policy" content="{{GET[csp]}}">
</head>

<body>
  <script nonce='abc'>
    window.addEventListener('securitypolicyviolation', function(e) {
      opener.postMessage('fail', '*');
    });

    window.location.href = "{{GET[url]}}";
  </script>
</body>

</html>