index.html

<!DOCTYPE html>
<html lang="en">

<head>

  <meta charset="utf-8" />

  <title>SGHPA Demo</title>

  <style type="text/css">
    body:before {
      content: attr(message);
    }
  </style>

</head>

<body>

  <script>
    (function(){
      var redirect = sessionStorage.redirect;
      delete sessionStorage.redirect;
      if (redirect && redirect != location.href) {
        history.replaceState(null, null, redirect);
        // REMOVE THIS - just showing the redirect route in the UI
        document.body.setAttribute('message', 'This page was redirected by 404.html, from the route: ' + redirect);
      }
      else {
        // REMOVE THIS - just showing the redirect route in the UI
        document.body.setAttribute('message', 'This page was loaded directly from the index.html file');
      }
    })();
  </script>

</body>


</html>