site/404.xml

<?xml-stylesheet type="text/xml" href="page.xsl"?>
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<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>Page not found - 404 Error</title>
  </head>
  <body>

  <p>The page you were looking for has not been found, please
  <a href="https://www.rabbitmq.com/contact.html">contact us</a>
  if you can't find what you're looking for using the links above.</p>

  <p>Thanks</p>

  </body>
</html>