HTTP/1.1 200 OK
Server: Apache
Date: Wed, 09 Dec 2015 03:29:14 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive

<html>
  <head>
    <title>Test</title>
    <link rel="pingback" href="http://pingback.example.com/success">
  </head>
  <body class="h-entry">
    <p class="e-content">This has a pingback endpoint that will return success</p>
  </body>
</html>