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>
  </head>
  <body class="h-entry">
    <a href="http://example.com/100" class="u-in-reply-to">in reply to</a>
    <div class="u-in-reply-to h-cite">
      <a href="http://example.com/100" class="u-url">this post</a>
    </div>
    <p class="e-content">This page has duplicate in-reply-to values.</p>
    <a href="/duplicate-in-reply-to-urls" class="u-url">permalink</a>
  </body>
</html>