HTTP/1.1 200 OK
Server: nginx
Date: Sat, 17 Nov 2012 20:15:09 GMT
Content-Type: text/xml; charset=UTF-8
Content-Length: 317
Connection: keep-alive
X-hacker: If you're reading this, you should visit automattic.com/jobs and apply to join the fun, mention this header.
<?xml version="1.0" encoding="UTF-8"?>
<methodResponse>
<params>
<param>
<value>
<string>Pingback from http://p.cweiske.de/21?foobar to http://pingbacktest.wordpress.com/2008/01/15/hello-world/ registered. Keep the web talking! :-)</string>
</value>
</param>
</params>
</methodResponse>
Welcome onboard: http://pingbacktest.wordpress.com/2008/01/15/hello-world/ is there.
Another link: http://cweiske.de/tagebuch/