ver.di is doing it right!

[root@unitedgamesfactory ~]# curl -I www.verdi.de
HTTP/1.1 200 OK
Server: nginx/0.6.11
Date: Tue, 21 Jun 2011 09:38:46 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive
Content-Length: 35103
Expires: Tue, 21 Jun 2011 09:24:48 GMT
Last-Modified: Tue, 21 Jun 2011 08:54:48 GMT
Cache-Control: max-age=1800
Age: 2638
X-Cache: HIT from www01.verdi.de
X-Cache-Lookup: HIT from www01.verdi.de:88