It seems from the tcpdump that <img src="http://www.bitmover.com/gifs/bitkeeper-shadow.gif";> is requested by the proxy resulting in a 304 and then the same tcp connection is erroneously reused to request the www.wetter.com URL. tcpdump excerpt:
Since mod_cache doesn't actually fetch the pages, that would finger mod_proxy as the likely culprit. =)
I've yet to dig down into the mod_proxy code, so I'm little help. -- justin
![http://www.bitmover.com/gifs/bitkeeper-shadow.gif"](http://www.bitmover.com/gifs/bitkeeper-shadow.gif"){kind=link}