I think that ICAP using respmod is the easiest way to do this... I guess that otherwise there is netfilter. Do you have language preferences? You say you want an easy way to do it; As I've always said, if you want something done easy, do it in python. I used the pyicap library to implement an ICAP content filter. It is ridiculously easy to use. https://github.com/netom/pyicap As far as transparent proxying is concerned this is possible in squid. -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/Simple-content-filter-by-external-program-tp4667230p4667232.html Sent from the Squid - Users mailing list archive at Nabble.com.