Hi, you are a bit late to detect this issue :-) youtube changed this already some months ago. Actually I can not do further research, but also look here: http://squid-web-proxy-cache.1019090.n4.nabble.com/Do-we-have-an-algorithm-to-define-the-cachabillity-of-an-object-by-the-request-and-response-td4665473.html -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/Caching-not-working-for-Youtube-videos-tp4665486p4665488.html Sent from the Squid - Users mailing list archive at Nabble.com.