Hey Omid, The issue is that the docs are unclear to *me* and I suspect that I will need to quote them: acl aclname rep_header header-name [-i] any\.regex\.here # regex match against any of the known reply headers. May be # thought of as a superset of "browser", "referer" and "mime-type" # ACLs [fast] Which to me means that it works only against "any of the known reply headers" but not special ones. It would be a bit weird if it is indeed the state but it's probably it. This is the place to lower my hat and say: I do not know what to tell you! I can try to research and read code but there are others which can answer better then me on this one. Eliezer ---- Eliezer Croitoru Linux System Administrator Mobile: +972-5-28704261 Email: eliezer@xxxxxxxxxxxx -----Original Message----- From: squid-users [mailto:squid-users-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Omid Kosari Sent: Monday, July 18, 2016 5:42 PM To: squid-users@xxxxxxxxxxxxxxxxxxxxx Subject: rep_header not working Hello, It seems rep_header does not work at all. acl mshit rep_header X-SHMSCDN . acl mshit rep_header Content-Type -i text\/html acl html rep_header Content-Type -i ^text\/html acl apache rep_header Server ^Apache debug_options 28,3 Other types of acl works fine the log is very huge because of thousands of clients . Squid Object Cache: Version 3.5.19 Official Debian Package Ubuntu Linux 16.04 4.4.0-28-generic on x86_64 -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/rep-header-not-working-tp4678561.html Sent from the Squid - Users mailing list archive at Nabble.com. _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users