On 21/07/2016 7:43 p.m., FredB wrote: > Thanks Amos for your answer > Do you think I can use an alternate method to tag my users requests ? Modifiy/add Header seems a bad idea > If its just between proxies, using HTTP messages. Then header should be usable. This only falls over when you have non-HTTP hops involved. eg, thats exactly how the X-Forwarded-For, Forwarded, and Via headers are designed to operate. TOS is the only way from Squid to send custom signals across non-HTTP connections between machines. But Squid itself cannot receive the TOS values. So that gets tricky. Amos _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users