Thanks, I'll try that with Facebook,
Unfortunately right now I experiencing much critical issue with Squid,
Our reps using "helponclick.com" chat system,
For some reason even though I added this domain to their whitelist (and contacted the manufacture to make sure all their servers\subdomains are under this domain), we still experienced slowness, delays and losing chats.
To make it run faster and less buggy I tried to exclude this domain from being cashed ("do not cache" under "proxy server") but for some reason now they get the chat system very fast but with even more issues like:
Losing most of chats, can't see who's online on the website, visitors sometimes get "no available representative" message and such...
In the log I don't see any mention to helponclick.
The information their support gave me: all servers sub-domains are under the same domain name, only ports you need are 80 and 443 and requests are performed by AJAX (I don't know if squid can make issues with AJAX).
Many (many) thanks!