does squidguard and proxy save https request?
How do i empty the cache?
By default, squid does not cache HTTPS requests. I am not even sure if Squid can be set up to do this. http://squid-cache.org
I believe you can empty the cache by deleting the contents of var/squid/cache and then rebooting or restarting the service. You might have to run squid -z, search this forum for more info on that.