I'm running squid configured with basic authentication.
(acl all proxy_auth REQUIRED)
Each time a user connects he has to logon no matter which url he wants
to get.
Now I want to make special sites accessible without authentication. So
I want the logon dialog to pop up only if an non-free-site is
requested.

Is it possible?
What modifications must be done to the squid.conf?

Any help apreciated.
Thanx in advance

Björn