44.6. Introduction to Access Control Lists
ACLs (access control lists) are possibly Squid's most powerful feature. An ACL is simply a test that is applied to a client request to see if it matches or not. Then, based on the ACLs that each request matches, you can choose to block it, prevent caching, force it into a delay pool, or hand it off to another proxy server. Many different types of ACL exist—for example, one type checks a client's IP address, another matches the URL being requested, and others check the destination port, web server hostname, authenticated user, and so on.
The most common use of ACLs is to block connections from clients outside your network. If you run a proxy server that is connected to and accessible from the Internet, ...
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