44.9. Setting Up Proxy Authentication
Even though it is possible to configure Squid to allow access only from certain IP addresses, you may want to force clients to authenticate themselves to the proxy as well. This might make sense if you want to give only certain people access to the web and cannot use IP address validation due to the use of dynamically assigned addresses on your network. It is also handy for keeping track of who has requested what through the proxy as usernames are recorded in the Squid logs.
All browsers and programs that can make use of a proxy also support proxy authentication. Browsers will pop up a login window for entering a username and password that are to be sent to the proxy the first time it requests them, and automatically ...
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