A proxy server lies between client machines—the desktops in your company—and the Internet. As clients request websites, they do not connect directly to the Web and send the HTTP request. Instead, they connect to the local proxy server. The proxy then forwards their requests on to the Web, retrieves the result, and hands it back to the client. At its simplest, a proxy server really is just an extra layer between client and server, so why bother?
The three main reasons for deploying a proxy server are as follows:
• Content control—You want to prevent access to certain types of content.
• Speed—You want to cache common sites to make the most of your bandwidth.
• Security—You want to monitor what people are doing.
Squid accomplishes ...