Implementation

The WWW proxy caching system is written in C++ in the Linux environment. On the local machine, the user needs to run only one process, the local proxy server called localCache, in addition to the browser itself. On the backbone server, several processes need to be run. These are the backbone cache manager squid [4], the HTTP response filter filterd, the backbone pre-fetch engine pfetcher, the backbone group profile manager gpm, and the backbone communication surrogate bcs which talks to localCache. We will describe these processes in more detail next. It must be noted that other than squid [4], all the other processes can be combined into a single one that spawns into different modules. The use of different processes is purely to ease debugging. In essence, filterd and bcs keep states about the current session. The rest of the processes keep state about the backbone proxy server.