Hi, Consider the following setup: ------------------------------ ServerA (Apache, PHP) ServerB (Squid) ServerC (Squid) ServerD (Squid) ------------------------------ ServerA will execute the php scripts and set the last modified header, and user can get the cache from ServerB, C, D if cache is valid. Otherwise, B, C, D will proxy the request to A for dynamic execution. However, user might perform some update on the master (ServerA), and the cache on B, C, &D will needed to be cleared manually (even not expire). How to do this, maybe in PHP? Thanks.
