This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
I suppose you don't know what "serve" means in the web context. It means to send a resource from the server to the client. The client doesn't use the filter, only the container does. So there is no need for the container to serve it.