Until now we have not mentioned a lot about what the Library actually can do. The fact is that the core part of libwww actually doesn't do much. All the functionality must be registered by the application - in orther words - the application programmer builds a libwww profile for an application by registrering a specific set of protocol modules, callbacks and filters.
The libwww distribution package somes with a large set of standard filters. These are filters that can be used in most applications and will do 80% of the job. The standard filters cover the following functions
Proxy and Gateway redirection
Memory and Persistent cache
Rule Files
Logging
Error Message Generation
Redirection
Authentication
In some situations, you can not use the standard filters
A great way extending the fucntionallity of your application is to write a new filter that can either be hooked in globally or locally depending on its nature.
@(#) $Id: Filters.html,v 1.1 1996/07/19 07:44:18 frystyk Exp $