The directory structure for this level is as follows: standard/ In this directory are the standard supported modules for Apache. Not all are compiled by default. proxy/ This houses the code for the proxy module for Apache. experimental/ In this directory we've placed some modules which we think provide some pretty interesting functionality, but which are still in the early stages of development and could evolve radically in the future. This code isn't supported officially. test/ This directory houses modules which test various components of Apache. You should not compile these into a production server. example/ This directory houses example modules, to help module authors figure their way around the Apache API and module concept.