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.

extra/

This is the directory for third-party modules, such as mod_jserv.

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.