Discovering the Modules Available on the Server

# httpd -l

This command lists the compiled-in modules in your server binary and should return something similar to the following:

Compiled in modules:   core.c   prefork.c   http_core.c   mod_so.c

If you compiled Apache with loadable module support, your modules will be built as shared-libraries and placed by default in a directory named modules/ (Apache 2.x) or libexec/ (Apache 1.3). To take a look at what shared modules are loaded into the server at runtime, you will need to take a look at the httpd.conf file and look for the appropriate LoadModule directives. With Apache 2.1/2.2, this is not necessary, as httpd -M will list all modules including those loaded at runtime.