Description:

This module is a very simple, lightweight method of setting up a single signon
system across multiple web-applicaitions hosted on different servers.

The actual authentication & authorization system is deployed on a single server
instead of each individual server. All other servers are built with
mod_auth_remote enabled. When a request comes in, mod_auth_remote obtains the
client username & password from the client via basic authentication scheme.

It then builds a HTTP header with authorization header built from the client's
userid:passwd. mod_auth_remote then makes a HEAD request to the authentication
server. On reciept of a 2XX response, the client is validated; for all other
responses the client is not validated.