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.