Essentially the module implements Apache's
URI-translation phase by attempting to use some or all of the URL
hostname and port number as the base of the URI. It simply does file
and directory existence tests on a series of URIs (from most-specific
to least-specific) and sets the URI to the most specific match.
For example, if the request is:
Apache::AddHostPath would go through the following
list of possible paths and set the new URI based on the first match
that passes a -f or -d
Available from CPAN. See the module manpage for more information.