This module allows parsing the output of other stacked mod_perl handlers in the Apache 1.3 http server that has compiled in mod_perl with PERL_STACKED_HANDLERS enabled.
You probably want to check the Apache::Filter module on CPAN, or use Apache 2+ and mod_perl 1.99+ and their native filtering features.
The latest distribution is Apache-OutputChain-0.11.tar.gz and it includes the following man pages:
Copyright: (c) 1997--2002 Jan Pazdziora.
All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.