http://www.perlmonks.org?node_id=308233


in reply to Apache::Filter and Apache::RegistryFilter

I thought the documentation of Apache::RegistryFilter described the usage of the filter as a filter chain. A wild guess is that you probably need to swap the order of your PerlHandler line, so that the registry filter appears at the end of the chain -
PerlHandler Apache::LC Apache::RegistryFilter