Apache::SSLLookup is a glue layer between Perl handlers and the
mod_ssl public API. under normal circumstances, you would use
subprocess_env() to glean information about mod_ssl.
However, this is only possible after mod_ssl runs its fixups,
that is, Perl handlers can only accurately check the
subprocess_env table for mod_ssl information in the
PerlResponsePhase or later.
This module allows you to query mod_ssl directly via its public
C API at any point in the request cycle. but without using C,
of course.