You haven't provided any details about how you've configured Apache, but I'm guessing that you're trying to use both mod_cgi and mod_perl for the PerlResponseHandler, and I don't think that will work.
If you're using the mod_perl handler to check the cookie, why not put it into a separate phase, such as PerlAccessHandler. See the HTTP Handler docs for details.
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Want more info? How to link
or How to display code and escape characters
are good places to start.