There's a server configuration variable 'PerlSendHeader'. Set it to 'off' to send your own headers (I believe, it's actually different on my server conf, but this is what the man page says).

This exact question and many exactly like it are answer in the mod_perl Guide (which appears to be down as I write this). This is one of the most frequently asked questions by people starting.

Also, 'man cgi_to_mod_perl'.

In reply to Re: Mod Perl Content Header Output by Hrunting
in thread Mod Perl Content Header Output by Sarq

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