I have a page, that adds a filter.... My question is what am I doing that headers aren't being sent?

What do you have? The filter/configuration bits are as important as self-contained code , because mason/mod_perl/apache ... too many details that need to be detailed (example of similar journey mod_perl give 404 not_found with content )

In reply to Re: Headers not being sent with mod_perl2 by Anonymous Monk
in thread Headers not being sent with mod_perl2 by smithd77

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