suppose i wanted to run a subrequest, but instead of outputting the body (or headers, or anything) of that request down the wire, i wanted to snag it for processing in another handler. i tried writing a filter that gathered the content and stuck it in $f->r->prev->notes, but it still flushes the headers of the main request. what would be the most appropriate way to go about doing this kind of thing?
The flush that causes headers sent must be there in order to keep things proper.
I'm not sure if playing with $r->assbackwards(1) will help. http://perl.apache.org/docs/2.0/api/Apache/RequestRec.html#C_assbackwards_
But if you write an output connection filter than you can certainly do what you plan (you don't even need to run a sub-request).
http://perl.apache.org/docs/2.0/user/handlers/filters.html#Connection_Output_Filters
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