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From Torsten Förtsch <>
Subject Re: [mp2 ] Request output filters and directories
Date Tue, 22 Mar 2011 18:12:01 GMT
On Tuesday, March 22, 2011 15:43:07 Clément OUDOT wrote:
> Can this behaviour comes from the DirectoryIndex and mod_dir?

I assume you call add_output_filter in My::Package?

Now, mod_dir uses subrequests for all of your DirectoryIndex documents. The 
first it finds, it redirects to using ap_internal_fast_redirect(). This is a 
very hackish function that tries to magically turn the subreq into the main 
request. It copies a bunch of values from the subreq into the main req. One of 
these values is the output filter list. So, after the operation your main req 
looks mostly like the subreq.

Another detail that hits you here is that the HeaderParser phase is called 
only for the main request.

Now put these two together, you start a request for dir/. My::Package installs 
the output filter in its header parser phase. mod_dir jumps in and issues a 
subreq for dir/ The subreq skips the header parser phase. 
ap_internal_fast_redirect copies the output filter chain (without your filter) 
from the subreq to the main one. Your registry script is evaluated 
but the output filter is gone.

What could be done? I think the cleanest way would be to either move 
My::Package to another phase, fixup for example. If that's not possible you 
can set a flag in $r->pnotes when the filter in installed. Then you need a 
fixup handler that looks if the flag is set in $r->main->pnotes and reinstalls 
the filter if so.

Torsten Förtsch

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