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From <>
Subject Re: request_rec question
Date Tue, 17 Jul 2001 15:31:31 GMT
On Tue, 17 Jul 2001, Ian Holsman wrote:

> wrote:
> >On Tue, 17 Jul 2001, Brian Pane wrote:
> >
> >>Is there anything that actually uses the
> >>headers_out or err_headers_out fields in
> >>the request_rec that's created for a subrequest?
> >>Anything written to these fields appears to
> >>be discarded upon completion of the subrequest.
> >>We could save a couple of apr_table_make calls
> >>per subrequest if the httpd didn't have to
> >>create these two tables.
> >>
> >
> >You can't save those calls, because that would require every module in the
> >world to check to see if the table had been made before it tried to add
> >something to it.  Remember that a sub-request goes through the same basic
> >logic as a real request.
> >
> so should we fix the code so that the headers_out/err_headers_out of a
> subrequest gets merged into
> the parents request?

Nope.  While a sub-request goes through the same logic, the headers from a
sub-request do not always apply equally to the main-line request.  I can
easily an instance where an output header on a sub-request, say Location,
doesn't apply to the main request.


Ryan Bloom               
Covalent Technologies

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