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Backporting the following from Apache 2.1-dev to 2.0.49-dev:

  *) Add a hook (insert_error_filter) to allow filters to re-insert
     themselves during processing of error responses. Enable mod_expires
     to use the new hook to include Expires headers in valid error
     responses. This addresses an RFC violation. It fixes PRs 19794,
     24884, and 25123.

Reviewed by: trawick, stoddard


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PR:
Obtained from:
Submitted by:
Reviewed by:


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Submitted by:	Tomasz Kepczynski <tomek jot23.org>


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(see HEAD r1.5).


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PR:
Obtained from:
Submitted by:
Reviewed by:


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PR: 25875


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(not currently supported for Win32, BeOS, or OS/2 MPMs)

Submitted by:	Jeff Trawick, Brad Nicholes
Reviewed by:	stoddard, jerenkrantz


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Distributing the mod_include overhaul is clearly the way to
shake out any remaining mod_include issues, for 2.0 *and* 2.2.
Thanks for all your work on this!


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report.

Submitted by:	Joe Orton
Reviewed by:	trawick, ianh, jerenkrantz


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cast some votes on those with less than 3 +1s.

(One or two of them I voted for are now at 3 +1s, but for some stated reason
or another, I'm not backporting them.)


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If -n is specified and we have a comment, print the comment out too.

Backup of support/htdbm.c r1.11 from httpd-2.1
Submitted by:	Justin Erenkrantz
Reviewed by:	Justin Erenkrantz, Sander Striker, Jeff Trawick, Ian Holsman


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problems with content-length-modifying input filter (like deflate).

revision 1.99:
drop the test, whether apr_brigade_create returns NULL. It does never
(dumps core instead :-)

Submitted by: Cliff Woolley

revision 1.100:
get rid of _FOREACH
Submitted by: Cliff Woolley

(Needed 1.100 too as APR_BRIGADE_FOREACH is now gone in APR-util 1.0+.)

Backport of modules/dav/main/mod_dav.c r1.98, r1.99, r1.100
PR: 22104
Some stuff submitted by: tim@robbins.dropbear.id.au (Tim Robbins)
Reviewed by:	Andr� Malo, Jeff Trawick, Justin Erenkrantz


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- add comment about what subst_prefix_path function does
- reduce the use of fixed buffers
- get a rid of unnecessary memory operations

Justin adds:
Fixes // problem and rewrites subst_prefix_path to make it intelligble.

Backport of modules/mappers/mod_rewrite.c r1.162 from httpd-2.1
Submitted by:	Andr� Malo
Reviewed by:	Andr� Malo, Jeff Trawick, Justin Erenkrantz


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Backport of modules/mappers/config9.m4 r1.18 from httpd-2.1
Submitted by:	kess
Reviewed by:	kess, trawick, nd, erikabele, jerenkrantz


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parsed_uri.port is only valid iff parsed_uri.port_str != NULL.
Old code simply checked if it was non-zero, not if it
was *valid*

Backport of server/core.c r1.248 from httpd-2.1
Submitted by:	Jim Jagielski
Reviewed by:	Brad Nicholes, Jim Jagielski, Justin Erenkrantz


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* prefork.c (ap_mpm_run): Only make as many dummy connections as slots
used, not as many as slots are available.

Backport of server/mpm/prefork/prefork.c r1.280 from httpd-2.1
Reviewed by:	Joe Orton, Jeff Trawick, Justin Erenkrantz


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if any property values were set which defined namespaces these
came out mangled in the PROPFIND response.

Backport of modules/dav/fs/dbm.c r1.29 from httpd-2.1
PR:		11637
Submitted by:	Amit Athavale <amit_athavale@persistent.co.in>
Reviewed by:	Joe Orton, Jeff Trawick, Justin Erenkrantz


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destination resource, propagate the WWW-Auth header from the
subrequest back to the client.

Backport of modules/dav/main/mod_dav.c r1.101 from httpd-2.1
PR: 15571
Reviewed by:	jorton, trawick, jerenkrantz


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PR:         25714
Submitted by: P.M. <millenix zemos.net>
Reviewed by:  Jeff Trawick


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several PRs


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