merge of 1752145,1753498,1753541,1754129,1754414,1754534,1755323,1756844,1757524,1757534,1757540 from trunk

mod_http2: backport of latest changes
 - intermediate responses
 - graceful shutdown of connections
 - ht debug draft update



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PR60024 cleanups around per-dir processing/redundancy/terminology.



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Remove some trailing spaces to synch with trunk

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* Prevent redirect loops between workers within a balancer by limiting the
  number of redirects to the number balancer members.

PR: 59864

Submitted by: rpluem
Reviewed by: rpluem, jim, ylavic


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* Do not overwrite r->status with access_status if access_status is OK or DONE
  as in this case r->status might contain the true response code.

PR: 59869

Submitted by: rpluem
Reviewed by: rpluem, jim, ylavic


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mod_dav: Add dav_begin_multistatus, dav_send_one_response,
dav_finish_multistatus, dav_send_multistatus, dav_handle_err, 
dav_failed_proppatch, dav_success_proppatch to mod_dav.h.

Submitted by: minfrin
Reviewed by: minfrin, jim, ylavic


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mod_dav: Add support for childtags to dav_error.

Submitted by: minfrin
Reviewed by: minfrin, jim, ylavic


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httpoxy workarounds, first draft patch as published for all 2.2.x+ sources

Optimization to httpoxy workaround, for 2.4.23+ only.

Submitted by: Dominic Scheirlinck <dominic vendhq.com>, ylavic
Reviewed/backported by: wrowe, jim, ylavic


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Unclear whether fdpass is common enough to justify a 'most' configuration,
but for the time being, assign it -something- for a build priority.


Submitted by: wrowe
Reviewed/backported by: jim


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PR59815: rewrite per-directory + fcgi broken in 2.4.23

remove the query string from r->filename before calculating environment
(SCRIPT_FILENAME) in mod_proxy_fcgi.  Before PR59618, php-fpm would
see proxy:fcgi:// and do some of this same stripping.




Submitted by: covener
Reviewed/backported by: jim


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