mod_proxy_fcgi: avoid loops serving proxied error documents

This commit should solve the issue indicated in PR 55415.
Httpd loops while serving a error document if:
1) The error document's content is proxied.
2) ProxyErrorOverride is set.
The solution proposed is to limit the use of ap_die only
to the initial request. I tested the change with very basic
scenarios but I am not sure if I got all the use cases,
feedback is really welcome.


Submitted by: elukey
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1757671 13f79535-47bb-0310-9956-ffa450edef68

Force mod_proxy_fcgi to read the whole FCGI response 
even when the content has not been modified (HTTP 304).

The problem is described in PR 59838. This patch should 
avoid bogus reads causing the following issues with
HTTP 304 responses:
- AH01068: Got bogus version X, expected 1
- AH01069: Got bogus rid X, expected 1
- AH01075: Error dispatching request to :
- HTTP 503 logged instead of 304 (even if the external 
  client gets correctly a 304)

As discussed on IRC the HTTP_PRECONDITION_FAILED use case
should be handled like the HTTP_NOT_MODIFIED one but it will
be done in a separate commit.


Submitted by: elukey
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1757670 13f79535-47bb-0310-9956-ffa450edef68

Fix spelling in comments and text files.
No functional change.
PR 59990

Submitted by: rjung
Reviewed/backported by: jim


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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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