mod_dav: Fix a potential cause of unbounded memory usage or incorrect
behavior in a routine that sends <DAV:response>'s to the output filters.

The dav_send_one_response() function accepts the current head of the output
filter list as an argument, but the actual head can change between calls to
ap_pass_brigade().  This can happen with self-removing filters, e.g., with
the filter from mod_headers or mod_deflate.  Consequently, executing an
already removed filter can either cause unwanted memory usage or incorrect
behavior.

This patch changes the signature of the existing mod_dav's public API,
dav_send_one_response(), because this API is not yet a part of any 2.4.x
release.

* modules/dav/main/mod_dav.c
  (dav_send_one_response): Accept a request_rec instead of an ap_filter_t.
   Write the response to r->output_filters.
  (dav_send_multistatus, dav_stream_response): Update these calling sites
   of dav_send_one_response().

* modules/dav/main/mod_dav.h
  (dav_send_one_response): Adjust definition.

Submitted by: kotkov
Reviewed/backported by: jim


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mod_proxy_{http,ajp,fcgi}: don't reuse backend connections with data
     available before the request is sent.  PR 57832.



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mod_http2: fixed potential crash in beam memory handling introduced in 1.7.x changes


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Fix -Wunused-but-set-variable warnings.


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Fine tune description

Reviewed/backported by: jim


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Fine tune description

Reviewed/backported by: jim


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Some caching info

Reviewed/backported by: jim


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mod_http2: netware build add new symbol used from nghttp2


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docs: add "threat model" warning to ProxyHTMLMeta


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mod_http2/mod_proxy_http2: 100-continue implementation, PING checks on aged backend connections


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old patch I forgot to backport and don't remember
found by a new user on 2.4



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mod_proxy_http2: resolving last 2 reported dup symbol clashes



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mod_proxy_http2: renaming duplicate symbol clash between h2_proxy_util and h2_util externals



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correct type

Reviewed/backported by: jim


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mod_proxy: log diagnostics during ProxyPass[Match]

To help out users when debugging ProxyPass and ProxyPassMatch, log all
match attempts (at trace2), as well as matches that are either
successful or explicitly disabled (at trace1).
Submitted by: jchampion
Reviewed/backported by: jim


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mod_proxy_fcgi: handle the HTTP 412 use case

This is a follow up of http://svn.apache.org/r1752347;
ap_meet_conditions could return a 412 status that if not
handled causes subsequent bogus reads and wrong messages
logged (like AH01070). After a chat on dev@ the feedback
was to couple HTTP_NOT_MODIFIED with HTTP_PRECONDITION_FAILED,
but any other feedback is welcome.



Fix stupid mistake introduced in r1759984
Submitted by: elukey
Reviewed/backported by: jim


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mod_http2: reverting int->apr_uint32_t changes from 1.7.x


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