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reusing backend connections. PR 60330.

+1: ylavic, icing, jim
ylavic: plus http://svn.apache.org/r1856036 (opt-out)
2.4.x patch: http://people.apache.org/~ylavic/patches/httpd-2.4.x-forward_100_continue-v6.patch
+1: ylavic, jim, minfrin


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   - core: 80 chars
   - http_core: Clean-uo and style. No functional change overall
   - http_core: One more style fix in ap_process_http_async_connection()
   - mod_mime: Fix a cppcheck warning
   - mod_proxy_ajp: Fix a harmless clang warning
   - suexec: avoid a potential sprintf overflow
   - mod_headers: This is harmless, but this really should be an 'echo_do *'
   - core: Fix typo
   - core: Update a comment about the 'PATCH' HTTP command
   - mod_proxy_balancer: Fix some HTML syntax issues
trunk patch:
   - http://svn.apache.org/r1780282
   - http://svn.apache.org/r1814659
   - http://svn.apache.org/r1814660
   - http://svn.apache.org/r1838285
   - http://svn.apache.org/r1842881
   - http://svn.apache.org/r1846253
   - http://svn.apache.org/r1853757
   - http://svn.apache.org/r1851702
   - http://svn.apache.org/r1853980
   - http://svn.apache.org/r1855614
2.4.x patch: svn merge -c 1780282,1814659,1814660,1838285,1842881,1846253,1853757,1851702,1853980,1855614 ^/httpd/httpd/trunk .
+1: jailletc36, jim, rjung


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trunk patch: http://svn.apache.org/r1780280
2.4.x patch: svn merge -c 1780280 ^/httpd/httpd/trunk .
              (minus CHANGES and ap_mmn.h)
+1: jailletc36, jim, rjung


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trunk patch: http://svn.apache.org/r1856910
2.4.x patch: svn merge -c 1856910 ^/httpd/httpd/trunk .
+1: icing, covener, ylavic


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mod_proxy/ssl: Proxy SSL client certificate
configuration and other proxy SSL configurations
broken inside <Proxy> context.
PR 63430
Triggered by r1855646+r1855748.
Patch from rpluem (proxy) and ylavic (ssl).


Follow up to r1859371: extend to other ap_proxy_connection_create[_ex]() users.

This function now now handles SSL reuse as well as the "proxy-request-hostname"
note (SNI), so let's also call it unconditionnaly in all proxy modules.

On the mod_ssl side, since this note has the lifetime of the connection, don't
reset/unset it during handshake (ssl_io_filter_handshake).


Submitted by: rjung, ylavic
Reviewed by: rjung, rpluem, ylavic


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mod_proxy: allow SSLProxyCheckPeer* usage for all proxy modules.

PR 61857.

Proposed by: Markus Gausling <markusgausling googlemail.com>
Reviewed by: ylavic, rjung, rpluem


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PR 63325.

Backport of r1857129 + r1857130 from trunk.
Proposed by: ylavic
Backported by: rjung
Reviewed by: ylavic, rpluem, jim


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PIPE_BUF in mod_info in the rare case that
PIPE_BUF is defined.

Backport of 1857515 from trunk.
Proposed by: rjung
Backported by: rjung
Reviewed by: rjung, jailletc36, jim


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(r1859038 in trunk )

+ some trailing spaces removed to synch with trunk

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