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mod_brotli, mod_deflate: Restore the separate handling of 304 Not Modified
responses allowing these modules to properly set or fix-up the response
headers such as Vary or ETag.

This change follows up on r1837056 that disabled that special handling and
thus resulted in a potential violation of RFC7232, 4.1:

   The server generating a 304 response MUST generate any of the following
   header fields that would have been sent in a 200 (OK) response to the
   same request: Cache-Control, Content-Location, Date, ETag, Expires,
   and Vary.)

References:
  https://lists.apache.org/thread.html/f5733ca6743757e8aa8b58a0cd9e27680971551c2a20f5606c66507e@%3Cdev.httpd.apache.org%3E
  https://tools.ietf.org/html/rfc7232#section-4.1
Submitted by: kotkov
Reviewed by: kotkov, ylavic, jim


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mod_http2: adding defensive code for stream EOS handling, in case the request handler
     missed to signal it the normal way (eos buckets). Addresses github issues 
     https://github.com/icing/mod_h2/issues/164, https://github.com/icing/mod_h2/issues/167
     and https://github.com/icing/mod_h2/issues/170. 


Submitted by: icing
Reviewed by: icing, ylavic, jim


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These need to be signed longs... cast as needed.


Add CHANGES entry
Submitted by: jim, jailletc36
Reviewed by: jailletc36 (by inspection), ylavic, jim


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trunk: http://svn.apache.org/r1841784
2.4.x: svn merge -c r1841784 ^/httpd/httpd/trunk .
+1: minfrin, jim, ylavic


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trunk patch: http://svn.apache.org/r1738415
             http://svn.apache.org/r1826930
2.4.x patch: https://svn.apache.org/repos/asf/httpd/httpd/patches/2.4.x/httpd-2.4-ab.patch
+1: minfrin, jim, ylavic


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* Pickup the proxy related configuration for verify mode and verify depth and
  not the configuration settings for frontend connections in case of
  connections by the proxy to the backend.

PR: 62769



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  *) mod_ssl: downgrade logging of requests without SNI when SSLStrictSNIVHostCheck is on
              (just a quality of life improvement for log-reading admins):
     trunk: http://svn.apache.org/r1841446
     trunk: http://svn.apache.org/r1841455
     2.4.x branch: svn merge -c 1841446,1841455 ^/httpd/httpd/trunk .
     +1: icing, minfrin, jim



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(unless I missed something, the function is also called 'ap_directory_walk' in 2.4.x)

This is only a comment update.

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fix (r1843242) for backport.


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Backport of r1842640 from trunk.


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Backport of r1842639 from trunk.


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apportion blame/credit widely.


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before signals handling to avoid lifetime issues on restart or shutdown.
PR 62658.
trunk patch: http://svn.apache.org/r1835845
             http://svn.apache.org/r1835846
             http://svn.apache.org/r1837354
             http://svn.apache.org/r1837356
             http://svn.apache.org/r1839571
             http://svn.apache.org/r1839583
2.4.x patch: http://home.apache.org/~ylavic/patches/2.4.x-mpms_async_objects_lifetime.patch
+1: ylavic, jim (but not for 2.4.35), minfrin


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