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Merge r377053, r377057 and r377525 from trunk, fixing several issues with mod_proxy_http and keep-alive headers.


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  APR_FILEPATH_NOTABOVEROOT was undefined with a left-hand NULL
  or empty path.  The SECUREROOTPATH and NOTABSOLUTE tests were
  sufficient for this application.  Adjusts for a bug in earlier
  versions of APR with this undefined value.


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I am not comfortable with this solution for making the flushing band aid configurable. I do not oppose the concept, just the placement of the configuration information inside of the mod_proxy core, and not in mod_proxy_ajp.


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Merge r389697 and r390499 from trunk, making mod_disk_cache return better error codes, instead of a silly APR_EGENERAL.


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  With all of the, uhm, interesting manners in which httpd
  can be built and installed, let's ensure httpd -V gives the
  reporter a chance to identify the APR flavor used to compile
  and to run httpd when reporting bugs.


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If a connection aborts while waiting for a chunked line, flag the connection as
errored out and send errors upwards.


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  Low hanging fruit, so low you'll trip over it.


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Fix a race condition when creating the connection pool mutex and make sure that memory is being allocated from the correct pools when connections are being established. Enforce the GLOBAL_ONLY parameter for all of the directives.

Reviewed by: bnicholes, trawick, jim

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* Insert the HTTP_IN filter uncondionally before we call
  ap_send_error_response or ap_die. This ensures that
  ap_discard_request_body called by ap_die and by ap_send_error_response works
  correctly on status codes that do not cause the connection to be dropped and
  in situations where the connection should be kept alive.

PR: 38123
Reviewed by: rpluem, niq, jerenkrantz


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     [Will Rowe, Joe Orton]



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  *) mod_proxy: Fix KeepAlives not being allowed and set to
     backend servers. PR38602. [Ruediger Pluem, Jim Jagielski]

Also, document previous patch:
  *) Correctly initialize mod_proxy workers, which use a
     combination of local and shared datasets. Adjust logging
     to better trace usage. PR38403. [Jim Jagielski]


Reviewed by: jim


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* build/instdso.sh: Fix syntax error with some sed implementations.

PR: 38108
Submitted by: Masaoki Kobayashi <masaoki techfirm.co.jp>
Reviewed by: jorton, rpluem, pquerna


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* modules/ssl/ssl_scache_shmcb.c (shmcb_safe_clear): Mark with
"noinline" attribute for GCC > 3.

PR: 38838
Reviewed by: jorton, rpluem, pquerna


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runtime configurable.


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* Fix PR38340 by actual getting the word and thus advancing the message buffer
  pointer to the next data.

Submitted by: Aleksey Pesternikov <apesternikov yahoo.com>
Reviewed by: Ruediger Pluem

Submitted by: rpluem
Reviewed by: jim


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* Do not overwrite the status of initialized workers and respect the configured
  status of uninitilized workers when creating a new child process.

Submitted by: rpluem
Reviewed by: jim


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