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Fix ProxyAddHeaders merging.

* modules/proxy/mod_proxy.h:
  Add add_forwarded_headers_set field to proxy_dir_conf.

* modules/proxy/mod_proxy.c (create_proxy_dir_config):
  Initialize add_forwarded_headers_set.
  (add_proxy_http_headers): Set it.
  (merge_proxy_dir_config): Merge add_forwarded_headers correctly.

Reviewed by: jorton, rpluem, jim


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weekend.



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Save a few bytes in conf pool when processing 'Define'.

+ some minor style issues
+ split long lines

Be explicit and safe (const) with the strings stored in ap_server_config_defines.

Follow up to r1713043.


ap_server_config_defines and ap_server_{pre,post}_read_config are arrays of
*const* strings (must not change after being inserted), make it explicit.


Submitted by: jailletc36, ylavic, ylavic
Reviewed by: ylavic, jorton, jim


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prefork: Ignore SIGINT in child. This fixes race-condition in signals handling
when httpd is runnning on foreground and user hits ctrl+c. In this case, SIGINT
is sent to all children followed by SIGTERM from the main process, which
interrupts the SIGINT handler and leads to inconsistency (process freezes
or crashes).

Submitted by: jkaluza
Reviewed by: ylavic, jorton, jim


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core: Disallow multiple Listen on the same IP:port when listener buckets
are configured (ListenCoresBucketsRatio > 0), consistently with the single
bucket case (default), thus fixing the leak of the corresponding socket
descriptors on graceful restart.



Follow up to r1789220.
Document the implicit behaviour of ListenCoresBucketsRatio when multiple
Listen-ers are configured on the same IP:port.


Submitted by: ylavic
Reviewed by: ylavic, jim, jorton


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cross link some balancer directives across proxy mods





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There has been some discussion over IRC about
possible performance issues with the current
code in certain scenarios (like a simple echo
FCGI backend that returns data as it comes in).

Jacob is working on a different solution, waiting
for his feedback before proceeding any further.



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