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backport r1203708 from trunk.


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Hello. Let's compile again.
Reviewed/backported by: jim


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generic comments mostly taken over from 2.2.x.


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Remove MPM-private stuff from conn_state_t.

This should make it easier to improve the event MPM in 2.4 without breaking
the API.



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Limit recursion in ap_expr evaluation to avoid unbounded stack usage
* evaluate chains of ||, &&, and string concatenation non-recursively
* limit other types of recursion to 20 levels
* avoid some string copies if concatenating more than 2 strings


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Downgrade some more error messages about broken client behavior to level
info.


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mod_cache_disk: Make sure we check return codes on all writes and attempts
to close, and clean up after ourselves in these cases. PR43589.


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Fix logic when to call error_log hook


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value never used: dead assignment
Reviewed/backported by: jim


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check return status
Reviewed/backported by: jim


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Never used.
Reviewed/backported by: jim


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PR51471: IndexIgnore doesn't work in DirectoryMatch.




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upgrading/compat notes on some unexpected AddDescription behavior


also: mention in CHANGES



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PR39923: Allow AddDescription to work with absolute filesystem paths,
by not adding "*/" to their prefix (intended for relative paths)




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mod_include: The SSIAccessEnable directive existed to ensure the addition
of the "-A" syntax would not break existing configurations in v2.2. Remove
the directive for v2.4, defaulting the behaviour to enabled.


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mod_cache_disk: Remove the unnecessary intermediate brigade while
writing to disk. Fixes a problem where mod_disk_cache was leaving 
buckets in the intermediate brigade and not passing them to out on 
exit.


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More ap_log_rerror() usage and axe some more AJP: prefixes


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Log fatal errors at level CRIT, not at some random level from DEBUG to EMERG


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great proxy logging cleanup:
    
  * remove "proxy:", "FCGI", etc. prefixes and pid which are now
    included in the error log format

  * propagate frontend request's logconfig to backend request
    
  * use ap_log_rerror where possible
    
  * remove obsolete APLOG_NOERRNO


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Change the SSLCipherSuite default to a shorter, whitelist
oriented definition, and add an example for a speed-optimized
configuration (commented out by default).

In the SSL How-To, streamline the SSLCipherSuite examples where
applicable (explicitly banning EXP and NULL is not needed when
only HIGH is specified).


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 s/WATCHODG/WATCHDOG/


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remove lingering reslist cruft


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drop SSLv2 support (set SSL_OP_NO_SSLv2 for any new SSL_CTX)


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Avoid one apr_time_now() call in the fast path


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add new ldap features, make ap_expr entry more verbose


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