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Changes with Apache 2.3.12

  *) configure, core: Provide easier support for APR's hook probe
     capability. [Jim Jagielski, Jeff Trawick]

  *) Silence autoconf 2.68 warnings.  [Rainer Jung]

  *) mod_authnz_ldap: Resolve crash when LDAP is used for authorization only
     [Scott Hill <shill genscape.com>]

  *) support: Make sure check_forensic works with mod_unique_id loaded
     [Joe Schaefer]

  *) Add child_status hook for tracking creation/termination of MPM child
     processes.  Add end_generation hook for notification when the last
     MPM child of a generation exits. [Jeff Trawick]

  *) mod_ldap: Make LDAPSharedCacheSize 0 create a non-shared-memory cache per
     process as opposed to disabling caching completely. This allows to use
     the non-shared-memory cache as a workaround for the shared memory cache
     not being available during graceful restarts. PR 48958. [Stefan Fritsch]

  *) Add new ap_reserve_module_slots/ap_reserve_module_slots_directive API,
     necessary if a module (like mod_perl) registers additional modules late
     in the startup phase. [Stefan Fritsch]

  *) core: Prevent segfault if DYNAMIC_MODULE_LIMIT is reached. PR 51072.
     [Torsten Förtsch <torsten foertsch gmx net>]

  *) WinNT MPM: Improve robustness under heavy load.  [Jeff Trawick]

  *) MinGW build improvements.  PR 49535.  [John Vandenberg 
     <jayvdb gmail.com>, Jeff Trawick]

  *) core: Support module names with colons in loglevel configuration.
     [Torsten Förtsch <torsten foertsch gmx net>]

  *) mod_ssl, ab: Support OpenSSL compiled without SSLv2 support.
     [Stefan Fritsch]

  *) core: Abort if the MPM is changed across restart.  [Jeff Trawick]

  *) mod_proxy_ajp: Add support for 'ProxyErrorOverride on'. PR 50945.
     [Peter Pramberger <peter pramberger.at>, Jim Jagielski]

  *) mod_proxy_fcgi: Add support for 'ProxyErrorOverride on'. PR 50913.
     [Mark Montague <mark catseye.org>, Jim Jagielski]

  *) core: Change the APIs of ap_cfg_getline() and ap_cfg_getc() to return an
     error code. Abort with a nice error message if a config line is too long.
     Partial fix for PR 50824. [Stefan Fritsch]

  *) mod_info: Dump config to stdout during startup if -DDUMP_CONFIG is
     specified. PR 31956. [Stefan Fritsch]
  *) Restore visibility of DEFAULT_PIDLOG to core and modules.  MPM 
     helper function ap_remove_pid() added.  [Jeff Trawick]
  *) Enable DEFAULT_REL_RUNTIMEDIR on Windows and NetWare.  [various]

  *) Correct C++ incompatibility with http_log.h.  [Stefan Fritsch, Jeff
     Trawick]

  *) mod_log_config: Prevent segfault. PR 50861. [Torsten Förtsch
     <torsten.foertsch gmx.net>]

  *) core: AllowEncodedSlashes new option NoDecode to allow encoded slashes
     in request URL path info but not decode them. Change behavior of option
     "On" to decode the encoded slashes as 2.0 and 2.2 do.  PR 35256,
     PR 46830.  [Dan Poirier]

  *) mod_ssl: Check SNI hostname against Host header case-insensitively.
     PR 49491.  [Mayank Agrawal <magrawal.08 gmail.com>]

  *) mod_ldap: Add LDAPConnectionPoolTTL to give control over lifetime
     of bound backend LDAP connections.  PR47634 [Eric Covener]
   
  *) mod_cache: Make CacheEnable and CacheDisable configurable per
     directory in addition to per server, making them work from within
     a LocationMatch. [Graham Leggett]

  *) worker, event, prefork: Correct several issues when built as
     DSOs; most notably, the scoreboard was reinitialized during graceful
     restart, such that processes of the previous generation were not
     observable.  [Jeff Trawick]
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Changes with Apache 2.3.11

  *) mod_win32: Added shebang check for '! so that .vbs scripts work as CGI.
     Win32's cscript interpreter can only use a single quote as comment char.
     [Guenter Knauf]

  *) mod_proxy: balancer-manager now uses POST instead of GET.
     [Jim Jagielski]

  *) core: new util function: ap_parse_form_data(). Previously,
     this capability was tucked away in mod_request. [Jim Jagielski]

  *) core: new hook: ap_run_pre_read_request. [Jim Jagielski]

  *) mod_cache: When a request other than GET or HEAD arrives, we must
     invalidate existing cache entities as per RFC2616 13.10. PR 15868.
     [Graham Leggett]

  *) modules: Fix many modules that were not correctly initializing if they
     were not active during server startup but got enabled later during a
     graceful restart. [Stefan Fritsch]

  *) core: Create new ap_state_query function that allows modules to determine
     if the current configuration run is the initial one at server startup,
     and if the server is started for testing/config dumping only.
     [Stefan Fritsch]

  *) mod_proxy: Runtime configuration of many parameters for existing
     balancers via the balancer-manager. [Jim Jagielski]

  *) mod_proxy: Runtime addition of new workers (BalancerMember) for existing
     balancers via the balancer-manager. [Jim Jagielski]

  *) mod_cache: When a bad Expires date is present, we need to behave as if
     the Expires is in the past, not as if the Expires is missing. PR 16521.
     [Co-Advisor <coad@measurement-factory.com>]

  *) mod_cache: We must ignore quoted-string values that appear in a
     Cache-Control header. PR 50199. [Graham Leggett]

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  *) mod_dav: Revert change to send 501 error if unknown Content-* header is
    received for a PUT request. PR 42978. [Stefan Fritsch]

  *) mod_cache: Respect s-maxage as described by RFC2616 14.9.3, which must
     take precedence if present. PR 35247. [Graham Leggett]
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  *) mod_ssl: Fix a possible startup failure if multiple SSL vhosts
     are configured with the same ServerName and private key file.
     [Masahiro Matsuya <mmatsuya redhat.com>, Joe Orton]

  *) mod_socache_dc: Make module compile by fixing some typos.
     PR 50735 [Mark Montague <mark catseye.org>]

  *) prefork: Update MPM state in children during a graceful stop or
     restart.  PR 41743.  [Andrew Punch <andrew.punch 247realmedia.com>]

  *) mod_mime: Ignore leading dots when looking for mime extensions.
     PR 50434 [Stefan Fritsch]

  *) core: Add support to set variables with the 'Define' directive. The
     variables that can then be used in the config using the ${VAR} syntax
     known from envvar interpolation. [Stefan Fritsch]

  *) mod_proxy_http: make adding of X-Forwarded-* headers configurable.
     ProxyAddHeaders defaults to On. [Vincent Deffontaines]

  *) mod_slotmem_shm: Increase memory alignment for slotmem data.
     [Rainer Jung]

  *) mod_ssl: Add config options for OCSP: SSLOCSPResponderTimeout,
     SSLOCSPResponseMaxAge, SSLOCSPResponseTimeSkew.  
     [Kaspar Brand <httpd-dev.2011 velox.ch>]

  *) mod_ssl: Revamp output buffering to reduce network overhead for
     output fragmented into many buckets, such as chunked HTTP responses.
     [Joe Orton] 

  *) core: Apply <If> sections to all requests, not only to file base requests.
     Allow to use <If> inside <Directory>, <Location>, and <Files> sections.
     The merging of <If> sections now happens after the merging of <Location>
     sections, even if an <If> section is embedded inside a <Directory> or
     <Files> section.  [Stefan Fritsch]

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  *) mod_proxy: Refactor usage of shared data by dropping the scoreboard
     and using slotmem. Create foundation for dynamic growth/changes of
     members within a balancer. Remove BalancerNonce in favor of a
     per-balancer 'nonce' parameter. [Jim Jagielski]

  *) mod_status: Don't show slots which are disabled by MaxClients as open.
     PR: 47022 [Jordi Prats <jordi prats gmail com>, Stefan Fritsch]

  *) mpm_prefork: Fix ap_mpm_query results for AP_MPMQ_MAX_DAEMONS and
     AP_MPMQ_MAX_THREADS.

  *) mod_authz_core: Fix bug in merging logic if user-based and non-user-based
     authorization directives were mixed. [Stefan Fritsch]

  *) mod_authn_socache: change directive name from AuthnCacheProvider
     to AuthnCacheProvideFor.  The term "provider" is overloaded in
     this module, and we should avoid confusion between the provider
     of a backend (AuthnCacheSOCache) and the authn provider(s) for
     which this module provides cacheing (AuthnCacheProvideFor).
     [Nick Kew]

  *) mod_proxy_http: Allocate the fake backend request from a child pool
     of the backend connection, instead of misusing the pool of the frontend
     request. Fixes a thread safety issue where buckets set aside in the
     backend connection leak into other threads, and then disappear when
     the frontend request is cleaned up, in turn causing corrupted buckets
     to make other threads spin. [Graham Leggett]

  *) mod_ssl: Change the format of the SSL_{CLIENT,SERVER}_{I,S}_DN variables
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