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Changes with Apache 2.3.10

  *) mod_userdir: Add merging of enable, disable, and filename arguments 
     to UserDir directive, leave userlists unmerged. PR 44076 [Eric Covener]

  *) httpd: When no -k option is provided on the httpd command line, the server
     was starting without checking for an existing pidfile.  PR 50350 
     [Eric Covener] 
 
  *) mod_proxy: Put the worker in error state if the SSL handshake with the
     backend fails. PR 50332.
     [Daniel Ruggeri <DRuggeri primary.net>, Ruediger Pluem]

  *) mod_cache_disk: Fix Windows build which was broken after renaming
     the module. [Gregg L. Smith]
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Changes with Apache 2.3.9

  *) SECURITY: CVE-2010-1623 (cve.mitre.org)
     Fix a denial of service attack against mod_reqtimeout.
     [Stefan Fritsch]

  *) mod_include: Add the onerror attribute to the include element,
     allowing an URL to be specified to include on error. [Graham
     Leggett]

  *) mod_cache_disk: mod_disk_cache renamed to mod_cache_disk, to be
     consistent with the naming of other modules. [Graham Leggett]

  *) mod_setenvif: Add SetEnvIfExpr directive to set env var depending on
     expression. [Stefan Fritsch]

  *) mod_proxy: Fix ProxyPassInterpolateEnv directive. PR 50292.
     [Stefan Fritsch]

  *) suEXEC: Add Suexec directive to disable suEXEC without renaming the
     binary (Suexec Off), or force startup failure if suEXEC is required
     but not supported (Suexec On).  Change SuexecUserGroup to fail 
     startup instead of just printing a warning if suEXEC is disabled.
     [Jeff Trawick]

  *) core: Add Error directive for aborting startup or htaccess processing
     with a specified error message.  [Jeff Trawick]

  *) mod_rewrite: Fix the RewriteEngine directive to work within a
     location. Previously, once RewriteEngine was switched on globally,
     it was impossible to switch off. [Graham Leggett]

  *) core, mod_include, mod_ssl: Move the expression parser derived from
     mod_include back into mod_include. Replace ap_expr with a parser
     derived from mod_ssl's parser. Make mod_ssl use the new parser. Rework
     ap_expr's public interface and provide hooks for modules to add variables
     and functions. [Stefan Fritsch]

  *) core: Do the hook sorting earlier so that the hooks are properly sorted
     for the pre_config hook and during parsing the config. [Stefan Fritsch] 

  *) core: In the absence of any AllowOverride directives, the default is now
     "None" instead of "All".  PR49823 [Eric Covener]

  *) mod_proxy: Don't allow ProxyPass or ProxyPassReverse in
     <Directory> or <Files>. PR47765 [Eric Covener]

  *) prefork/worker/event MPMS: default value (when no directive is present)
     of MaxConnectionsPerChild/MaxRequestsPerChild is changed to 0 from 10000 
     to match default configuration and manual. PR47782 [Eric Covener]

  *) proxy_connect: Don't give up in the middle of a CONNECT tunnel
     when the child process is starting to exit.  PR50220. [Eric Covener]

  *) mod_autoindex: Fix inheritance of mod_autoindex directives into 
     contexts that don't have any mod_autoindex directives. PR47766.
     [Eric Covener]

  *) mod_rewrite: Add END flag for RewriteRule to prevent further rounds
     of rewrite processing when a per-directory substitution occurs.
     [Eric Covener]

  *) mod_ssl: Make sure to always log an error if loading of CA certificates
     fails. PR 40312. [Paul Tiemann <issues apache org ourdetour com>]

  *) mod_dav: Send 501 error if unknown Content-* header is received for a PUT
     request (RFC 2616 9.6). PR 42978. [Stefan Fritsch]

  *) mod_dav: Send 400 error if malformed Content-Range header is received for
     a put request (RFC 2616 14.16). PR 49825. [Stefan Fritsch]

  *) mod_proxy: Release the backend connection as soon as EOS is detected,
     so the backend isn't forced to wait for the client to eventually
     acknowledge the data. [Graham Leggett]

  *) mod_proxy: Optimise ProxyPass within a Location so that it is stored
     per-directory, and chosen during the location walk. Make ProxyPass
     work correctly from within a LocationMatch. [Graham Leggett]

  *) core: Fix segfault if per-module LogLevel is on virtual host
     scope. PR 50117. [Stefan Fritsch]

  *) mod_proxy: Move the ProxyErrorOverride directive to have per
     directory scope. [Graham Leggett]

  *) mod_allowmethods: New module to deny certain HTTP methods without
     interfering with authentication/authorization. [Paul Querna,
     Igor Galić, Stefan Fritsch]

  *) mod_ssl: Log certificate information and improve error message if client
     cert verification fails. PR 50093, PR 50094. [Lassi Tuura <lat cern ch>,
     Stefan Fritsch]
  *) htcacheclean: Teach htcacheclean to limit cache size by number of
     inodes in addition to size of files. Prevents a cache disk from
     running out of space when many small files are cached.
     [Graham Leggett]

  *) core: Rename MaxRequestsPerChild to MaxConnectionsPerChild, which
     describes more accurately what the directive does. The old name
     still works but logs a warning. [Stefan Fritsch]

  *) mod_cache: Optionally serve stale data when a revalidation returns a
     5xx response, controlled by the CacheStaleOnError directive.
     [Graham Leggett]

  *) htcacheclean: Allow the listing of valid URLs within the cache, with
     the option to list entry metadata such as sizes and times. [Graham
     Leggett]

  *) mod_cache: correctly parse quoted strings in cache headers.
     PR 50199 [Nick Kew]

  *) mod_cache: Allow control over the base URL of reverse proxied requests
     using the CacheKeyBaseURL directive, so that the cache key can be
     calculated from the endpoint URL instead of the server URL. [Graham
     Leggett]

  *) mod_cache: CacheLastModifiedFactor, CacheStoreNoStore, CacheStorePrivate,
     CacheStoreExpired, CacheIgnoreNoLastMod, CacheDefaultExpire,
     CacheMinExpire and CacheMaxExpire can be set per directory/location.
     [Graham Leggett]

  *) mod_disk_cache: CacheMaxFileSize, CacheMinFileSize, CacheReadSize and
     CacheReadTime can be set per directory/location. [Graham Leggett]

  *) core: Speed up config parsing if using a very large number of config
     files. PR 50002 [andrew cloudaccess net]

  *) mod_cache: Support the caching of HEAD requests. [Graham Leggett]

  *) htcacheclean: Allow the option to round up file sizes to a given
     block size, improving the accuracy of disk usage. [Graham Leggett]

  *) mod_ssl: Add authz providers for use with mod_authz_core and its
     RequireAny/RequireAll containers: 'ssl' (equivalent to SSLRequireSSL),
     'ssl-verify-client' (for use with 'SSLVerifyClient optional'), and
     'ssl-require' (expressions with same syntax as SSLRequire).
     [Stefan Fritsch]

  *) mod_ssl: Make the ssl expression parser thread-safe. It now requires
     bison instead of yacc. [Stefan Fritsch]

  *) mod_disk_cache: Change on-disk header file format to support the
     link of the device/inode of the data file to the matching header
     file, and to support the option of not writing a data file when
     the data file is empty. [Graham Leggett]

  *) core/mod_unique_id: Add generate_log_id hook to allow to use
     the ID generated by mod_unique_id as error log ID for requests.
  *) mod_cache: Make sure that we never allow a 304 Not Modified response
     that we asked for to leak to the client should the 304 response be
     uncacheable. PR45341 [Graham Leggett]

  *) mod_cache: Add the cache_status hook to register the final cache
     decision hit/miss/revalidate. Add optional support for an X-Cache
     and/or an X-Cache-Detail header to add the cache status to the
     response. PR48241 [Graham Leggett]

  *) mod_authz_host: Add 'local' provider that matches connections originating
     on the local host. PR 19938. [Stefan Fritsch]

  *) Event MPM: Fix crash accessing pollset on worker thread when child
     process is exiting.  [Jeff Trawick]

  *) core: For process invocation (cgi, fcgid, piped loggers and so forth)
     pass the system library path (LD_LIBRARY_PATH or platform-specific
     variables) along with the system PATH, by default.  Both should be 
     overridden together as desired using PassEnv etc; see mod_env.
     [William Rowe]

  *) mod_cache: Introduce CacheStoreExpired, to allow administrators to
     capture a stale backend response, perform If-Modified-Since requests
     against the backend, and serving from the cache all 304 responses.
     This restores pre-2.2.4 cache behavior.  [William Rowe]

  *) mod_rewrite: Introduce <=, >= string comparison operators, and integer
     comparators -lt, -le, -eq, -ge, and -gt.  To help bash users and drop
     the ambiguity of the symlink test "-ltest", introduce -h or -L as
     symlink test operators.  [William Rowe]
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