CHANGES

     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.
     [Stefan Fritsch]

  *) 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]

  *) mod_cache: Give the cache provider the opportunity to choose to cache
     or not cache based on the buckets present in the brigade, such as the
     presence of a FILE bucket.
     [Graham Leggett]

  *) mod_authz_core: Allow authz providers to check args while reading the
     config and allow to cache parsed args. Move 'all' and 'env' authz
     providers from mod_authz_host to mod_authz_core. Add 'method' authz
     provider depending on the HTTP method.  [Stefan Fritsch]

  *) mod_include: Move the request_rec within mod_include to be
     exposed within include_ctx_t. [Graham Leggett]

  *) mod_include: Reinstate support for UTF-8 character sets by allowing a
     variable being echoed or set to be decoded and then encoded as separate
     steps. PR47686 [Graham Leggett]

  *) mod_cache: Add a discrete commit_entity() provider function within the
     mod_cache provider interface which is called to indicate to the
     provider that caching is complete, giving the provider the opportunity
     to commit temporary files permanently to the cache in an atomic
     fashion. Replace the inconsistent use of error cleanups with a formal
     set of pool cleanups attached to a subpool, which is destroyed on error.
     [Graham Leggett]

  *) mod_cache: Change the signature of the store_body() provider function
     within the mod_cache provider interface to support an "in" brigade
     and an "out" brigade instead of just a single input brigade. This
     gives a cache provider the option to consume only part of the brigade
     passed to it, rather than the whole brigade as was required before.
     This fixes an out of memory and a request timeout condition that would
     occur when the original document was a large file. Introduce
     CacheReadSize and CacheReadTime directives to mod_disk_cache to control
     the amount of data to attempt to cache at a time. [Graham Leggett]

  *) core: Add ErrorLogFormat to allow configuring error log format, including
     additional information that is logged once per connection or request. Add
     error log IDs for connections and request to allow correlating error log
     lines and the corresponding access log entry. [Stefan Fritsch]

  *) core: Disable sendfile by default. [Stefan Fritsch]

  *) mod_cache: Check the request to determine whether we are allowed
     to return cached content at all, and respect a "Cache-Control:
     no-cache" header from a client. Previously, "no-cache" would
     behave like "max-age=0". [Graham Leggett]

  *) mod_cache: Use a proper filter context to hold filter data instead
     of misusing the per-request configuration. Fixes a segfault on trunk
     when the normal handler is used. [Graham Leggett]

  *) mod_cgid: Log a warning if the ScriptSock path is truncated because
     it is too long. PR 49388.  [Stefan Fritsch]

  *) vhosts: Do not allow _default_ in NameVirtualHost, or mixing *
     and non-* ports on NameVirtualHost, or multiple NameVirtualHost
     directives for the same address:port, or NameVirtualHost
     directives with no matching VirtualHosts, or multiple ip-based
     VirtualHost sections for the same address:port.  These were
     previously accepted with a warning, but the behavior was
     undefined.  [Dan Poirier]

  *) mod_remoteip: Fix a segfault when using mod_remoteip in conjunction with
     Allow/Deny. PR 49838.  [Andrew Skalski <voltara gmail.com>]

  *) core: DirectoryMatch can now match on the end of line character ($),
     and sub-directories of matched directories are no longer implicitly
     matched.  PR49809 [Eric Covener]

  *) Regexps: introduce new higher-level regexp utility including parsing
     and executing perl-style regexp ops (e.g s/foo/bar/i) and regexp memory
     [Nick Kew]

  *) Proxy: support setting source address.  PR 29404
     [Multiple contributors iterating through bugzilla,
      Aron Ujvari <xanco nikhok.hu>, Aleksey Midenkov <asm uezku.kemsu.ru>,
      <dan listening-station.net; trunk version Nick Kew]

  *) HTTP protocol: return 400 not 503 if we have to abort due to malformed
     chunked encoding. [Nick Kew]

Changes with Apache 2.3.8

  *) suexec: Support large log files. PR 45856. [Stefan Fritsch]

  *) core: Abort with sensible error message if no or more than one MPM is
     loaded. [Stefan Fritsch]

  *) mod_proxy: Rename erroronstatus to failonstatus.
     [Daniel Ruggeri <DRuggeri primary.net>]

  *) mod_dav_fs: Fix broken "creationdate" property.
     Regression in version 2.3.7. [Rainer Jung]

Changes with Apache 2.3.7

  *) SECURITY: CVE-2010-1452 (cve.mitre.org)
     mod_dav, mod_cache, mod_session: Fix Handling of requests without a path
     segment. PR: 49246 [Mark Drayton, Jeff Trawick]

  *) mod_ldap: Properly check the result returned by apr_ldap_init. PR 46076.
     [Stefan Fritsch]

  *) mod_rewrite: Log errors if rewrite map files cannot be opened. PR 49639.
     [Stefan Fritsch]

  *) mod_proxy_http: Support the 'ping' property for backend HTTP/1.1 servers
     via leveraging 100-Continue as the initial "request".
     [Jim Jagielski]

  *) core/mod_authz_core: Introduce new access_checker_ex hook that enables
     mod_authz_core to bypass authentication if access should be allowed by
     IP address/env var/... [Stefan Fritsch]

  *) core: Introduce note_auth_failure hook to allow modules to add support
     for additional auth types. This makes ap_note_auth_failure() work with
     mod_auth_digest again. PR 48807. [Stefan Fritsch]

  *) socache modules: return APR_NOTFOUND when a lookup is not found [Nick Kew]

  *) mod_authn_socache: new module [Nick Kew]

  *) configure: Add reallyall option for --enable-mods-shared. [Stefan Fritsch]

  *) Fix Windows build when using VC6. [Gregg L. Smith <lists glewis com>]

  *) mod_rewrite: Allow to set environment variables without explicitly
     giving a value. [Rainer Jung]

  *) mod_rewrite: Remove superfluous EOL from rewrite logging. [Rainer Jung]

  *) mod_include: recognise "text/html; parameters" as text/html
     PR 49616 [Andrey Chernov <ache nagual.pp.ru>]

  *) CGI vars: allow PATH to be set by SetEnv, consistent with LD_LIBRARY_PATH
     PR 43906 [Nick Kew]

  *) Core: Extra robustness: don't try authz and segfault if authn
     fails to set r->user.  Log bug and return 500 instead.
     PR 42995 [Nick Kew]

  *) HTTP protocol filter: fix handling of longer chunk extensions
     PR 49474 [<tee.bee gmx.de>]

  *) Update SSL cipher suite and add example for SSLHonorCipherOrder.
     [Lars Eilebrecht, Rainer Jung]

  *) move AddOutputFilterByType from core to mod_filter.  This should
     fix nasty side-effects that happen when content_type is set
     more than once in processing a request, and make it fully
     compatible with dynamic and proxied contents. [Nick Kew]

  *) mod_log_config: Implement logging for sub second timestamps and
     request end time.  [Rainer Jung]

Changes with Apache 2.3.6

  *) SECURITY: CVE-2009-3555 (cve.mitre.org)
     mod_ssl: Comprehensive fix of the TLS renegotiation prefix injection
     attack when compiled against OpenSSL version 0.9.8m or later. Introduces
     the 'SSLInsecureRenegotiation' directive to reopen this vulnerability
     and offer unsafe legacy renegotiation with clients which do not yet
     support the new secure renegotiation protocol, RFC 5746.
     [Joe Orton, and with thanks to the OpenSSL Team]

  *) SECURITY: CVE-2009-3555 (cve.mitre.org)
     mod_ssl: A partial fix for the TLS renegotiation prefix injection attack
     by rejecting any client-initiated renegotiations. Forcibly disable
     keepalive for the connection if there is any buffered data readable. Any
     configuration which requires renegotiation for per-directory/location
     access control is still vulnerable, unless using OpenSSL >= 0.9.8l.
     [Joe Orton, Ruediger Pluem, Hartmut Keil <Hartmut.Keil adnovum.ch>]

  *) SECURITY: CVE-2010-0408 (cve.mitre.org)
     mod_proxy_ajp: Respond with HTTP_BAD_REQUEST when the body is not sent
     when request headers indicate a request body is incoming; not a case of
     HTTP_INTERNAL_SERVER_ERROR.  [Niku Toivola <niku.toivola sulake.com>]

  *) SECURITY: CVE-2010-0425 (cve.mitre.org)
     mod_isapi: Do not unload an isapi .dll module until the request
     processing is completed, avoiding orphaned callback pointers.
     [Brett Gervasoni <brettg senseofsecurity.com>, Jeff Trawick]

  *) core: Filter init functions are now run strictly once per request
     before handler invocation.  The init functions are no longer run
     for connection filters.  PR 49328.  [Joe Orton]

  *) core: Adjust the output filter chain correctly in an internal
     redirect from a subrequest, preserving filters from the main
     request as necessary.  PR 17629.  [Joe Orton]

  *) mod_cache: Explicitly allow cache implementations to cache a 206 Partial
     Response if they so choose to do so. Previously an attempt to cache a 206
     was arbitrarily allowed if the response contained an Expires or
     Cache-Control header, and arbitrarily denied if both headers were missing.
     [Graham Leggett]

  *) core: Add microsecond timestamp fractions, process id and thread id
     to the error log. [Rainer Jung]

  *) configure: The "most" module set gets build by default.  [Rainer Jung]

  *) configure: Building dynamic modules (DSO) by default.  [Rainer Jung]

  *) configure: Fix broken VPATH build when using included APR.
     [Rainer Jung]

  *) mod_session_crypto: Fix configure problem when building
     with APR 2 and for VPATH builds with included APR.
     [Rainer Jung]

  *) mod_session_crypto: API compatibility with APR 2 crypto and
     APR Util 1.x crypto. [Rainer Jung]

  *) ab: Fix memory leak with -v2 and SSL. PR 49383.
     [Pavel Kankovsky <peak argo troja mff cuni cz>]

  *) core: Add per-module and per-directory loglevel configuration.
           Add some more trace logging.
     mod_rewrite: Replace RewriteLog/RewriteLogLevel with trace log levels.
     mod_ssl: Replace LogLevelDebugDump with trace log levels.
     mod_ssl/mod_proxy*: Adjust loglevels to be less verbose at levels info
           and debug.
     mod_dumpio:  Replace DumpIOLogLevel with trace log levels.
     [Stefan Fritsch]

  *) mod_ldap: LDAP caching was suppressed (and ldap-status handler returns
     title page only) when any mod_ldap directives were used in VirtualHost
     context.  [Eric Covener]

  *) mod_disk_cache: Decline the opportunity to cache if the response is
     a 206 Partial Content. This stops a reverse proxied partial response
     from becoming cached, and then being served in subsequent responses.
     [Graham Leggett]

  *) mod_deflate: avoid the risk of forwarding data before headers are set.
     PR 49369 [Matthew Steele <mdsteele google.com>]

  *) mod_authnz_ldap: Ensure nested groups are checked when the
     top-level group doesn't have any direct non-group members
     of attributes in AuthLDAPGroupAttribute. [Eric Covener]

  *) mod_authnz_ldap: Search or Comparison during authorization phase
     can use the credentials from the authentication phase
     (AuthLDAPSearchAsUSer,AuthLDAPCompareAsUser).
     PR 48340 [Domenico Rotiroti, Eric Covener]

  *) mod_authnz_ldap: Allow the initial DN search during authentication
     to use the HTTP username/pass instead of an anonymous or hard-coded
     LDAP id (AuthLDAPInitialBindAsUser, AuthLDAPInitialBindPattern).
     [Eric Covener]

  *) mod_authnz_ldap: Publish requested LDAP data with an AUTHORIZE_ prefix
     when this module is used for authorization. See AuthLDAPAuthorizePrefix.
     PR 45584 [Eric Covener]

  *) apxs -q: Stop filtering out ':' characters from the reported values.
     PR 45343.  [Bill Cole]

  *) prefork MPM: Work around possible crashes on child exit in APR reslist
     cleanup code.  PR 43857.  [Tom Donovan]

  *) ab: fix number of requests sent by ab when keepalive is enabled.  PR 48497.
     [Bryn Dole <dole blekko.com>]

  *) Log an error for failures to read a chunk-size, and return 408 instead of
     413 when this is due to a read timeout.  This change also fixes some cases
     of two error documents being sent in the response for the same scenario.
     [Eric Covener] PR49167

  *) mod_proxy_balancer: Add new directive BalancerNonce to allow admin
     to control/set the nonce used in the balancer-manager application.
     [Jim Jagielski]

  *) mod_proxy_connect: Support port ranges in AllowConnect. PR 23673.
     [Stefan Fritsch]

  *) Proxy balancer: support setting error status according to HTTP response
     code from a backend.  PR 48939.  [Daniel Ruggeri <DRuggeri primary.net>]

  *) htcacheclean: Introduce the ability to clean specific URLs from the
     cache, if provided as an optional parameter on the command line.
     [Graham Leggett]

  *) core: Introduce the IncludeStrict directive, which explicitly fails
     server startup if no files or directories match a wildcard path.
     [Graham Leggett]

  *) htcacheclean: Report additional statistics about entries deleted.
     PR 48944. [Mark Drayton mark markdrayton.info]

  *) Introduce SSLFIPS directive to support OpenSSL FIPS_mode; permits all
     builds of mod_ssl to use 'SSLFIPS off' for portability, but the proper
     build of openssl is required for 'SSLFIPS on'.  PR 46270.
     [Dr Stephen Henson <steve openssl.org>, William Rowe]

  *) mod_proxy_http: Log the port of the remote server in various messages.
     PR 48812. [Igor Galić <i galic brainsware org>]

  *) mod_reqtimeout: Do not wrongly enforce timeouts for mod_proxy's backend
     connections and other protocol handlers (like mod_ftp). [Stefan Fritsch]

  *) mod_proxy_ajp: Really regard the operation a success, when the client
     aborted the connection. In addition adjust the log message if the client
     aborted the connection. [Ruediger Pluem]

  *) mod_ssl: Add the 'SSLInsecureRenegotiation' directive, which
     allows insecure renegotiation with clients which do not yet
     support the secure renegotiation protocol.  [Joe Orton]

  *) mod_ssl: Fix a potential I/O hang if a long list of trusted CAs
     is configured for client cert auth. PR 46952.  [Joe Orton]

  *) core: Only log a 408 if it is no keepalive timeout. PR 39785
     [Ruediger Pluem,  Mark Montague <markmont umich.edu>]

  *) support/rotatelogs: Add -L option to create a link to the current
     log file.  PR 48761 [<lyndon orthanc.ca>, Dan Poirier]

  *) mod_ldap: Update LDAPTrustedClientCert to consistently be a per-directory
     setting only, matching most of the documentation and examples.
     PR 46541 [Paul Reder, Eric Covener]

  *) mod_ldap: LDAPTrustedClientCert now accepts CA_DER/CA_BASE64 argument
     types previously allowed only in LDAPTrustedGlobalCert. [Eric Covener]

  *) mod_negotiation: Preserve query string over multiviews negotiation.
     This buglet was fixed for type maps in 2.2.6, but the same issue
     affected multiviews and was overlooked.
     PR 33112 [Joergen Thomsen <apache jth.net>]

  *) mod_ldap: Eliminate a potential crash with multiple LDAPTrustedClientCert
     when some are not password-protected. [Eric Covener]

  *) Fix startup segfault when the Mutex directive is used but no loaded
     modules use httpd mutexes.  PR 48787.  [Jeff Trawick]

  *) Proxy: get the headers right in a HEAD request with
     ProxyErrorOverride, by checking for an overridden error
     before not after going into a catch-all code path.
     PR 41646.  [Nick Kew, Stuart Children]

  *) support/rotatelogs: Support the simplest log rotation case, log
     truncation. Useful when the log is being processed in real time
     using a command like tail. [Graham Leggett]

  *) support/htcacheclean: Teach it how to write a pid file (modelled on
     httpd's writing of a pid file) so that it becomes possible to run
     more than one instance of htcacheclean on the same machine.
     [Graham Leggett]

  *) Log command line on startup, so there's a record of command line
     arguments like -f.  PR 48752.  [Dan Poirier]

  *) Introduce mod_reflector, a handler capable of reflecting POSTed
     request bodies back within the response through the output filter
     stack. Can be used to turn an output filter into a web service.
     [Graham Leggett]

  *) mod_proxy_http: Make sure that when an ErrorDocument is served
     from a reverse proxied URL, that the subrequest respects the status
     of the original request. This brings the behaviour of proxy_handler
     in line with default_handler. PR 47106. [Graham Leggett]

  *) Support wildcards in both the directory and file components of
     the path specified by the Include directive. [Graham Leggett]

  *) mod_proxy, mod_proxy_http: Support remote https proxies
     by using HTTP CONNECT.  PR 19188.
     [Philippe Dutrueux <lilas evidian.com>, Rainer Jung]

  *) apxs: Fix -A and -a options to ignore whitespace in httpd.conf
     [Philip M. Gollucci]

  *) worker: Don't report server has reached MaxClients until it has.
     Add message when server gets within MinSpareThreads of MaxClients.
     PR 46996.  [Dan Poirier]

  *) mod_session: Session expiry was being initialised, but not updated
     on each session save, resulting in timed out sessions when there
     should not have been. Fixed. [Graham Leggett]

  *) mod_log_config: Add the R option to log the handler used within the
     request. [Christian Folini <christian.folini netnea com>]

  *) mod_include: Allow fine control over the removal of Last-Modified and
     ETag headers within the INCLUDES filter, making it possible to cache
     responses if desired. Fix the default value of the SSIAccessEnable
     directive.  [Graham Leggett]

  *) Add new UnDefine directive to undefine a variable. PR 35350.
     [Stefan Fritsch]

  *) Make ap_pregsub(), used by AliasMatch and friends, use the same syntax
     for regex backreferences as mod_rewrite and mod_include: Remove the use
     of '&' as an alias for '$0' and allow to escape any character with a
     backslash. PR 48351. [Stefan Fritsch]

  *) mod_authnz_ldap: If AuthLDAPCharsetConfig is set, also convert the
     password to UTF-8. PR 45318.
     [Johannes Müller <joh_m gmx.de>, Stefan Fritsch]

  *) ab: Fix calculation of requests per second in HTML output. PR 48594.
     [Stefan Fritsch]

  *) mod_authnz_ldap: Failures to map a username to a DN, or to check a user
     password now result in an informational level log entry instead of
     warning level.  [Eric Covener]

Changes with Apache 2.3.5

  *) SECURITY: CVE-2010-0434 (cve.mitre.org)
     Ensure each subrequest has a shallow copy of headers_in so that the
     parent request headers are not corrupted.  Eliminates a problematic
     optimization in the case of no request body.  PR 48359
     [Jake Scott, William Rowe, Ruediger Pluem]

  *) Turn static function get_server_name_for_url() into public
     ap_get_server_name_for_url() and use it where appropriate. This
     fixes mod_rewrite generating invalid URLs for redirects to IPv6
     literal addresses. [Stefan Fritsch]

  *) mod_ldap: Introduce new config option LDAPTimeout to set the timeout
     for LDAP operations like bind and search. [Stefan Fritsch]

  *) mod_proxy, mod_proxy_ftp: Move ProxyFtpDirCharset from mod_proxy to
     mod_proxy_ftp. [Takashi Sato]

  *) mod_proxy, mod_proxy_connect: Move AllowCONNECT from mod_proxy to
     mod_proxy_connect. [Takashi Sato]

  *) mod_cache: Do an exact match of the keys defined by
     CacheIgnoreURLSessionIdentifiers against the querystring instead of
     a partial match.  PR 48401.
     [Dodou Wang <wangdong.08 gmail.com>, Ruediger Pluem]

  *) mod_proxy_balancer: Fix crash in balancer-manager. [Rainer Jung]

  *) Core HTTP: disable keepalive when the Client has sent
     Expect: 100-continue
     but we respond directly with a non-100 response.
     Keepalive here led to data from clients continuing being treated as
     a new request.
     PR 47087 [Nick Kew]

  *) Core: reject NULLs in request line or request headers.
     PR 43039 [Nick Kew]

  *) Core: (re)-introduce -T commandline option to suppress documentroot
     check at startup.
     PR 41887 [Jan van den Berg <janvdberg gmail.com>]

  *) mod_autoindex: support XHTML as equivalent to HTML in IndexOptions,
                    ScanHTMLTitles, ReadmeName, HeaderName
     PR 48416 [Dmitry Bakshaev <dab18 izhnet.ru>, Nick Kew]

  *) Proxy: Fix ProxyPassReverse with relative URL
     Derived (slightly erroneously) from PR 38864 [Nick Kew]

  *) mod_headers: align Header Edit with Header Set when used on Content-Type
     PR 48422 [Cyril Bonté <cyril.bonte free.fr>, Nick Kew>]

  *) mod_headers: Enable multi-match-and-replace edit option
     PR 46594 [Nick Kew]

  *) mod_filter: enable it to act on non-200 responses.
     PR 48377 [Nick Kew]

Changes with Apache 2.3.4

  *) Replace AcceptMutex, LockFile, RewriteLock, SSLMutex, SSLStaplingMutex,
     and WatchdogMutexPath with a single Mutex directive.  Add APIs to
     simplify setup and user customization of APR proc and global mutexes.
     (See util_mutex.h.)  Build-time setting DEFAULT_LOCKFILE is no longer
     respected; set DEFAULT_REL_RUNTIMEDIR instead.  [Jeff Trawick]

  *) http_core: KeepAlive no longer accepts other than On|Off.
     [Takashi Sato]

  *) mod_dav: Remove errno from dav_error interface.  Calls to dav_new_error()
     and dav_new_error_tag() must be adjusted to add an apr_status_t parameter.
     [Jeff Trawick]

  *) mod_authnz_ldap: Add AuthLDAPBindAuthoritative to allow Authentication to
     try other providers in the case of an LDAP bind failure.
     PR 46608 [Justin Erenkrantz, Joe Schaefer, Tony Stevenson]

  *) Build: fix --with-module to work as documented
     PR 43881 [Gez Saunders <gez.saunders virgin.net>]

Changes with Apache 2.3.3

  *) SECURITY: CVE-2009-3095 (cve.mitre.org)
     mod_proxy_ftp: sanity check authn credentials.
     [Stefan Fritsch <sf fritsch.de>, Joe Orton]

  *) SECURITY: CVE-2009-3094 (cve.mitre.org)
     mod_proxy_ftp: NULL pointer dereference on error paths.
     [Stefan Fritsch <sf fritsch.de>, Joe Orton]
  *) mod_ssl: enable support for ECC keys and ECDH ciphers.  Tested against
     OpenSSL 1.0.0b3.  [Vipul Gupta <vipul.gupta sun.com>, Sander Temme]

  *) mod_dav: Include uri when logging a PUT error due to connection abort.
     PR 38149. [Stefan Fritsch]

  *) mod_dav: Return 409 instead of 500 for a LOCK request if the parent
     resource does not exist or is not a collection. PR 43465. [Stefan Fritsch]

  *) mod_dav_fs: Return 409 instead of 500 for Litmus test case copy_nodestcoll
     (a COPY request where the parent of the destination resource does not
     exist). PR 39299. [Stefan Fritsch]

  *) mod_dav_fs: Don't delete the whole file if a PUT with content-range failed.
     PR 42896. [Stefan Fritsch]

  *) mod_dav_fs: Make PUT create files atomically and no longer destroy the
     old file if the transfer aborted. PR 39815. [Paul Querna, Stefan Fritsch]

  *) mod_dav_fs: Remove inode keyed locking as this conflicts with atomically
     creating files. On systems with inode numbers, this is a format change of
     the DavLockDB. The old DavLockDB must be deleted on upgrade.
     [Stefan Fritsch]

  *) mod_log_config: Make ${cookie}C correctly match whole cookie names
     instead of substrings. PR 28037. [Dan Franklin <dan dan-franklin.com>,
     Stefan Fritsch]

  *) vhost: A purely-numeric Host: header should not be treated as a port.
     PR 44979 [Nick Kew]

  *) mod_ldap: Avoid 500 errors with "Unable to set LDAP_OPT_REFHOPLIMIT option to 5"
     when built against openldap by using SDK LDAP_OPT_REFHOPLIMIT defaults unless
     LDAPReferralHopLimit is explicitly configured.
     [Eric Covener]

  *) mod_charset_lite: Honor 'CharsetOptions NoImplicitAdd'.
     [Eric Covener]

  *) mod_ssl: Add support for OCSP Stapling.  PR 43822.
     [Dr Stephen Henson <shenson oss-institute.org>]

  *) mod_socache_shmcb: Allow parens in file name if cache size is given.
     Fixes SSLSessionCache directive mis-parsing parens in pathname.
     PR 47945. [Stefan Fritsch]

  *) htpasswd: Improve out of disk space handling. PR 30877. [Stefan Fritsch]

  *) htpasswd: Use MD5 hash by default on all platforms. [Stefan Fritsch]

  *) mod_sed: Reduce memory consumption when processing very long lines.
     PR 48024 [Basant Kumar Kukreja <basant.kukreja sun.com>]

  *) ab: Fix segfault in case the argument for -n is a very large number.
     PR 47178. [Philipp Hagemeister <oss phihag.de>]

  *) Allow ProxyPreserveHost to work in <Proxy> sections. PR 34901.
     [Stefan Fritsch]

  *) configure: Fix THREADED_MPMS so that mod_cgid is enabled again
     for worker MPM. [Takashi Sato]

  *) mod_dav: Provide a mechanism to obtain the request_rec and pathname
     from the dav_resource. [Jari Urpalainen <jari.urpalainen nokia.com>,
     Brian France <brian brianfrance.com>]

  *) Build: Use install instead of cp if available on installing
     modules to avoid segmentation fault. PR 47951. [hirose31 gmail.com]

  *) mod_cache: correctly consider s-maxage in cacheability
     decisions.  [Dan Poirier]

  *) mod_logio/core: Report more accurate byte counts in mod_status if
     mod_logio is loaded. PR 25656. [Stefan Fritsch]

  *) mod_ldap: If LDAPSharedCacheSize is too small, try harder to purge
     some cache entries and log a warning. Also increase the default
     LDAPSharedCacheSize to 500000. This is a more realistic size suitable
     for the default values of 1024 for LdapCacheEntries/LdapOpCacheEntries.
     PR 46749. [Stefan Fritsch]

  *) mod_rewrite: Make sure that a hostname:port isn't fully qualified if
     the request is a CONNECT request. [Bill Zajac <billz consultla.com>]

  *) mod_cache: Teach CacheEnable and CacheDisable to work from within a
     Location section, in line with how ProxyPass works. [Graham Leggett]

  *) mod_reqtimeout: New module to set timeouts and minimum data rates for
     receiving requests from the client. [Stefan Fritsch]

  *) core: Fix potential memory leaks by making sure to not destroy
     bucket brigades that have been created by earlier filters.
     [Stefan Fritsch]

  *) core, mod_deflate, mod_sed: Reduce memory usage by reusing bucket
     brigades in several places. [Stefan Fritsch]

  *) mod_cache: Fix uri_meets_conditions() so that CacheEnable will
     match by scheme, or by a wildcarded hostname. PR 40169
     [Peter Grandi <pg_asf asf.for.sabi.co.uk>, Graham Leggett]

  *) suxec: Allow to log an error if exec fails by setting FD_CLOEXEC
     on the log file instead of closing it. PR 10744. [Nicolas Rachinsky]

  *) mod_mime: Make RemoveType override the info from TypesConfig.
     PR 38330. [Stefan Fritsch]

  *) mod_cache: Introduce the option to run the cache from within the
     normal request handler, and to allow fine grained control over
     where in the filter chain content is cached. Adds CacheQuickHandler
     directive.  [Graham Leggett]

  *) core: Treat timeout reading request as 408 error, not 400.
     Log 408 errors in access log as was done in Apache 1.3.x.
     PR 39785 [Nobutaka Mantani <nobutaka nobutaka.org>,
     Stefan Fritsch <sf fritsch.de>, Dan Poirier]

  *) mod_ssl: Reintroduce SSL_CLIENT_S_DN, SSL_CLIENT_I_DN, SSL_SERVER_S_DN,
     SSL_SERVER_I_DN back to the environment variables to be set by mod_ssl.
     [Peter Sylvester <peter.sylvester edelweb.fr>]

  *) mod_disk_cache: don't cache incomplete responses, per RFC 2616, 13.8.
     PR15866.  [Dan Poirier]

  *) ab: ab segfaults in verbose mode on https sites
     PR46393.  [Ryan Niebur]

  *) mod_dav: Allow other modules to become providers and add resource types
     to the DAV response. [Jari Urpalainen <jari.urpalainen nokia.com>,
     Brian France <brian brianfrance.com>]

  *) mod_dav: Allow other modules to add things to the DAV or Allow headers
     of an OPTIONS request. [Jari Urpalainen <jari.urpalainen nokia.com>,
     Brian France <brian brianfrance.com>]

  *) core: Lower memory usage of core output filter.
     [Stefan Fritsch <sf sfritsch.de>]

  *) mod_mime: Detect invalid use of MultiviewsMatch inside Location and
     LocationMatch sections.  PR47754. [Dan Poirier]

  *) mod_request: Make sure the KeptBodySize directive rejects values
     that aren't valid numbers. [Graham Leggett]

  *) mod_session_crypto: Sanity check should the potentially encrypted
     session cookie be too short. [Graham Leggett]

  *) mod_session.c: Prevent a segfault when session is added but not
     configured. [Graham Leggett]

  *) htcacheclean: 19 ways to fail, 1 error message. Fixed. [Graham Leggett]

  *) mod_auth_digest: Fail server start when nonce count checking
     is configured without shared memory, or md5-sess algorithm is
     configured. [Dan Poirier]

  *) mod_proxy_connect: The connect method doesn't work if the client is
     connecting to the apache proxy through an ssl socket. Fixed.
     PR29744. [Brad Boyer, Mark Cave-Ayland, Julian Gilbey, Fabrice Durand,
     David Gence, Tim Dodge, Per Gunnar Hans, Emmanuel Elango,
     Kevin Croft, Rudolf Cardinal]

  *) mod_ssl: The error message when SSLCertificateFile is missing should
     at least give the name or position of the problematic virtual host
     definition. [Stefan Fritsch sf sfritsch.de]

  *) mod_auth_digest: Fix null pointer when qop=none. [Dan Poirier]

  *) Add support for HTTP PUT to ab. [Jeff Barnes <jbarnesweb yahoo.com>]

  *) mod_headers: generalise the envclause to support expression
     evaluation with ap_expr parser [Nick Kew]

  *) mod_cache: Introduce the thundering herd lock, a mechanism to keep
     the flood of requests at bay that strike a backend webserver as
     a cached entity goes stale. [Graham Leggett]

  *) mod_auth_digest: Fix usage of shared memory and re-enable it.
     PR 16057 [Dan Poirier]

  *) Preserve Port information over internal redirects
     PR 35999 [Jonas Ringh <jonas.ringh cixit.se>]

  *) Proxy: unable to connect to a backend is SERVICE_UNAVAILABLE,
     rather than BAD_GATEWAY or (especially) NOT_FOUND.
     PR 46971 [evanc nortel.com]

  *) Various modules: Do better checking of pollset operations in order to
     avoid segmentation faults if they fail. PR 46467
     [Stefan Fritsch <sf sfritsch.de>]

  *) mod_autoindex: Correctly create an empty cell if the description
     for a file is missing. PR 47682 [Peter Poeml <poeml suse.de>]

  *) ab: Fix broken error messages after resolver or connect() failures.
     [Jeff Trawick]

  *) SECURITY: CVE-2009-1890 (cve.mitre.org)
     Fix a potential Denial-of-Service attack against mod_proxy in a
     reverse proxy configuration, where a remote attacker can force a
     proxy process to consume CPU time indefinitely.  [Nick Kew, Joe Orton]

  *) SECURITY: CVE-2009-1191 (cve.mitre.org)
     mod_proxy_ajp: Avoid delivering content from a previous request which
     failed to send a request body. PR 46949 [Ruediger Pluem]

  *) htdbm: Fix possible buffer overflow if dbm database has very
     long values.  PR 30586 [Dan Poirier]

  *) core: Return APR_EOF if request body is shorter than the length announced
     by the client. PR 33098 [ Stefan Fritsch <sf sfritsch.de>]

  *) mod_suexec: correctly set suexec_enabled when httpd is run by a
     non-root user and may have insufficient permissions.
     PR 42175 [Jim Radford <radford blackbean.org>]

  *) mod_ssl: Fix SSL_*_DN_UID variables to use the 'userID' attribute
     type.  PR 45107.  [Michael Ströder <michael stroeder.com>,
     Peter Sylvester <peter.sylvester edelweb.fr>]

  *) mod_proxy_http: fix case sensitivity checking transfer encoding
     PR 47383 [Ryuzo Yamamoto <ryuzo.yamamoto gmail.com>]

  *) mod_alias: ensure Redirect issues a valid URL.
     PR 44020 [Håkon Stordahl <hakon stordahl.org>]

  *) mod_dir: add FallbackResource directive, to enable admin to specify
     an action to happen when a URL maps to no file, without resorting
     to ErrorDocument or mod_rewrite.  PR 47184 [Nick Kew]

  *) mod_cgid: Do not leak the listening Unix socket file descriptor to the
     CGI process. PR 47335 [Kornél Pál <kornelpal gmail.com>]

  *) mod_rewrite: Remove locking for writing to the rewritelog.
     PR 46942 [Dan Poirier <poirier pobox.com>]

  *) mod_alias: check sanity in Redirect arguments.
     PR 44729 [Sönke Tesch <st kino-fahrplan.de>, Jim Jagielski]

  *) mod_proxy_http: fix Host: header for literal IPv6 addresses.
     PR 47177 [Carlos Garcia Braschi <cgbraschi gmail.com>]

  *) mod_cache: Add CacheIgnoreURLSessionIdentifiers directive to ignore
     defined session identifiers encoded in the URL when caching.
     [Ruediger Pluem]

  *) mod_rewrite: Fix the error string returned by RewriteRule.
     RewriteRule returned "RewriteCond: bad flag delimiters" when the 3rd
     argument of RewriteRule was not started with "[" or not ended with "]".
     PR 45082 [Vitaly Polonetsky <m_vitaly topixoft.com>]

  *) Windows: Fix usage message.
     [Rainer Jung]

  *) apachectl: When passing through arguments to httpd in
     non-SysV mode, use the "$@" syntax to preserve arguments.
     [Eric Covener]

  *) mod_dbd: add DBDInitSQL directive to enable SQL statements to
     be run when a connection is opened.  PR 46827
     [Marko Kevac <mkevac gmail.com>]

  *) mod_cgid: Improve handling of long AF_UNIX socket names (ScriptSock).
     PR 47037.  [Jeff Trawick]

  *) mod_proxy_ajp: Check more strictly that the backend follows the AJP
     protocol. [Mladen Turk]

  *) mod_proxy_ajp: Forward remote port information by default.
     [Rainer Jung]

  *) Allow MPMs to be loaded dynamically, as with most other modules.  Use
     --enable-mpms-shared={list|"all"} to enable.  This required changes to
     the MPM interfaces.  Removed: mpm.h, mpm_default.h (as an installed
     header), APACHE_MPM_DIR, MPM_NAME, ap_threads_per_child,
     ap_max_daemons_limit, ap_my_generation, etc.  ap_mpm_query() can't be
     called until after the register-hooks phase.  [Jeff Trawick]

  *) mod_ssl: Add SSLProxyCheckPeerExpire and SSLProxyCheckPeerCN directives
     to enable stricter checking of remote server certificates.
     [Ruediger Pluem]

  *) ab: Fix a 100% CPU loop on platforms where a failed non-blocking connect
     returns EINPROGRESS and a subsequent poll() returns only POLLERR.
     Observed on HP-UX.  [Eric Covener]

  *) Remove broken support for BeOS, TPF, and even older platforms such
     as A/UX, Next, and Tandem.  [Jeff Trawick]

  *) mod_proxy_ftp: Add ProxyFtpListOnWildcard directive to allow files with
     globbing characters to be retrieved instead of converted into a
     directory listing.  PR 46789 [Dan Poirier <poirier pobox.com>]

  *) Provide ap_retained_data_create()/ap_retained_data_get() for preservation
     of module state across unload/load.  [Jeff Trawick]

  *) mod_substitute: Fix a memory leak. PR 44948
     [Dan Poirier <poirier pobox.com>]

Changes with Apache 2.3.2

  *) mod_mime_magic: Fix detection of compressed content. [Rainer Jung]

  *) mod_negotiation: Escape pathes of filenames in 406 responses to avoid
     HTML injections and HTTP response splitting.  PR 46837.
     [Geoff Keating <geoffk apple.com>]

  *) mod_ssl: add support for type-safe STACK constructs in OpenSSL
     development HEAD.  PR 45521.  [Kaspar Brand, Sander Temme]

  *) ab: Fix maintenance of the pollset to resolve EALREADY errors
     with kqueue (BSD/OS X) and excessive CPU with event ports (Solaris).
     PR 44584.  Use APR_POLLSET_NOCOPY for better performance with some
     pollset implementations.  [Jeff Trawick]

  *) mod_disk_cache: The module now turns off sendfile support if
     'EnableSendfile off' is defined globally. [Lars Eilebrecht]

  *) mod_deflate: Adjust content metadata before bailing out on 304
     responses so that the metadata does not differ from 200 response.
     [Roy T. Fielding]

  *) mod_deflate: Fix creation of invalid Etag headers. We now make sure
     that the Etag value is properly quoted when adding the gzip marker.
     PR 39727, 45023. [Lars Eilebrecht, Roy T. Fielding]

  *) Added 20x22 icons for ODF, SVG, and XML documents.  PR 37185.
     [Peter Harlow]

  *) Disabled DefaultType directive and removed ap_default_type()
     from core.  We now exclude Content-Type from responses for which
     a media type has not been configured via mime.types, AddType,
     ForceType, or some other mechanism. PR 13986. [Roy T. Fielding]

  *) mod_rewrite: Add IPV6 variable to RewriteCond
     [Ryan Phillips <ryan-apache trolocsis.com>]

  *) core: Enhance KeepAliveTimeout to support a value in milliseconds.
     PR 46275. [Takashi Sato]

  *) rotatelogs: Allow size units B, K, M, G and combination of
     time and size based rotation. [Rainer Jung]

  *) rotatelogs: Add flag for verbose (debug) output. [Rainer Jung]

  *) mod_ssl: Fix merging of SSLRenegBufferSize directive. PR 46508
     [<tlhackque yahoo.com>]

  *) core: Translate the the status line to ASCII on EBCDIC platforms in
     ap_send_interim_response() and for locally generated "100 Continue"
     responses.  [Eric Covener]

  *) prefork: Fix child process hang during graceful restart/stop in
     configurations with multiple listening sockets.  PR 42829.  [Joe Orton,
     Jeff Trawick]

  *) mod_session_crypto: Ensure that SessionCryptoDriver can only be
     set in the global scope. [Graham Leggett]

  *) mod_ext_filter: We need to detect failure to startup the filter
     program (a mangled response is not acceptable).  Fix to detect
     failure, and offer configuration option either to abort or
     to remove the filter and continue.
     PR 41120 [Nick Kew]

  *) mod_session_crypto: Rewrite the session_crypto module against the
     apr_crypto API. [Graham Leggett]

  *) mod_auth_form: Fix a pool lifetime issue, don't remove the subrequest
     until the main request is cleaned up. [Graham Leggett]

Changes with Apache 2.3.1

  *) ap_slotmem: Add in new slot-based memory access API impl., including
     2 providers (mod_sharedmem and mod_plainmem) [Jim Jagielski,
     Jean-Frederic Clere, Brian Akins <brian.akins turner.com>]

  *) mod_include: support generating non-ASCII characters as entities in SSI
     PR 25202 [Nick Kew]

  *) core/utils: Enhance ap_escape_html API to support escaping non-ASCII chars
     PR 25202 [Nick Kew]

  *) mod_rewrite: fix "B" flag breakage by reverting r5589343
    PR 45529 [Bob Ionescu <bobsiegen googlemail.com>]

  *) CGI: return 504 (Gateway timeout) rather than 500 when a script
     times out before returning status line/headers.
     PR 42190 [Nick Kew]

  *) mod_cgid: fix segfault problem on solaris.
     PR 39332 [Masaoki Kobayashi <masaoki techfirm.co.jp>]

  *) mod_proxy_scgi: Added. [André Malo]

  *) mod_cache: Introduce 'no-cache' per-request environment variable
     to prevent the saving of an otherwise cacheable response.
     [Eric Covener]

  *) mod_rewrite: Introduce DiscardPathInfo|DPI flag to stop the troublesome
     way that per-directory rewrites append the previous notion of PATH_INFO
     to each substitution before evaluating subsequent rules.
     PR 38642 [Eric Covener]

  *) mod_cgid: Do not add an empty argument when calling the CGI script.
     PR 46380 [Ruediger Pluem]

  *) scoreboard: Remove unused sb_type from process_score.
     [Torsten Foertsch <torsten.foertsch gmx.net>, Chris Darroch]

  *) mod_ssl: Add SSLRenegBufferSize directive to allow changing the
     size of the buffer used for the request-body where necessary
     during a per-dir renegotiation.  PR 39243.  [Joe Orton]

  *) mod_proxy_fdpass: New module to pass a client connection over to a separate
     process that is reading from a unix daemon socket.

  *) mod_ssl: Improve environment variable extraction to be more
     efficient and to correctly handle DNs with duplicate tags.
     PR 45975.  [Joe Orton]

  *) Remove the obsolete serial attribute from the RPM spec file. Compile
     against the external pcre. Add missing binaries fcgistarter, and
     mod_socache* and mod_session*. [Graham Leggett]

Changes with Apache 2.3.0

  *) mod_ratelimit: New module to do bandwidth rate limiting. [Paul Querna]

  *) Remove X-Pad header which was added as a work around to a bug in
     Netscape 2.x to 4.0b2. [Takashi Sato <takashi lans-tv.com>]

  *) Add DTrace Statically Defined Tracing (SDT) probes.
    [Theo Schlossnagle <jesus omniti.com>, Paul Querna]

  *) mod_proxy_balancer: Move all load balancing implementations
     as individual, self-contained mod_proxy submodules under
     modules/proxy/balancers [Jim Jagielski]

  *) Rename APIs to include ap_ prefix:
        find_child_by_pid -> ap_find_child_by_pid
        suck_in_APR -> ap_suck_in_APR
        sys_privileges_handlers -> ap_sys_privileges_handlers
        unixd_accept -> ap_unixd_accept
        unixd_config -> ap_unixd_config
        unixd_killpg -> ap_unixd_killpg
        unixd_set_global_mutex_perms -> ap_unixd_set_global_mutex_perms
        unixd_set_proc_mutex_perms -> ap_unixd_set_proc_mutex_perms
        unixd_set_rlimit -> ap_unixd_set_rlimit
     [Paul Querna]

  *) mod_lbmethod_heartbeat: New module to load balance mod_proxy workers
     based on heartbeats. [Paul Querna]