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Subject: svn commit: r20343 [2/3] - /dev/httpd/
Date: Thu, 06 Jul 2017 17:42:48 -0000
To: cvs@httpd.apache.org
From: jim@apache.org
Message-Id: <20170706174251.0F6B23A1EA0@svn01-us-west.apache.org>
archived-at: Thu, 06 Jul 2017 17:42:57 -0000

Added: dev/httpd/CHANGES_2.4.27
==============================================================================
--- dev/httpd/CHANGES_2.4.27 (added)
+++ dev/httpd/CHANGES_2.4.27 Thu Jul  6 17:42:48 2017
@@ -0,0 +1,5428 @@
+                                                         -*- coding: utf-8 -*-
+
+Changes with Apache 2.4.27
+
+  *) COMPATIBILITY: mod_lua: Remove the undocumented exported 'apr_table'
+     global variable when using Lua 5.2 or later. This was exported as a
+     side effect from luaL_register, which is no longer supported as of
+     Lua 5.2 which deprecates pollution of the global namespace.
+     [Rainer Jung]
+
+  *) COMPATIBILITY: mod_http2: Disable and give warning when using Prefork.
+     The server will continue to run, but HTTP/2 will no longer be negotiated.
+     [Stefan Eissing]
+
+  *) COMPATIBILITY: mod_proxy_fcgi: Revert to 2.4.20 FCGI behavior for the
+     default ProxyFCGIBackendType, fixing a regression with PHP-FPM. PR 61202.
+     [Jacob Champion, Jim Jagielski]
+
+  *) mod_lua: Improve compatibility with Lua 5.1, 5.2 and 5.3.
+     PR58188, PR60831, PR61245. [Rainer Jung]
+  
+  *) mod_http2: Simplify ready queue, less memory and better performance. Update
+     mod_http2 version to 1.10.7. [Stefan Eissing]
+  
+  *) Allow single-char field names inadvertantly disallowed in 2.4.25.
+     PR 61220. [Yann Ylavic]
+
+  *) htpasswd / htdigest: Do not apply the strict permissions of the temporary
+     passwd file to a possibly existing passwd file. PR 61240. [Ruediger Pluem]
+
+  *) core: Avoid duplicate HEAD in Allow header.
+     This is a regression in 2.4.24 (unreleased), 2.4.25 and 2.4.26.
+     PR 61207. [Christophe Jaillet]
+
+Changes with Apache 2.4.26
+
+  *) SECURITY: CVE-2017-7679 (cve.mitre.org)
+     mod_mime can read one byte past the end of a buffer when sending a
+     malicious Content-Type response header.  [Yann Ylavic]
+
+  *) SECURITY: CVE-2017-7668 (cve.mitre.org)
+     The HTTP strict parsing changes added in 2.2.32 and 2.4.24 introduced a
+     bug in token list parsing, which allows ap_find_token() to search past
+     the end of its input string. By maliciously crafting a sequence of
+     request headers, an attacker may be able to cause a segmentation fault,
+     or to force ap_find_token() to return an incorrect value.
+     [Jacob Champion]
+
+  *) SECURITY: CVE-2017-7659 (cve.mitre.org)
+     A maliciously constructed HTTP/2 request could cause mod_http2 to
+     dereference a NULL pointer and crash the server process.
+
+  *) SECURITY: CVE-2017-3169 (cve.mitre.org)
+     mod_ssl may dereference a NULL pointer when third-party modules call
+     ap_hook_process_connection() during an HTTP request to an HTTPS port.
+     [Yann Ylavic]
+
+  *) SECURITY: CVE-2017-3167 (cve.mitre.org)
+     Use of the ap_get_basic_auth_pw() by third-party modules outside of the
+     authentication phase may lead to authentication requirements being
+     bypassed.
+     [Emmanuel Dreyfus <manu netbsd.org>, Jacob Champion, Eric Covener]
+
+  *) HTTP/2 support no longer tagged as "experimental" but is instead considered
+     fully production ready.
+
+  *) mod_http2: Fix for possible CPU busy loop introduced in v1.10.3 where a stream may keep
+     the session in continuous check for state changes that never happen. 
+     [Stefan Eissing]
+
+  *) mod_proxy_wstunnel: Add "upgrade" parameter to allow upgrade to other
+     protocols.  [Jean-Frederic Clere]
+
+  *) MPMs unix: Place signals handlers and helpers out of DSOs to avoid
+     a possible crash if a signal is caught during (graceful) restart.
+     PR 60487.  [Yann Ylavic]
+
+  *) mod_rewrite: When a substitution is a fully qualified URL, and the 
+     scheme/host/port matches the current virtual host, stop interpreting the 
+     path component as a local path just because the first component of the 
+     path exists in the filesystem.  Adds RewriteOption "LegacyPrefixDocRoot" 
+     to revert to previous behavior. PR60009.
+     [Hank Ibell <hwibell gmail.com>]
+ 
+  *) core: ap_parse_form_data() URL-decoding doesn't work on EBCDIC
+     platforms. PR61124. [Hank Ibell <hwibell gmail.com>]
+
+  *) ab: enable option processing for setting a custom HTTP method also for
+     non-SSL builds.  [Rainer Jung]
+
+  *) core: EBCDIC fixes for interim responses with additional headers.
+     [Eric Covener]
+
+  *) mod_env: when processing a 'SetEnv' directive, warn if the environment
+     variable name includes a '='. It is likely a configuration error.
+     PR 60249 [Christophe Jaillet]
+
+  *) Evaluate nested If/ElseIf/Else configuration blocks.
+     [Luca Toscano, Jacob Champion]
+
+  *) mod_rewrite: Add 'BNP' (backreferences-no-plus) flag to RewriteRule to 
+     allow spaces in backreferences to be encoded as %20 instead of '+'.
+     [Eric Covener]
+
+  *) mod_rewrite: Add the possibility to limit the escaping to specific
+     characters in backreferences by listing them in the B flag.
+     [Eric Covener]
+
+  *) mod_substitute: Fix spurious AH01328 (Line too long) errors on EBCDIC
+     systems.  [Eric Covener]
+
+  *) mod_http2: fail requests without ERROR log in case we need to read interim
+     responses and see only garbage. This can happen if proxied servers send
+     data where none should be, e.g. a body for a HEAD request. [Stefan Eissing]
+     
+  *) mod_proxy_http2: adding support for Reverse Proxy Request headers.
+     [Stefan Eissing]
+     
+  *) mod_http2: fixed possible deadlock that could occur when connections were 
+     terminated early with ongoing streams. Fixed possible hanger with timeout
+     on race when connection considers itself idle. [Stefan Eissing]  
+
+  *) mod_http2: MaxKeepAliveRequests now limits the number of times a 
+     slave connection gets reused. [Stefan Eissing]
+
+  *) mod_brotli: Add a new module for dynamic Brotli (RFC 7932) compression.
+     [Evgeny Kotkov]
+
+  *) mod_proxy_http2: Fixed bug in re-attempting proxy requests after 
+     connection error. Reliability of reconnect handling improved. 
+     [Stefan Eissing]
+  
+  *) mod_http2: better performance, eliminated need for nested locks and
+     thread privates. Moving request setups from the main connection to the
+     worker threads. Increase number of spare connections kept.
+     [Stefan Eissing]
+     
+  *) mod_http2: input buffering and dynamic flow windows for increased 
+     throughput. Requires nghttp2 >= v1.5.0 features. Announced at startup
+     in mod_http2 INFO log as feature 'DWINS'. [Stefan Eissing]
+
+  *) mod_http2: h2 workers with improved scalability for better scheduling
+     performance. There are H2MaxWorkers threads created at start and the
+     number is kept constant for now. [Stefan Eissing]
+     
+  *) mod_http2: obsoleted option H2SessionExtraFiles, will be ignored and
+     just log a warning. [Stefan Eissing]
+     
+  *) mod_autoindex: Add IndexOptions UseOldDateFormat to allow the date
+     format from 2.2 in the Last Modified column. PR60846.
+     [Hank Ibell <hwibell gmail.com>]
+ 
+  *) core: Add %{REMOTE_PORT} to the expression parser. PR59938
+     [Hank Ibell <hwibell gmail.com>]
+
+  *) mod_cache: Fix a regression in 2.4.25 for the forward proxy case by
+     computing and using the same entity key according to when the cache
+     checks, loads and saves the request.
+     PR 60577.  [Yann Ylavic]
+  
+  *) mod_proxy_hcheck: Don't validate timed out responses.  [Yann Ylavic]
+
+  *) mod_proxy_hcheck: Ensure thread-safety when concurrent healthchecks are
+     in use (ProxyHCTPsize > 0).  PR 60071.  [Yann Ylavic, Jim Jagielski]
+
+  *) core: %{DOCUMENT_URI} used in nested SSI expressions should point to the
+     URI originally requsted by the user, not the nested documents URI. This
+     restores the behavior of this variable to match the "legacy" SSI parser.
+     PR60624. [Hank Ibell <hwibell gmail.com>]
+
+  *) mod_proxy_fcgi: Add ProxyFCGISetEnvIf to fixup CGI environment
+     variables just before invoking the FastCGI. [Eric Covener,
+     Jacob Champion]
+
+  *) mod_proxy_fcgi: Return to 2.4.20-and-earlier behavior of leaving
+     a "proxy:fcgi://" prefix in the SCRIPT_FILENAME environment variable by
+     default.  Add ProxyFCGIBackendType to allow the type of backend to be
+     specified so these kinds of fixups can be restored without impacting
+     FPM. PR60576 [Eric Covener, Jim Jagielski]
+
+  *) mod_ssl: work around leaks on (graceful) restart. [Yann Ylavic]
+
+  *) mod_ssl: Add support for OpenSSL 1.1.0. [Rainer Jung]
+
+  *) Don't set SO_REUSEPORT unless ListenCoresBucketsRatio is greater
+     than zero.  [Eric Covener]
+
+  *) mod_http2: moving session cleanup to pre_close hook to avoid races with
+     modules already shut down and slave connections still operating.
+     [Stefan Eissing]
+
+  *) mod_lua: Support for Lua 5.3
+
+  *) mod_proxy_http2: support for ProxyPreserverHost directive. [Stefan Eissing]
+  
+  *) mod_http2: fix for crash when running out of memory.
+     [Robert Swiecki <robert swiecki.net>, Stefan Eissing]
+     
+  *) mod_proxy_fcgi: Return HTTP 504 rather than 503 in case of proxy timeout.
+     [Luca Toscano]
+
+  *) mod_http2: not counting file buckets again stream max buffer limits. 
+     Effectively transfering static files in one step from slave to master 
+     connection. [Stefan Eissing]
+    
+  *) mod_http2: comforting ap_check_pipeline() on slave connections
+     to facilitate reuse (see https://github.com/icing/mod_h2/issues/128).
+     [Stefan Eissing, reported by Armin Abfalterer]
+     
+  *) mod_http2: http/2 streams now with state handling/transitions as defined
+     in RFC7540. Stream cleanup/connection shutdown reworked to become easier
+     to understand/maintain/debug. Added many asserts on state and cleanup 
+     transitions. [Stefan Eissing]
+     
+  *) mod_auth_digest: Use an anonymous shared memory segment by default,
+     preventing startup failure after unclean shutdown.  PR 54622.
+     [Jan Kaluza]
+
+  *) mod_filter: Fix AddOutputFilterByType with non-content-level filters.
+     PR 58856. [Micha Lenk <micha lenk.info>]
+ 
+  *) mod_watchdog: Fix semaphore leak over restarts.  [Jim Jagielski]
+
+  *) mod_http2: regression fix on PR 59348, on graceful restart, ongoing 
+     streams are finished normally before the final GOAWAY is sent. 
+     [Stefan Eissing, <slavko gmail.com>]
+
+  *) mod_proxy: Allow the per-request environment variable "no-proxy" to
+     be used as an alternative to ProxyPass /path !. This is primarily
+     to set exceptions for ProxyPass specified in <Location> context.
+     Use SetEnvIf, not SetEnv. PR 60458.  [Eric Covener]
+
+  *) mod_http2: fixes PR60599, sending proper response for conditional requests
+     answered by mod_cache. [Jeff Wheelhouse, Stefan Eissing]
+     
+  *) mod_http2: rework of stream resource cleanup to avoid a crash in a close
+     of a lingering connection. Prohibit special file bucket beaming for
+     shared buckets. Files sent in stream output now use the stream pool
+     as read buffer, reducing memory footprint of connections.
+     [Yann Ylavic, Stefan Eissing]
+     
+  *) mod_proxy_fcgi, mod_fcgid: Fix crashes in ap_fcgi_encoded_env_len() when
+     modules add empty environment variables to the request. PR 60275.
+     [<alex2grad AT gmail.com>]
+
+  *) mod_http2: fix for possible page fault when stream is resumed during 
+     session shutdown. [sidney-j-r-m (github)]
+     
+  *) mod_http2: fix for h2 session ignoring new responses while already
+     open streams continue to have data available. [Stefan Eissing]
+     
+  *) mod_http2: adding support for MergeTrailers directive. [Stefan Eissing]
+  
+  *) mod_http2: limiting DATA frame sizes by TLS record sizes in use on the 
+     connection. Flushing outgoing frames earlier. [Stefan Eissing]
+
+  *) mod_http2: cleanup beamer registry on server reload.  PR 60510.
+     [Pavel Mateja <pavel verotel.cz>, Stefan Eissing]
+     
+  *) mod_proxy_{ajp,fcgi}: Fix a possible crash when reusing an established
+     backend connection, happening with LogLevel trace2 or higher configured,
+     or at any log level with compilers not detected as C99 compliant (e.g.
+     MSVC on Windows).  [Yann Ylavic]
+
+  *) mod_ext_filter: Don't interfere with "error buckets" issued by other
+     modules. PR 60375.  [Eric Covener, Lubos Uhliarik]
+
+  *) mod_http2: fixes https://github.com/icing/mod_h2/issues/126 e.g. beam
+     bucket lifetime handling when data is sent over temporary pools.
+     [Stefan Eissing] 
+  
+Changes with Apache 2.4.25
+
+  *) Fix some build issues related to various modules.
+     [Rainer Jung]
+
+Changes with Apache 2.4.24 (not released)
+
+  *) SECURITY: CVE-2016-8740 (cve.mitre.org)
+     mod_http2: Mitigate DoS memory exhaustion via endless
+     CONTINUATION frames.
+     [Naveen Tiwari <naveen.tiwari@asu.edu> and CDF/SEFCOM at Arizona State
+     University, Stefan Eissing]
+
+  *) SECURITY: CVE-2016-2161 (cve.mitre.org)
+     mod_auth_digest: Prevent segfaults during client entry allocation when
+     the shared memory space is exhausted.
+     [Maksim Malyutin <m.malyutin dsec.ru>, Eric Covener, Jacob Champion]
+
+  *) SECURITY: CVE-2016-0736 (cve.mitre.org)
+     mod_session_crypto: Authenticate the session data/cookie with a
+     MAC (SipHash) to prevent deciphering or tampering with a padding
+     oracle attack.  [Yann Ylavic, Colm MacCarthaigh]
+
+  *) SECURITY: CVE-2016-8743 (cve.mitre.org)
+     Enforce HTTP request grammar corresponding to RFC7230 for request lines
+     and request headers, to prevent response splitting and cache pollution by
+     malicious clients or downstream proxies. [William Rowe, Stefan Fritsch]
+
+  *) Validate HTTP response header grammar defined by RFC7230, resulting
+     in a 500 error in the event that invalid response header contents are
+     detected when serving the response, to avoid response splitting and cache
+     pollution by malicious clients, upstream servers or faulty modules.
+     [Stefan Fritsch, Eric Covener, Yann Ylavic]
+
+  *) core: Mitigate [f]cgi CVE-2016-5387 "httpoxy" issues.
+     [Dominic Scheirlinck <dominic vendhq.com>, Yann Ylavic]
+
+  *) mod_rewrite: Limit runaway memory use by short circuiting some kinds of
+     looping RewriteRules when the local path significantly exceeds 
+     LimitRequestLine.  PR 60478. [Jeff Wheelhouse <apache wheelhouse.org>]
+
+  *) mod_ratelimit: Allow for initial "burst" amount at full speed before
+     throttling: PR 60145 [Andy Valencia <ajv-etradanalhos vsta.org>,
+     Jim Jagielski]
+
+  *) mod_socache_memcache: Provide memcache stats to mod_status.
+     [Jim Jagielski]
+
+  *) http_filters: Fix potential looping in new check_headers() due to new
+     pattern of ap_die() from http header filter. Explicitly clear the
+     previous headers and body.
+
+  *) core: Drop Content-Length header and message-body from HTTP 204 responses.
+     PR 51350 [Luca Toscano]
+
+  *) mod_proxy: Honor a server scoped ProxyPass exception when ProxyPass is
+     configured in <Location>, like in 2.2. PR 60458.
+     [Eric Covener]
+
+  *) mod_lua: Fix default value of LuaInherit directive. It should be 
+     'parent-first' instead of 'none', as per documentation.  PR 60419
+     [Christophe Jaillet]
+
+  *) core: New directive HttpProtocolOptions to control httpd enforcement
+     of various RFC7230 requirements. [Stefan Fritsch, William Rowe]
+
+  *) core: Permit unencoded ';' characters to appear in proxy requests and
+     Location: response headers. Corresponds to modern browser behavior.
+     [William Rowe]
+
+  *) core: ap_rgetline_core now pulls from r->proto_input_filters.
+
+  *) core: Correctly parse an IPv6 literal host specification in an absolute
+     URL in the request line. [Stefan Fritsch]
+
+  *) core: New directive RegisterHttpMethod for registering non-standard
+     HTTP methods. [Stefan Fritsch]
+
+  *) mod_socache_memcache: Pass expiration time through to memcached.
+     [Faidon Liambotis <paravoid debian.org>, Joe Orton]
+
+  *) mod_cache: Use the actual URI path and query-string for identifying the
+     cached entity (key), such that rewrites are taken into account when
+     running afterwards (CacheQuickHandler off).  PR 21935.  [Yann Ylavic]
+
+  *) mod_http2: new directive 'H2EarlyHints' to enable sending of HTTP status
+     103 interim responses. Disabled by default. [Stefan Eissing]
+     
+  *) mod_ssl: Fix quick renegotiation (OptRenegotiaton) with no intermediate
+     in the client certificate chain.  PR 55786.  [Yann Ylavic]
+
+  *) event: Allow to use the whole allocated scoreboard (up to ServerLimit
+     slots) to avoid scoreboard full errors when some processes are finishing
+     gracefully. Also, make gracefully finishing processes close all
+     keep-alive connections. PR 53555. [Stefan Fritsch]
+
+  *) mpm_event: Don't take over scoreboard slots from gracefully finishing
+     threads. [Stefan Fritsch]
+
+  *) mpm_event: Free memory earlier when shutting down processes.
+     [Stefan Fritsch]
+
+  *) mod_status: Display the process slot number in the async connection
+     overview. [Stefan Fritsch]
+
+  *) mod_dir: Responses that go through "FallbackResource" might appear to
+     hang due to unterminated chunked encoding. PR58292. [Eric Covener]
+
+  *) mod_dav: Fix a potential cause of unbounded memory usage or incorrect
+     behavior in a routine that sends <DAV:response>'s to the output filters.
+     [Evgeny Kotkov]
+
+  *) mod_http2: new directive 'H2PushResource' to enable early pushes before 
+     processing of the main request starts. Resources are announced to the 
+     client in Link headers on a 103 early hint response. 
+     All responses with status code <400 are inspected for Link header and
+     trigger pushes accordingly. 304 still does prevent pushes.
+     'H2PushResource' can mark resources as 'critical' which gives them higher
+     priority than the main resource. This leads to preferred scheduling for
+     processing and, when content is available, will send it first. 'critical'
+     is also recognized on Link headers. [Stefan Eissing]
+     
+  *) mod_proxy_http2: uris in Link headers are now mapped back to a suitable
+     local url when available. Relative uris with an absolute path are mapped
+     as well. This makes reverse proxy mapping available for resources
+     announced in this header. 
+     With 103 interim responses being forwarded to the main client connection,
+     this effectively allows early pushing of resources by a reverse proxied
+     backend server. [Stefan Eissing]
+     
+  *) mod_proxy_http2: adding support for newly proposed 103 status code.
+     [Stefan Eissing]
+     
+  *) mpm_unix: Apache fails to start if previously crashed then restarted with
+     the same PID (e.g. in container).  PR 60261.
+     [Val <valentin.bremond gmail.com>, Yann Ylavic]
+
+  *) mod_http2: unannounced and multiple interim responses (status code < 200)
+     are parsed and forwarded to client until a final response arrives.
+     [Stefan Eissing]
+  
+  *) mod_proxy_http2: improved robustness when main connection is closed early
+     by resetting all ongoing streams against the backend.
+     [Stefan Eissing]
+  
+  *) mod_http2: allocators from slave connections are released earlier,
+     resulting in less overall memory use on busy, long lived connections.
+     [Stefan Eissing]
+     
+  *) mod_remoteip: Pick up where we left off during a subrequest rather
+     than running with the modified XFF but original TCP address.
+     PR 49839/PR 60251
+
+  *) http: Respond with "408 Request Timeout" when a timeout occurs while
+     reading the request body.  [Yann Ylavic]
+
+  *) mod_http2: connection shutdown revisited: corrected edge cases on
+     shutting down ongoing streams, changed log warnings to be less noisy
+     when waiting on long running tasks. [Stefan Eissing]
+
+  *) mod_http2: changed all AP_DEBUG_ASSERT to ap_assert to have them 
+     available also in normal deployments. [Stefan Eissing]
+
+  *) mod_http2/mod_proxy_http2: 100-continue handling now properly implemented
+     up to the backend. Reused HTTP/2 proxy connections with more than a second
+     not used will block request bodies until a PING answer is received.
+     Requests headers are not delayed by this, since they are repeatable in
+     case of failure. This greatly increases robustness, especially with
+     busy server and/or low keepalive connections. [Stefan Eissing]
+     
+  *) mod_proxy_http2: fixed duplicate symbols with mod_http2.
+     [Stefan Eissing]
+  
+  *) mod_http2: rewrite of how responses and trailers are transferred between
+     master and slave connection. Reduction of internal states for tasks
+     and streams, stability. Heuristic id generation for slave connections
+     to better keep promise of connection ids unique at given point int time.
+     Fix for mod_cgid interop in high load situtations. 
+     Fix for handling of incoming trailers when no request body is sent.
+     [Stefan Eissing]
+  
+  *) mod_http2: fix suspended handling for streams. Output could become
+     blocked in rare cases. [Stefan Eissing]
+
+  *) mpm_winnt: Prevent a denial of service when the 'data' AcceptFilter is in
+     use by replacing it with the 'connect' filter. PR 59970. [Jacob Champion]
+
+  *) mod_cgid: Resolve a case where a short CGI response causes a subsequent
+     CGI to be killed prematurely, resulting in a truncated subsequent
+     response. [Eric Covener]
+
+  *) mod_proxy_hcheck: Set health check URI and expression correctly for health
+     check worker. PR 60038 [zdeno <zdeno@scnet.sk>]
+
+  *) mod_http2: if configured with nghttp2 1.14.0 and onward, invalid request
+     headers will immediately reset the stream with a PROTOCOL error. Feature
+     logged by module on startup as 'INVHD' in info message.
+     [Stefan Eissing]
+     
+  *) mod_http2: fixed handling of stream buffers during shutdown.
+     [Stefan Eissing]
+     
+  *) mod_reqtimeout: Fix body timeout disabling for CONNECT requests to avoid
+     triggering mod_proxy_connect's AH01018 once the tunnel is established.
+     [Yann Ylavic]
+
+  *) ab: Set the Server Name Indication (SNI) extension on outgoing TLS
+     connections (unless -I is specified), according to the Host header (if
+     any) or the requested URL's hostname otherwise.  [Yann Ylavic]
+
+  *) mod_proxy_fcgi: avoid loops when ProxyErrorOverride is enabled
+     and the error documents are proxied. PR 55415. [Luca Toscano]
+
+  *) mod_proxy_fcgi: read the whole FCGI response even when the content
+     has not been modified (HTTP 304) or in case of a precondition failure
+     (HTTP 412) to avoid subsequent bogus reads and confusing
+     error messages logged. [Luca Toscano]
+
+  *) mod_http2: h2 status resource follows latest draft, see
+     http://www.ietf.org/id/draft-benfield-http2-debug-state-01.txt
+     [Stefan Eissing]
+     
+  *) mod_http2: handling graceful shutdown gracefully, e.g. handling existing
+     streams to the end. [Stefan Eissing]
+  
+  *) mod_proxy_{http,ajp,fcgi}: don't reuse backend connections with data
+     available before the request is sent.  PR 57832.  [Yann Ylavic]
+
+  *) mod_proxy_balancer: Prevent redirect loops between workers within a
+     balancer by limiting the number of redirects to the number balancer
+     members. PR 59864 [Ruediger Pluem]
+
+  *) mod_proxy: Correctly consider error response codes by the backend when
+     processing failonstatus. PR 59869 [Ruediger Pluem]
+
+  *) mod_dav: Add dav_get_provider_name() function to obtain the name
+     of the provider from mod_dav.  [Graham Leggett]
+
+  *) mod_dav: Add support for childtags to dav_error.
+     [Jari Urpalainen <jari.urpalainen nokia.com>]
+
+  *) mod_proxy_fcgi: Fix 2.4.23 breakage for mod_rewrite per-dir and query 
+     string showing up in SCRIPT_FILENAME. PR59815
+
+  *) mod_include: Fix a potential memory misuse while evaluating expressions.
+     PR59844. [Eric Covener]
+
+  *) mod_http2: new H2CopyFiles directive that changes treatment of file
+     handles in responses. Necessary in order to fix broken lifetime handling
+     in modules such as mod_wsgi.
+  
+  *) mod_http2: removing timeouts on master connection while requests are
+     being processed. Requests may timeout, but the master only times out when
+     no more requests are active. [Stefan Eissing]
+     
+  *) mod_http2: fixes connection flush when answering SETTINGS without any
+     stream open. [Moto Ishizawa <@summerwind>, Stefan Eissing]
+     
+Changes with Apache 2.4.23
+
+  *) mod_ssl: reset client-verify state of ssl when aborting renegotiations.
+     [Erki Aring <erki@example.ee>, Stefan Eissing]
+
+  *) mod_sed: Fix 'x' command processing. [Christophe Jaillet]
+
+  *) configure: Fix ./configure edge-case failures around dependencies
+     of mod_proxy_hcheck. [William Rowe, Ruediger Pluem, Jeff Trawick]
+
+Changes with Apache 2.4.22
+
+  *) mod_http2: fix for request abort when connections drops, introduced in
+     1.5.8
+
+Changes with Apache 2.4.21
+
+  *) ab: Use caseless matching for HTTP tokens (e.g. content-length). PR 59111.
+     [Yann Ylavic]
+
+  *) mod_http2: more rigid error handling in DATA frame assembly, leading
+     to deterministic connection errors if assembly fails.
+     [Stefan Eissing, Pal Nilsen <https://github.com/maedox>]
+
+  *) abs: Include OPENSSL_Applink when compiling on Windows, to resolve
+     failures under Visual Studio 2015 and other mismatched MSVCRT flavors.
+     PR59630 [Jan Ehrhardt <phpdev ehrhardt.nl>]
+
+  *) mod_ssl: Add "no_crl_for_cert_ok" flag to SSLCARevocationCheck directive
+     to opt-in previous behaviour (2.2) with CRLs verification when checking
+     certificate(s) with no corresponding CRL.  [Yann Ylavic]
+
+  *) mpm_event, mpm_worker: Fix computation of MinSpareThreads' lower bound
+     according the number of listeners buckets.  [Yann Ylavic]
+
+  *) Add ap_cstr_casecmp[n]() - placeholder of apr_cstr_casecmp[n] functions
+     for case-insensitive C/POSIX-locale token comparison.
+     [Jim Jagielski, William Rowe, Yann Ylavic, Branko Äibej]
+
+  *) mod_userdir: Constify and save a few bytes in the conf pool when
+     parsing the "UserDir" directive. [Christophe Jaillet]
+
+  *) mod_cache: Fix (max-stale with no '=') and enforce (check
+     integers after '=') Cache-Control header parsing.
+     [Christophe Jaillet]
+
+  *) core: Add -DDUMP_INCLUDES configtest option to show the tree
+     of Included configuration files.
+     [Jacob Champion <champion.pxi gmail.com>]
+
+  *) mod_proxy_fcgi: Avoid passing a filename of proxy:fcgi:// as
+     SCRIPT_FILENAME to a FastCGI server. PR59618.
+     [Jacob Champion <champion.pxi gmail.com>]
+
+  *) mod_dav: Add dav_get_provider_name() function to obtain the name
+     of the provider from mod_dav.
+     [Jari Urpalainen <jari.urpalainen nokia.com>]
+
+  *) mod_proxy_http2: properly care for HTTP2 flow control of the frontend
+     connection is HTTP/1.1. [Patch supplied by Evgeny Kotkov]
+     
+  *) mod_http2: improved cleanup of connection/streams/tasks to always
+     have deterministic order regardless of event initiating it. Addresses
+     reported crashes due to memory read after free issues. 
+     [Stefan Eissing] 
+  
+  *) mod_ssl: Correct the interaction between SSLProxyCheckPeerCN and newer
+     SSLProxyCheckPeerName directives since release 2.4.5, such that disabling
+     either disables both, and that enabling either triggers the new, more
+     comprehensive SSLProxyCheckPeerName behavior. Only a single configuration
+     remains to enable the legacy behavior, which is to explicitly disable
+     SSLProxyCheckPeerName, and enable SSLProxyCheckPeerCN. [William Rowe]
+
+  *) mod_include: add the <!--#comment ...> syntax in order to include comments
+     in a SSI file. [Christophe Jaillet based on a suggestion from Rob]
+
+  *) mod_http2: improved event handling for suspended streams, responses
+     and window updates. [Stefan Eissing] 
+     
+  *) mod_proxy_hcheck: Provide for dynamic background health
+     checks on reverse proxies associated with BalancerMember
+     workers. [Jim Jagielski]
+
+  *) mod_http2: Fix async write issue that led to selection of wrong timeout
+     vs. keepalive timeout selection for idle sessions. [Stefan Eissing]
+     
+  *) mod_http2: checking LimitRequestLine, LimitRequestFields and 
+     LimitRequestFieldSize configurated values for incoming streams. Returning
+     HTTP status 431 for too long/many headers fields and 414 for a too long
+     pseudo header. [Stefan Eissing]
+     
+  *) mod_http2: tracking conn_rec->current_thread on slave connections, so
+     that mod_lua finds the correct one. Fixes PR 59542. [Stefan Eissing]
+     
+  *) mod_proxy_http2: new experimental http2 proxy module for h2: and h2c: proxy
+     urls. Part of the httpd mod_proxy framework, common settings apply.
+     Requests from the same HTTP/2 frontend connection against the same backend
+     are aggregated on a single connection.
+     [Stefan Eissing]
+  
+  *) mod_http2: slave connections have conn_rec->aborted flag set when a stream
+     has been reset by the client. [Stefan Eissing]
+
+  *) mod_http2: merge of some 2.4.x adaptions re filters on slave connections.
+     Small fixes in bucket beams when forwarding file buckets. Output handling
+     on master connection uses less FLUSH and passes automatically when more
+     than half of H2StreamMaxMemSize bytes have accumulated.
+     Workaround for http: when forwarding partial file buckets to keep the
+     output filter from closing these too early. [Stefan Eissing]
+
+  *) mod_http2: elimination of fixed master connection buffer for TLS 
+     connections. New scratch bucket handling optimized for TLS write sizes. 
+     File bucket data read directly into scratch buffers, avoiding one
+     copy. Non-TLS connections continue to pass buckets unchanged to the core
+     filters to allow sendfile() usage. [Stefan Eissing]
+
+  *) mod_http2/mod_proxy_http2: h2_request.c is no longer shared between these
+     modules. This simplifies building on platforms such as Windows, as module
+     reference used in logging is now clear. [Stefan Eissing]
+
+  *) Scoreboard: Fix a regression in 2.4.20 that causes wrong request data
+     to be displayed on the status page. PR 59333. [Yann Ylavic, William Rowe]
+
+  *) mod_http2: fixed a bug that caused mod_proxy_http2 to be called for window
+     updates on requests it had already reported done. Added synchronization
+     on early connection/stream close that lets ongoing requests safely drain
+     their input filters.
+     [Stefan Eissing]
+
+  *) mod_http2: scoreboard updates that summarize the h2 session (and replace
+     the last request information) will only happen when the session is idle or 
+     in shutdown/done phase. [Stefan Eissing]
+
+  *) mod_http2: new "bucket beam" technology to transport buckets across
+     threads without buffer copy. Delaying response start until flush or
+     enough body data has been accumulated. Overall significantly smaller
+     memory footprint. [Stefan Eissing]
+
+  *) core: New CGIVar directive can configure REQUEST_URI to represent the
+     current URI being processed instead of always the original request.
+     [Jeff Trawick]
+
+  *) scoreboard/status: Restore behavior of showing workers' previous Client,
+     VHost and Request values when idle, like in 2.4.18 and earlier. 
+
+  *) mod_http2: r->protocol changed to "HTTP/2.0" (was "HTTP/2") as this will
+     give expected syntax in CGI's SERVER_PROTOCOL is more compatible with
+     existing major/minor handling. Fixes PR 59313.
+
+  *) mod_http2: disabling mmap for file buckets transport due to segmenation
+     faults when files change on the fly.
+
+Changes with Apache 2.4.20
+
+  *) SECURITY: CVE-2016-1546 (cve.mitre.org)     
+     mod_http2: restricting number of concurrent stream workers per connection
+     if client is slow. 
+
+  *) core: Do not read .htaccess if AllowOverride and AllowOverrideList
+     are "None". PR 58528.
+     [Michael Schlenker <msc contact.de, Ruediger Pluem, Daniel Ruggeri]
+
+  *) mod_proxy_express: Fix possible use of DB handle after close.  PR 59230.
+     [Petr <pgajdos suse.cz>]
+
+  *) core/util_script: relax alphanumeric filter of environment variable names
+     on Windows to allow '(' and ')' for passing PROGRAMFILES(X86) et.al.
+     unadulterated in 64 bit versions of Windows. PR 46751.
+     [John <john leineweb de>]
+
+  *) mod_http2: incrementing keepalives on each request started so that logging
+     %k gives increasing numbers per master http2 connection. 
+     New documented variables in env, usable in custom log formats: H2_PUSH,
+     H2_PUSHED, H2_PUSHED_ON, H2_STREAM_ID and H2_STREAM_TAG.
+     [Stefan Eissing]
+
+  *) mod_http2: more efficient passing of response bodies with less contention
+     and file bucket forwarding. [Stefan Eissing]
+
+  *) mod_http2: fix for missing score board updates on request count, fix for
+     memory leak on slave connection reuse. [Stefan Eissing]
+
+  *) mod_http2: Fix build on Windows from dsp files.
+     [Stefan Eissing] 
+     
+Changes with Apache 2.4.19
+
+  *) mod_include: Add variable DOCUMENT_ARGS, with the arguments to the
+     request for the SSI document.  [Jeff Trawick]
+
+  *) mod_authz_host: Add a new "forward-dns" authorization type, not relying on
+     reverse DNS lookups.  [Fabien]
+
+  *) mod_proxy_http2: new experimental http2 proxy module for h2: and h2c: proxy
+     urls. Uses backend connections for concurrent requests if frontend 
+     connection is http2 as well.
+     [Stefan Eissing]
+  
+  *) mod_ssl: Add hooks to allow other modules to perform processing at
+     several stages of initialization and connection handling.  See
+     mod_ssl_openssl.h.  [Jeff Trawick]
+
+  *) mod_http2: disabling PUSH when client sends GOAWAY. Slave connections are 
+     reused for several requests, improved performance and better memory use. 
+     [Stefan Eissing]  
+
+  *) mod_rewrite: Don't implicitly URL-escape the original query string
+     when no substitution has changed it (like PR50447 but server context)
+     [Evgeny Kotkov <evgeny.kotkov visualsvn.com>]
+
+  *) mod_http2: fixes problem with wrong lifetime of file buckets on main
+     connection. [Stefan Eissing]
+
+  *) mod_http2: fixes incorrect denial of requests without :authority header.
+     [Stefan Eissing]
+
+  *) mod_reqtimeout: Prevent long response times from triggering a timeout once
+     the request has been fully read.  PR 59045.  [Yann Ylavic]
+
+  *) ap_expr: expression support for variable HTTP2=on|off. [Stefan Eissing]
+
+  *) mod_http2: give control to async mpm for keepalive timeouts only when
+     no streams are open and even if only after 1 sec delay. Under load, event
+     mpm discards connections otherwise too quickly. [Stefan Eissing]
+
+  *) mod_ssl: Don't lose track of the SSL context if an unlikely failure occurs
+     in ssl_init_ssl_connection().  [Graham Leggett]
+
+  *) mod_rewrite: Add QSL|qslast flag to allow rewrites to files with
+     literal question marks in their names. PR 58777. [Eric Covener]
+
+  *) event: use pre_connection hook to properly initialize connection state for
+     slave connections. use protocol_switch hook to initialize server config
+     early based on SNI selected vhost. 
+     [Stefan Eissing]
+
+  *) hostname: Test and log useragent_host per-request across various modules,
+     including the scoreboard, expression and rewrite engines, setenvif,
+     authz_host, access_compat, custom logging, ssl and REMOTE_HOST variables.
+     PR55348  [William Rowe]
+
+  *) core: Track the useragent_host per-request when mod_remoteip or similar
+     modules track a per-request useragent_ip.  Modules should be updated
+     to inquire for ap_get_useragent_host() in place of ap_get_remote_host().
+     [William Rowe]
+
+  *) core: fix a bug in <UnDefine ...> directive processing. When used, the last
+     <Define...>'ed variable was also withdrawn. PR 59019
+     [Christophe Jaillet]
+
+  *) mod_http2: Accept-Encoding is, when present on the initiating request, 
+     added to push promises. This lets compressed content work in pushes.
+     by the client. [Stefan Eissing]
+
+  *) mod_http2: fixed possible read after free when streams were cancelled early
+     by the client. [Stefan Eissing]
+
+  *) mod_http2: fixed possible deadlock during connection shutdown. Thanks to 
+     @FrankStolle for reporting and getting the necessary data.
+     [Stefan Eissing]
+
+  *) mod_http2: fixed apr_uint64_t formatting in a log statement to user proper 
+     APR def, thanks to @Sp1l.
+
+  *) mod_http2: number of worker threads allowed to a connection is adjusting 
+     dynamically. Starting with 4, the number is doubled when streams can be 
+     served without block on http/2 connection flow. The number is halfed, when
+     the server has to wait on client flow control grants. 
+     This can happen with a maximum frequency of 5 times per second. 
+     When a connection occupies too many workers, repeatable requests 
+     (GET/HEAD/OPTIONS) are cancelled and placed back in the queue. Should that 
+     not suffice and a stream is busy longer than the server timeout, the 
+     connection will be aborted with error code ENHANCE_YOUR_CALM.
+     This does *not* limit the number of streams a client may open, rather the
+     number of server threads a connection might use.
+     [Stefan Eissing]
+
+  *) mod_http2: allowing link header to specify multiple "rel" values, 
+     space-separated inside a quoted string. Prohibiting push when Link 
+     parameter "nopush" is present.
+     [Stefan Eissing]
+
+  *) mod_http2: reworked connection state handling. Idle connections accept a
+     GOAWAY from the client without further reply. Otherwise the
+     module makes a best effort to send one last GOAWAY to the client.
+
+  *) mod_http2: the values from standard directives Timeout and KeepAliveTimeout
+     properly are applied to http/2 connections.
+     [Stefan Eissing]
+
+  *) mod_http2: idle connections are returned to async mpms. new hook
+     "pre_close_connection" used to send GOAWAY frame when not already done.
+     Setting event mpm server config "by hand" for the main connection to
+     the correct negotiated server.
+     [Stefan Eissing]
+
+  *) mod_http2: keep-alive blocking reads are done with 1 second timeouts to
+     check for MPM stopping. Will announce early GOAWAY and finish processing
+     open streams, then close.
+     [Stefan Eissing]
+
+  *) mod_http2: bytes read/written on slave connections are reported via the
+     optional mod_logio functions. Fixes PR 58871.
+
+  *) prefork: Initialize the POD when running in ONE_PROCESS (or -X) mode to
+     avoid a crash.  [Jan Kaluza, Yann Ylavic]
+
+  *) mod_ssl: When SSLVerify is disabled (NONE), don't force a renegotiation if
+     the SSLVerifyDepth applied with the default/handshaken vhost differs from
+     the one applicable with the finally selected vhost.  [Yann Ylavic]
+
+  *) core: Ensure that httpd exits with an error status when the MPM fails
+     to run.  [Yann Ylavic]
+
+  *) mod_ssl: Fix a possible memory leak on restart for custom [EC]DH params.
+     [Jan Kaluza, Yann Ylavic]
+
+  *) mod_ssl: Add SSLOCSPProxyURL to add the possibility to do all queries
+     to OCSP responders through a HTTP proxy. [Ruediger Pluem]
+
+  *) mod_proxy: Play/restore the TLS-SNI on new backend connections which
+     had to be issued because the remote closed the previous/reusable one
+     during idle (keep-alive) time.  [Yann Ylavic]
+
+  *) mod_cache_socache: Fix a possible cached entity body corruption when it
+     is received from an origin server in multiple batches and forwarded by
+     mod_proxy.  [Yann Ylavic]
+
+  *) core: Add expression support to SetHandler.
+     [Eric Covener]
+
+  *) mod_remoteip: Prevent an external proxy from presenting an internal
+     proxy. PR 55962. [Mike Rumph]
+
+  *) core: Prevent a server crash in case of an invalid CONNECT request with
+     a custom error page for status code 400 that uses server side includes.
+     PR 58929 [Ruediger Pluem]
+
+  *) mod_ssl: handle TIMEOUT on empty SSL input as non-fatal, returning 
+     APR_TIMEUP and preserving connection state for later retry.
+     [Stefan Eissing]
+
+  *) mod_ssl: Save some TLS record (application data) fragmentations by
+     including the last and subsequent suitable buckets when coalescing.
+     [Yann Ylavic]
+
+  *) mod_proxy_fcgi: Suppress HTTP error 503 and message 01075, 
+     "Error dispatching request", when the cause appears to be 
+     due to the client closing the connection. 
+     PR58118.  [Tobias Adolph <adolph lrz.de>]
+
+  *) mod_cgid: Message AH02550, failure to flush a response to the client,
+     is now logged at TRACE1 level to match the underlying core output filter
+     severity.  [Eric Covener]
+
+  *) mime.types: add common extension "m4a" for MPEG 4 Audio.
+     PR 57895 [Dylan Millikin <dylan.millikin gmail.com>]
+
+  *) Added many log numbers to log statements that had none.
+     [Rainer Jung]
+
+  *) mod_log_config: Add GlobalLog to allow a globally defined log to
+     be inherited by virtual hosts that define a CustomLog.
+     [Edward Lu]
+
+  *) mod_http2: connections how keep a "push diary" where hashes of already
+     pushed resources are kept. See directive H2PushDiarySize for managing this.
+     Push diaries can be initialized by clients via the "Cache-Digest" request
+     header. This carries a base64url encoded. compressed Golomb set as described
+     in https://datatracker.ietf.org/doc/draft-kazuho-h2-cache-digest/
+     Introduced a status handler for HTTP/2 connections, giving various counters
+     and statistics about the current connection, plus its cache digest value
+     in a JSON record. Not a replacement for more HTTP/2 in the server status. 
+     Configured as
+     <Location "/http2-status">
+         SetHandler http2-status
+     </Location>
+     [Stefan Eissing]
+
+  *) mod_http2: Fixed flushing of last GOAWAY frame. Previously, that frame
+     did not always reach the client, causing some to fail the next request.
+     Fixed calculation of last stream id accepted as described in rfc7540. 
+     Reading in KEEPALIVE state now correctly shown in scoreboard. 
+     Fixed possible race in connection shutdown after review by Ylavic. 
+     Fixed segfault on connection shutdown, callback ran into a semi dismantled session. 
+     [Stefan Eissing]
+
+  *) mod_http2: Added support for experimental accept-push-policy draft
+     (https://tools.ietf.org/html/draft-ruellan-http-accept-push-policy-00). Clients
+     may now influence server pushes by sending accept-push-policy headers.
+     [Stefan Eissing]
+
+  *) mod_http2: new r->subprocess_env variables HTTP2 and H2PUSH, set to "on"
+     when available for request.
+     [Stefan Eissing]
+
+  *) mod_http2: fixed bug in input window size calculation by moving chunked
+     request body encoding into later stage of processing. Fixes PR 58825.
+     [Stefan Eissing]
+
+  *) core: new hook "pre_close_connection" which is run before the lingering
+     close of connections is started. This gives protocol handlers one last
+     chance to use a connection before it goes down.
+     [Stefan Eissing]
+
+  *) mod_status/scoreboard: showing connection protocol in new column, new 
+     ap_update_child_status methods for updating server/description. mod_ssl
+     sets vhost negotiated by servername directly.
+     [Stefan Eissing]
+
+Changes with Apache 2.4.18
+
+  *) mod_ssl: for all ssl_engine_vars.c lookups, fall back to master connection
+     if conn_rec itself holds no valid SSLConnRec*. Fixes PR58666.
+     [Stefan Eissing]
+
+  *) mod_http2: connection level window for flow control is set to protocol
+     maximum of 2GB-1, preventing window exhaustion when sending data on many
+     streams with higher cumulative window size. 
+     Reducing write frequency unless push promises need to be flushed.
+     [Stefan Eissing]
+
+  *) mod_http2: required minimum version of libnghttp2 is 1.2.1
+     [Stefan Eissing]
+
+  *) mod_proxy_fdpass: Fix AH01153 error when using the default configuration.
+     In earlier version of httpd, you can explicitelly set the 'flusher' parameter
+     to 'flush' as a workaround. (i.e. flusher=flush)
+     Add documentation for the 'flusher' parameter when defining a proxy worker.
+     [Christophe Jaillet]
+
+  *) mod_ssl: For the "SSLStaplingReturnResponderErrors off" case, make sure
+     to only staple responses with certificate status "good". [Kaspar Brand]
+
+  *) mod_http2: new directive 'H2PushPriority' to allow priority specifications
+     on server pushed streams according to their content-type. 
+     [Stefan Eissing]
+
+  *) mod_http2: fixes crash on connection abort for a busy connection.
+     fixes crash on a request that did not produce any response.
+     [Stefan Eissing]
+
+  *) mod_http2: trailers are sent after response body if set in request_rec
+     trailers_out before the end-of-request bucket is sent through the 
+     output filters. [Stefan Eissing]
+
+  *) mod_http2: incoming trailers (headers after request body) are properly
+     forwarded to the processing engine. [Stefan Eissing]
+
+  *) mod_http2: new directive 'H2Push' to en-/disable HTTP/2 server
+     pushes a server/virtual host. Pushes are initiated by the presence
+     of 'Link:' headers with relation 'preload' on a response. [Stefan Eissing]
+
+  *) mod_http2: write performance of http2 improved for larger resources,
+     especially static files. [Stefan Eissing]
+
+  *) core: if the first HTTP/1.1 request on a connection goes to a server that
+     prefers different protocols, these protocols are announced in a Upgrade:
+     header on the response, mentioning the preferred protocols.
+     [Stefan Eissing]
+
+  *) mod_http2: new directives 'H2TLSWarmUpSize' and 'H2TLSCoolDownSecs'
+     to control TLS record sizes during connection lifetime.
+     [Stefan Eissing]
+
+  *) mod_http2: new directive 'H2ModernTLSOnly' to enforce security
+     requirements of RFC 7540 on TLS connections. [Stefan Eissing]
+
+  *) core: add ap_get_protocol_upgrades() to retrieve the list of protocols
+     that a client could possibly upgrade to. Use in first request on a 
+     connection to announce protocol choices. [Stefan Eissing]
+
+  *) mod_http2: reworked deallocation on connection shutdown and worker
+     abort. Separate parent pool for all workers. worker threads are joined
+     on planned worker shutdown. [Yann Ylavic, Stefan Eissing]
+
+  *) mod_ssl: when receiving requests for other virtual hosts than the handshake
+     server, the SSL parameters are checked for equality. With equal 
+     configuration, requests are passed for processing. Any change will trigger
+     the old behaviour of "421 Misdirected Request".
+     SSL now remembers the cipher suite that was used for the last handshake.
+     This is compared against for any vhost/directory cipher specification. 
+     Detailed examination of renegotiation is only done when these do not
+     match.
+     Renegotiation is 403ed when a master connection is present. Exact reason
+     is given additionally in a request note. [Stefan Eissing]
+
+  *) mod_ssl: Make the output filter more friendly with deferred write and
+     response pipelining. [Yann Ylavic, Joe Orton]
+
+  *) core: Fix scoreboard crash (SIGBUS) on hardware requiring strict 64bit
+     alignment (SPARC64, PPC64).  [Yann Ylavic]
+
+  *) mod_cache: Accept HT (Horizontal Tab) when parsing cache related header
+     fields as described in RFC7230. [Christophe Jaillet]
+
+  *) core/util_script: making REDIRECT_URL a full URL is now opt-in
+     via new 'QualifyRedirectURL' directive.
+
+  *) core: Limit to ten the number of tolerated empty lines between request,
+     and consume them before the pipelining check to avoid possible response
+     delay when reading the next request without flushing.  [Yann Ylavic]
+
+  *) mod_ssl: Extend expression parser registration to support ssl variables
+     in any expression using mod_rewrite syntax "%{SSL:VARNAME}" or function
+     syntax "ssl(VARNAME)". [Rainer Jung]
+
+Changes with Apache 2.4.17
+
+  *) mod_http2: added donated HTTP/2 implementation via core module. Similar
+     configuration options to mod_ssl. [Stefan Eissing]
+
+  *) mod_proxy: don't recyle backend announced "Connection: close" connections
+     to avoid reusing it should the close be effective after some new request
+     is ready to be sent.  [Yann Ylavic]
+
+  *) mod_substitute: Allow to configure the patterns merge order with the new
+     SubstituteInheritBefore on|off directive.  PR 57641
+     [Marc.Stern <Marc.Stern approach.be>, Yann Ylavic, William Rowe]
+
+  *) mod_proxy: Fix ProxySourceAddress binding failure with AH00938.
+     PR 56687.  [Arne de Bruijn <apache arbruijn.dds.nl>
+
+  *) mod_ssl: Support compilation against libssl built with OPENSSL_NO_SSL3,
+     and change the compiled-in default for SSL[Proxy]Protocol to "all -SSLv3",
+     in accordance with RFC 7568. PR 58349, PR 57120. [Kaspar Brand]
+
+  *) mod_ssl: append :!aNULL:!eNULL:!EXP to the cipher string settings,
+     instead of prepending !aNULL:!eNULL:!EXP: (as was the case in 2.4.7
+     and later). Enables support for configuring the SUITEB* cipher
+     strings introduced in OpenSSL 1.0.2. PR 58213. [Kaspar Brand]
+
+  *) mod_ssl: Add support for extracting the msUPN and dnsSRV forms
+     of subjectAltName entries of type "otherName" into
+     SSL_{CLIENT,SERVER}_SAN_OTHER_{msUPN,dnsSRV}_n environment
+     variables. Addresses PR 58020. [Jan Pazdziora <jpazdziora redhat.com>,
+     Kaspar Brand]
+
+  *) mod_logio: Fix logging of %^FB (time to first byte) on the first request on
+     an SSL connection.  PR 58454.  
+     [Konstantin J. Chernov <k.j.chernov gmail.com>]
+
+  *) mod_cache: r->err_headers_out is not merged into
+     r->headers when mod_cache is enabled and the response
+     is cached for the first time. [Edward Lu]
+
+  *) mod_slotmem_shm: Fix slots/SHM files names on restart for systems that
+     can't create new (clear) slots while previous children gracefully stopping
+     still use the old ones (e.g. Windows, OS2). mod_proxy_balancer failed to
+     restart whenever the number of configured balancers/members changed during
+     restart.  PR 58024.  [Yann Ylavic]
+
+  *) core/util_script: make REDIRECT_URL a full URL.  PR 57785. [Nick Kew]
+
+  *) MPMs: Support SO_REUSEPORT to create multiple duplicated listener
+     records for scalability. [Yingqi Lu <yingqi.lu@intel.com>,
+     Jeff Trawick, Jim Jagielski, Yann Ylavic]
+
+  *) mod_alias: Introduce expression parser support for Alias, ScriptAlias
+     and Redirect. Limit Redirect expressions to directory (Location) context
+     and redirect statuses (implicit or explicit).
+     [Graham Leggett, Yann Ylavic, Ruediger Pluem]
+
+  *) mod_proxy: Fix a race condition that caused a failed worker to be retried
+     before the retry period is over. [Ruediger Pluem]
+
+  *) mod_autoindex: Allow autoindexes when neither mod_dir nor mod_mime are
+     loaded. [Eric Covener]
+
+  *) mod_rewrite:  Allow cookies set by mod_rewrite to contain ':' by accepting
+     ';' as an alternate separator.  PR47241. 
+     [<bugzilla schermesser com>, Eric Covener]
+
+  *) apxs: Add HTTPD_VERSION and HTTPD_MMN to the variables available with 
+     apxs -q. PR58202. [Daniel Shahaf <danielsh apache.org>]
+
+  *) mod_rewrite: Avoid a crash when lacking correct DB access permissions
+     when using RewriteMap with MapType dbd or fastdbd.  [Christophe Jaillet]
+
+  *) mod_authz_dbd: Avoid a crash when lacking correct DB access permissions.
+     PR 57868. [Jose Kahan <jose w3.org>, Yann Ylavic]
+
+  *) mod_socache_memcache: Add the 'MemcacheConnTTL' directive to control how 
+     long to keep idle connections with the memcache server(s).
+     Change default value from 600 usec (!) to 15 sec. PR 58091
+     [Christophe Jaillet]
+
+  *) mod_dir: Prevent the internal identifier "httpd/unix-directory" from
+     appearing as a Content-Type response header when requests for a directory
+     are rewritten by mod_rewrite. [Eric Covener]
+
+Changes with Apache 2.4.16
+
+  *) http: Fix LimitRequestBody checks when there is no more bytes to read.
+     [Michael Kaufmann <mail michael-kaufmann.ch>]
+
+  *) mod_alias: Revert expression parser support for Alias, ScriptAlias
+     and Redirect due to a regression (introduced in 2.4.13, not released).
+
+  *) mod_reqtimeout: Don't let pipelining checks and keep-alive times interfere
+     with the timeouts computed for subsequent requests.  PR 56729.
+     [Eric Covener, Yann Ylavic]
+
+  *) core: Avoid a possible truncation of the faulty header included in the
+     HTML response when LimitRequestFieldSize is reached.  [Yann Ylavic]
+
+  *) mod_ldap: In some case, LDAP_NO_SUCH_ATTRIBUTE could be returned instead
+     of an error during a compare operation. [Eric Covener]
+
+Changes with Apache 2.4.15 (not released)
+
+  *) mod_ext_filter, mod_charset_lite: Avoid inadvertent filtering of protocol
+     data during read of chunked request bodies. PR 58049. 
+     [Edward Lu <Chaosed0 gmail.com>]
+
+  *) mod_ldap: Stop leaking LDAP connections when 'LDAPConnectionPoolTTL 0' 
+     is configured.  PR 58037.  [Ted Phelps <phelps gnusto.com>]
+
+  *) core: Allow spaces after chunk-size for compatibility with implementations
+     using a pre-filled buffer.  [Yann Ylavic, Jeff Trawick]
+
+  *) mod_ssl: Remove deprecated SSLCertificateChainFile warning.
+     [Yann Ylavic]
+
+Changes with Apache 2.4.14 (not released)
+
+  *) SECURITY: CVE-2015-3183 (cve.mitre.org)
+     core: Fix chunk header parsing defect.
+     Remove apr_brigade_flatten(), buffering and duplicated code from
+     the HTTP_IN filter, parse chunks in a single pass with zero copy.
+     Limit accepted chunk-size to 2^63-1 and be strict about chunk-ext
+     authorized characters.  [Graham Leggett, Yann Ylavic]
+
+  *) SECURITY: CVE-2015-3185 (cve.mitre.org)
+     Replacement of ap_some_auth_required (unusable in Apache httpd 2.4)
+     with new ap_some_authn_required and ap_force_authn hook.  [Ben Reser]
+
+Changes with Apache 2.4.13 (not released)
+
+  *) SECURITY: CVE-2015-0253 (cve.mitre.org)
+     core: Fix a crash with ErrorDocument 400 pointing to a local URL-path 
+     with the INCLUDES filter active, introduced in 2.4.11. PR 57531. 
+     [Yann Ylavic]
+
+  *) SECURITY: CVE-2015-0228 (cve.mitre.org)
+     mod_lua: A maliciously crafted websockets PING after a script
+     calls r:wsupgrade() can cause a child process crash. 
+     [Edward Lu <Chaosed0 gmail.com>]
+
+  *) mod_proxy: Don't put the worker in error state for 500 or 503 errors
+     returned by the backend unless failonstatus is configured to.  PR 56925.
+     [Yann Ylavic]
+
+  *) core: Don't lowercase the argument to SetHandler if it begins with
+     "proxy:unix". PR 57968. [Eric Covener]
+
+  *) mod_ssl OCSP Stapling: Don't block initial handshakes while refreshing
+     the OCSP response for a different certificate.  mod_ssl has an additional
+     global mutex, "ssl-stapling-refresh".  PR 57131 (partial fix).
+     [Jeff Trawick]
+
+  *) mod_authz_dbm: Fix crashes when "dbm-file-group" is used and
+     authz modules were loaded in the "wrong" order.  [Joe Orton]
+
+  *) mod_authn_dbd, mod_authz_dbd, mod_session_dbd, mod_rewrite: Fix lifetime
+     of DB lookup entries independently of the selected DB engine.  PR 46421.
+     [Steven whitson <steven.whitson gmail com>, Jan Kaluza, Yann Ylavic].
+
+  *) In alignment with RFC 7525, the default recommended SSLCipherSuite
+     and SSLProxyCipherSuite now exclude RC4 as well as MD5. Also, the
+     default recommended SSLProtocol and SSLProxyProtocol directives now
+     exclude SSLv3. Existing configurations must be adjusted by the
+     administrator. [William Rowe]
+
+  *) mod_ssl: Add support for extracting subjectAltName entries of type
+     rfc822Name and dNSName into SSL_{CLIENT,SERVER}_SAN_{Email,DNS}_n
+     environment variables. Also addresses PR 57207. [Kaspar Brand]
+
+  *) dav_validate_request: avoid validating locks and ETags when there are
+     no If headers providing them on a resource we aren't modifying.
+     [Ben Reser]
+
+  *) mod_proxy_scgi: ProxySCGIInternalRedirect now allows an alternate
+     response header to be used by the application, for when the application
+     or framework is unable to return Location in the internal-redirect
+     form.  [Jeff Trawick]
+
+  *) core: Cleanup the request soon/even if some output filter fails to
+     handle the EOR bucket.  [Yann Ylavic]
+
+  *) mpm_event: Allow for timer events duplicates. [Jim Jagielski, Yann Ylavic]
+
+  *) mod_proxy, mod_ssl, mod_cache_socache, mod_socache_*: Support machine
+     readable server-status produced when using the "?auto" query string.
+     [Rainer Jung]
+
+  *) mod_status: Add more data to machine readable server-status produced
+     when using the "?auto" query string.  [Rainer Jung]
+
+  *) mod_ssl: Check for the Entropy Gathering Daemon (EGD) availability at
+     configure time (RAND_egd), and complain if SSLRandomSeed requires using
+     it otherwise.  [Bernard Spil <pil.oss gmail com>, Stefan Sperling,
+     Kaspar Brand]
+
+  *) mod_ssl: make sure to consistently output SSLCertificateChainFile
+     deprecation warnings, when encountered in a VirtualHost block.
+     [Falco Schwarz <hiding falco.me>]
+
+  *) mod_log_config: Add "%{UNIT}T" format to output request duration in
+     seconds, milliseconds or microseconds depending on UNIT ("s", "ms", "us").
+     [Ben Reser, Rainer Jung]
+
+  *) Allow FallbackResource to work when a directory is requested and
+     there is no autoindex nor DirectoryIndex. 
+     [Jack <tjerk.meesters gmail.com>, Eric Covener]
+
+  *) mod_proxy_wstunnel: Bypass the handler while the connection is not
+     upgraded to WebSocket, so that other modules can possibly take over
+     the leading HTTP requests.  [Yann Ylavic]
+
+  *) mod_http: Fix incorrect If-Match handling. PR 57358
+     [Kunihiko Sakamoto <ksakamoto google.com>]
+
+  *) mod_ssl: Add a warning if protocol given in SSLProtocol or SSLProxyProtocol
+     will override other parameters given in the same directive. This could be
+     a missing + or - prefix.  PR 52820 [Christophe Jaillet]
+
+  *) core, modules: Avoid error response/document handling by the core if some
+     handler or input filter already did it while reading the request (causing
+     a double response body).  [Yann Ylavic]
+
+  *) mod_proxy_ajp: Fix client connection errors handling and logged status
+     when it occurs.  PR 56823.  [Yann Ylavic]
+
+  *) mod_proxy: Use the correct server name for SNI in case the backend
+     SSL connection itself is established via a proxy server.
+     PR 57139 [Szabolcs Gyurko <szabolcs gyurko.org>]
+
+  *) mod_ssl: Fix possible crash when loading server certificate constraints.
+     PR 57694. [Paul Spangler <paul.spangler ni com>, Yann Ylavic]
+
+  *) build: Don't load both mod_cgi and mod_cgid in the default configuration
+     if they're both built.  [olli hauer <ohauer gmx.de>]
+
+  *) mod_logio: Add LogIOTrackTTFB and %^FB logformat to log the time 
+     taken to start writing response headers. [Eric Covener]
+
+  *) mod_ssl: Avoid compilation errors with LibreSSL related to
+     the use of ENGINE_CTRL_CHIL_SET_FORKCHECK. 
+     [Stuart Henderson <sthen openbsd.org>]
+
+  *) mod_proxy_http: Use the "Connection: close" header for requests to
+     backends not recycling connections (disablereuse), including the default
+     reverse and forward proxies.  [Yann Ylavic]
+
+  *) mod_proxy: Add ap_connection_reusable() for checking if a connection
+     is reusable as of this point in processing.  [Jeff Trawick]
+
+  *) mod_proxy_wstunnel: Avoid an empty response by failing with 502 (Bad
+     Gateway) when no response is ever received from the backend.
+     [Jan Kaluza]
+
+  *) core_filters: Restore/disable TCP_NOPUSH option after non-blocking
+     sendfile.  [Yann Ylavic]
+
+  *) mod_buffer: Forward flushed input data immediately and avoid (unlikely)
+     access to freed memory. [Yann Ylavic, Christophe Jaillet]
+
+  *) core: Add CGIPassAuth directive to control whether HTTP authorization
+     headers are passed to scripts as CGI variables.  PR 56855.  [Jeff 
+     Trawick]
+
+  *) core: Initialize scoreboard's used optional functions on graceful restarts
+     to avoid a crash when relocation occurs.  PR 57177.  [Yann Ylavic]
+
+  *) mod_dav: Avoid a potential integer underflow in the lock timeout value sent
+     back to a client. The answer to a LOCK request could be an extremly large
+     integer if the time needed to lock the resource was longer that the
+     requested timeout given in the LOCK request. In such a case, we now answer
+     "Second-0".  PR55420
+     [Christophe Jaillet]
+
+  *) mod_cgid: Within the first minute of a server start or restart, 
+     allow mod_cgid to retry connecting to its daemon process. Previously,
+     'No such file or directory: unable to connect to cgi daemon...' could
+     be logged without an actual retry. PR57685. 
+     [Edward Lu <Chaosed0 gmail.com>]
+
+  *) mod_proxy: Use the original (non absolute) form of the request-line's URI
+     for requests embedded in CONNECT payloads used to connect SSL backends via
+     a ProxyRemote forward-proxy.  PR 55892.  [Hendrik Harms <hendrik.harms
+     gmail com>, William Rowe, Yann Ylavic]
+
+  *) http: Make ap_die() robust against any HTTP error code and not modify
+     response status (finally logged) when nothing is to be done. PR 56035.
+     [Yann Ylavic]
+
+  *) mod_proxy_connect/wstunnel: If both client and backend sides get readable
+     at the same time, don't lose errors occurring while forwarding on the first
+     side when none occurs next on the other side, and abort.  [Yann Ylavic]
+
+  *) mod_rewrite: Improve relative substitutions in per-directory/htaccess
+     context for directories found by mod_userdir and mod_alias.  These no
+     longer require RewriteBase to be specified. [Eric Covener]
+
+  *) mod_proxy_http: Don't expect the backend to ack the "Connection: close" to
+     finally close those not meant to be kept alive by SetEnv proxy-nokeepalive
+     or force-proxy-request-1.0.  [Yann Ylavic]
+
+  *) core: If explicitly configured, use the KeepaliveTimeout value of the
+     virtual host which handled the latest request on the connection, or by
+     default the one of the first virtual host bound to the same IP:port.
+     PR56226.  [Yann Ylavic]
+
+  *) mod_lua: After a r:wsupgrade(), mod_lua was not properly
+     responding to a websockets PING but instead invoking the specified 
+     script. PR57524. [Edward Lu <Chaosed0 gmail.com>]
+
+  *) mod_ssl: Add the SSL_CLIENT_CERT_RFC4523_CEA variable, which provides
+     a combination of certificate serialNumber and issuer as defined by
+     CertificateExactMatch in RFC4523. [Graham Leggett]
+
+  *) core: Add expression support to ErrorDocument. Switch from a fixed
+     sized 664 byte array per merge to a hash table. [Graham Leggett]
+
+  *) ab: Add missing longest request (100%) to CSV export.
+     [Marcin Fabrykowski <bugzilla fabrykowski.pl>] 
+
+  *) mod_macro: Clear macros before initialization to avoid use-after-free
+     on startup or restart when the module is linked statically. PR 57525
+     [apache.org tech.futurequest.net, Yann Ylavic]
+
+  *) mod_alias: Introduce expression parser support for Alias, ScriptAlias
+     and Redirect. [Graham Leggett]
+
+  *) mod_ssl: 'SSLProtocol ALL' was being ignored in virtual host context. 
+     PR 57100.  [Michael Kaufmann <apache-bugzilla michael-kaufmann.ch>,
+     Yann Ylavic]
+
+  *) mpm_event: Avoid access to the scoreboard from the connection while
+     it is suspended (waiting for events).  [Eric Covener, Jeff Trawick]
+
+  *) mod_ssl: Fix renegotiation failures redirected to an ErrorDocument.
+     PR 57334.  [Yann Ylavic].
+
+  *) mod_deflate: A misplaced check prevents limiting small bodies with the
+     new inflate limits. PR56872. [Edward Lu, Eric Covener, Yann Ylavic]
+
+  *) mod_proxy_ajp: Forward SSL protocol name (SSLv3, TLSv1.1 etc.) as a
+     request attribute to the backend. Recent Tomcat versions will extract
+     it and provide it as a servlet request attribute named
+     "org.apache.tomcat.util.net.secure_protocol_version". [Rainer Jung]
+
+  *) core: Optimize string concatenation in expression parser when evaluating
+     a string expression. [Rainer Jung]
+
+  *) acinclude.m4: Generate #LoadModule directive in default httpd.conf for
+     every --enable-mpms-shared. PR 53882.  [olli hauer <ohauer gmx.de>,
+     Yann Ylavic]
+
+  *) mod_authn_dbd: Fix the error message logged in case of error while querying
+     the database. This is associated to AH01656 and AH01661. [Christophe Jaillet]
+
+  *) mod_authz_groupfile: Reduce the severity of AH01667 from ERROR to DEBUG,
+     because it may be evaluated inside <RequireAny>. PR55523. [Eric Covener] 
+
+  *) mod_ssl: Fix small memory leak during initialization when ECDH is used.
+     [Jan Kaluza]
+
+Changes with Apache 2.4.12
+
+  *) mpm_winnt: Accept utf-8 (Unicode) service names and descriptions for
+     internationalization.  [William Rowe]
+
+  *) mpm_winnt: Normalize the error and status messages emitted by service.c,
+     the service control interface for Windows.  [William Rowe]
+
+  *) configure: Fix --enable-v4-mapped configuration on *BSD. PR 53824.
+     [ olli hauer <ohauer gmx.de>, Yann Ylavic ]
+
+  *) Reverted <DirectoryMatch > behavior regression introduced in 2.4.11
+     (not released).
+
+Changes with Apache 2.4.11 (not released)
+
+  *) SECURITY: CVE-2014-3583 (cve.mitre.org)
+     mod_proxy_fcgi: Fix a potential crash due to buffer over-read, with 
+     response headers' size above 8K.  [Yann Ylavic, Jeff Trawick]
+
+  *) SECURITY: CVE-2014-3581 (cve.mitre.org)
+     mod_cache: Avoid a crash when Content-Type has an empty value.
+     PR 56924.  [Mark Montague <mark catseye.org>, Jan Kaluza]
+
+  *) SECURITY: CVE-2014-8109 (cve.mitre.org)
+     mod_lua: Fix handling of the Require line when a LuaAuthzProvider is
+     used in multiple Require directives with different arguments.
+     PR57204 [Edward Lu <Chaosed0 gmail.com>]
+
+  *) SECURITY: CVE-2013-5704 (cve.mitre.org)
+     core: HTTP trailers could be used to replace HTTP headers
+     late during request processing, potentially undoing or
+     otherwise confusing modules that examined or modified
+     request headers earlier.  Adds "MergeTrailers" directive to restore
+     legacy behavior.  [Edward Lu, Yann Ylavic, Joe Orton, Eric Covener]
+
+  *) mod_ssl: New directive SSLSessionTickets (On|Off).
+     The directive controls the use of TLS session tickets (RFC 5077),
+     default value is "On" (unchanged behavior).
+     Session ticket creation uses a random key created during web
+     server startup and recreated during restarts. No other key
+     recreation mechanism is available currently. Therefore using session
+     tickets without restarting the web server with an appropriate frequency
+     (e.g. daily) compromises perfect forward secrecy. [Rainer Jung]
+
+  *) mod_proxy_fcgi: Provide some basic alternate options for specifying 
+     how PATH_INFO is passed to FastCGI backends by adding significance to
+     the value of proxy-fcgi-pathinfo. PR 55329. [Eric Covener]
+
+  *) mod_proxy_fcgi: Enable UDS backends configured with SetHandler/RewriteRule
+     to opt-in to connection reuse and other Proxy options via explicitly
+     declared "proxy workers" (<Proxy unix:... enablereuse=on max=...)
+     [Eric Covener]
+
+  *) mod_proxy: Add "enablereuse" option as the inverse of "disablereuse".
+     [Eric Covener]
+
+  *) mod_proxy_fcgi: Enable opt-in to TCP connection reuse by explicitly
+     setting proxy option disablereuse=off. [Eric Covener] PR 57378.
+
+  *) event: Update the internal "connection id" when requests
+     move from thread to thread. Reuse can confuse modules like
+     mod_cgid. PR 57435. [Michael Thorpe <mike gistnet.com>]
+
+  *) mod_proxy_fcgi: Remove proxy:balancer:// prefix from SCRIPT_FILENAME
+     passed to fastcgi backends. [Eric Covener]
+
+  *) core: Configuration files with long lines and continuation characters
+     are not read properly. PR 55910. [Manuel Mausz <manuel-as mausz.at>]
+
+  *) mod_include: the 'env' function was incorrectly handled as 'getenv' if the
+     leading 'e' was written in upper case in <!--#if expr="..." -->
+     statements. [Christophe Jaillet]
+
+  *) split-logfile: Fix perl error:  'Can't use string ("example.org:80") 
+     as a symbol ref while "strict refs"'. PR 56329.
+     [Holger Mauermann <mauermann gmail.com>]
+
+  *) mod_proxy: Prevent ProxyPassReverse from doing a substitution when
+     the URL parameter interpolates to an empty string. PR 56603.
+     [<ajprout hotmail.com>]
+
+  *) core: Fix -D[efined] or <Define>[d] variables lifetime across restarts. 
+     PR 57328.  [Armin Abfalterer <a.abfalterer gmail.com>, Yann Ylavic].
+
+  *) mod_proxy: Preserve original request headers even if they differ
+     from the ones to be forwarded to the backend. PR 45387.
+     [Yann Ylavic]
+
+  *) mod_ssl: dump SSL IO/state for the write side of the connection(s),
+     like reads (level TRACE4). [Yann Ylavic]
+
+  *) mod_proxy_fcgi: Ignore body data from backend for 304 responses. PR 57198.
+     [Jan Kaluza]
+
+  *) mod_ssl: Do not crash when looking up SSL related variables during
+     expression evaluation on non SSL connections. PR 57070  [Ruediger Pluem]
+
+  *) mod_proxy_ajp: Fix handling of the default port (8009) in the
+     ProxyPass and <Proxy> configurations.  PR 57259.  [Yann Ylavic]
+
+  *) mpm_event: Avoid a possible use after free when notifying the end of
+     connection during lingering close.  PR 57268.  [Eric Covener, Yann Ylavic]
+
+  *) mod_ssl: Fix recognition of OCSP stapling responses that are encoded
+     improperly or too large.  [Jeff Trawick]
+
+  *) core: Add ap_log_data(), ap_log_rdata(), etc. for logging buffers.
+     [Jeff Trawick]
+
+  *) mod_proxy_fcgi, mod_authnz_fcgi: stop reading the response and issue an
+     error when parsing or forwarding the response fails. [Yann Ylavic]
+
+  *) mod_ssl: Fix a memory leak in case of graceful restarts with OpenSSL >= 0.9.8e
+     PR 53435 [tadanori <tadanori2007 yahoo.com>, Sebastian Wiedenroth <wiedi frubar.net>]
+
+  *) mod_proxy_connect: Don't issue AH02447 on sockets hangups, let the read
+     determine whether it is a normal close or a real error. PR 57168. [Yann
+     Ylavic]
+
+  *) mod_proxy_wstunnel: abort backend connection on polling error to avoid
+     further processing.  [Yann Ylavic]
+
+  *) core: Support custom ErrorDocuments for HTTP 501 and 414 status codes.
+     PR 57167 [Edward Lu <Chaosed0 gmail.com>]
+
+  *) mod_proxy_connect: Fix ProxyRemote to https:// backends on EBCDIC 
+     systems. PR 57092 [Edward Lu <Chaosed0 gmail.com>]
+
+  *) mod_cache: Avoid a 304 response to an unconditional requst when an AH00752
+     CacheLock error occurs during cache revalidation. [Eric Covener]
+
+  *) mod_ssl: Move OCSP stapling information from a per-certificate store to
+     a per-server hash. PR 54357, PR 56919. [Alex Bligh <alex alex.org.uk>,
+     Yann Ylavic, Kaspar Brand]
+
+  *) mod_cache_socache: Change average object size hint from 32 bytes to
+     2048 bytes.  [Rainer Jung]
+
+  *) mod_cache_socache: Add cache status to server-status.  [Rainer Jung]
+
+  *) event: Fix worker-listener deadlock in graceful restart.
+     PR 56960.
+
+  *) Concat strings at compile time when possible. PR 53741.
+
+  *) mod_substitute: Restrict configuration in .htaccess to
+     FileInfo as documented.  [Rainer Jung]
+
+  *) mod_substitute: Make maximum line length configurable.  [Rainer Jung]
+
+  *) mod_substitute: Fix line length limitation in case of regexp plus flatten.
+     [Rainer Jung]
+
+  *) mod_proxy: Truncated character worker names are no longer fatal
+     errors. PR53218. [Jim Jagielski]
+
+  *) mod_dav: Set r->status_line in dav_error_response. PR 55426.
+
+  *) mod_proxy_http, mod_cache: Avoid (unlikely) accesses to freed memory.
+     [Yann Ylavic, Christophe Jaillet]
+
+  *) http_protocol: fix logic in ap_method_list_(add|remove) in order:
+       - to correctly reset bits
+       - not to modify the 'method_mask' bitfield unnecessarily
+     [Christophe Jaillet]
+
+  *) mod_slotmem_shm: Increase log level for some originally debug messages.
+     [Jim Jagielski]
+
+  *) mod_ldap: In 2.4.10, some LDAP searches or comparisons might be done with
+     the wrong credentials when a backend connection is reused.
+     [Eric Covener]
+
+  *) mod_macro: Add missing APLOGNO for some Warning log messages.
+     [Christophe Jaillet]
+
+  *) mod_cache: Avoid sending 304 responses during failed revalidations
+     PR56881. [Eric Covener]
+
+  *) mod_status: Honor client IP address using mod_remoteip. PR 55886.
+     [Jim Jagielski]
+
+  *) cmake-based build for Windows: Fix incompatibility with cmake 2.8.12
+     and later.  PR 56615.  [Chuck Liu <cliu81 gmail.com>, Jeff Trawick]
+
+  *) mod_ratelimit: Drop severity of AH01455 and AH01457 (ap_pass_brigade
+     failed) messages from ERROR to TRACE1.  Other filters do not bother 
+     re-reporting failures from lower level filters.  PR56832.  [Eric Covener]
+
+  *) core: Avoid useless warning message when parsing a section guarded by
+     <IfDefine foo> if $(foo) is used within the section.
+     PR 56503 [Christophe Jaillet]
+
+  *) mod_proxy_fcgi: Fix faulty logging of large amounts of stderr from the
+     application.  PR 56858.  [Manuel Mausz <manuel-asf mausz.at>]
+
+  *) mod_proxy_http: Proxy responses with error status and
+     "ProxyErrorOverride On" hang until proxy timeout.
+     PR53420 [Rainer Jung]
+
+  *) mod_log_config: Allow three character log formats to be registered. For
+     backwards compatibility, the first character of a three-character format
+     must be the '^' (caret) character.  [Eric Covener]
+
+  *) mod_lua: Don't quote Expires and Path values. PR 56734.
+     [Keith Mashinter, <kmashint yahoo com>]
+
+  *) mod_authz_core: Allow <AuthzProviderAlias>'es to be seen from auth
+     stanzas under virtual hosts. PR 56870. [Eric Covener]
+
+Changes with Apache 2.4.10
+
+  *) SECURITY: CVE-2014-0117 (cve.mitre.org)
+     mod_proxy: Fix crash in Connection header handling which allowed a denial
+     of service attack against a reverse proxy with a threaded MPM.
+     [Ben Reser]
+
+  *) SECURITY: CVE-2014-3523 (cve.mitre.org)
+     Fix a memory consumption denial of service in the WinNT MPM, used in all
+     Windows installations. Workaround: AcceptFilter <protocol> {none|connect}
+     [Jeff Trawick]
+
+  *) SECURITY: CVE-2014-0226 (cve.mitre.org)
+     Fix a race condition in scoreboard handling, which could lead to
+     a heap buffer overflow.  [Joe Orton, Eric Covener]
+
+  *) SECURITY: CVE-2014-0118 (cve.mitre.org)
+     mod_deflate: The DEFLATE input filter (inflates request bodies) now
+     limits the length and compression ratio of inflated request bodies to
+     avoid denial of service via highly compressed bodies.  See directives
+     DeflateInflateLimitRequestBody, DeflateInflateRatioLimit,
+     and DeflateInflateRatioBurst. [Yann Ylavic, Eric Covener]
+
+  *) SECURITY: CVE-2014-0231 (cve.mitre.org)
+     mod_cgid: Fix a denial of service against CGI scripts that do
+     not consume stdin that could lead to lingering HTTPD child processes
+     filling up the scoreboard and eventually hanging the server.  By
+     default, the client I/O timeout (Timeout directive) now applies to
+     communication with scripts.  The CGIDScriptTimeout directive can be
+     used to set a different timeout for communication with scripts.
+     [Rainer Jung, Eric Covener, Yann Ylavic]
+
+  *) mod_ssl: Extend the scope of SSLSessionCacheTimeout to sessions
+     resumed by TLS session resumption (RFC 5077). [Rainer Jung]
+
+  *) mod_deflate: Don't fail when flushing inflated data to the user-agent
+     and that coincides with the end of stream ("Zlib error flushing inflate
+     buffer"). PR 56196. [Christoph Fausak <christoph fausak glueckkanja.com>]
+
+  *) mod_proxy_ajp: Forward local IP address as a custom request attribute
+     like we already do for the remote port. [Rainer Jung]
+
+  *) core: Include any error notes set by modules in the canned error
+     response for 403 errors.  [Jeff Trawick]
+
+  *) mod_ssl: Set an error note for requests rejected due to
+     SSLStrictSNIVHostCheck.  [Jeff Trawick]
+
+  *) mod_ssl: Fix issue with redirects to error documents when handling
+     SNI errors.  [Jeff Trawick]
+
+  *) mod_ssl: Fix tmp DH parameter leak, adjust selection to prefer
+     larger keys and support up to 8192-bit keys.  [Ruediger Pluem,
+     Joe Orton]
+
+  *) mod_dav: Fix improper encoding in PROPFIND responses.  PR 56480.
+     [Ben Reser]
+
+  *) WinNT MPM: Improve error handling for termination events in child.
+     [Jeff Trawick]
+
+  *) mod_proxy: When ping/pong is configured for a worker, don't send or
+     forward "100 Continue" (interim) response to the client if it does
+     not expect one. [Yann Ylavic]
+
+  *) mod_ldap: Be more conservative with the last-used time for
+     LDAPConnectionPoolTTL. PR54587 [Eric Covener]
+
+  *) mod_ldap: LDAP connections used for authn were not respecting
+     LDAPConnectionPoolTTL. PR54587 [Eric Covener]
+
+  *) mod_proxy_fcgi: Fix occasional high CPU when handling request bodies.
+     [Jeff Trawick]
+
+  *) event MPM: Fix possible crashes (third-party modules accessing c->sbh) 
+     or occasional missed mod_status updates under load. PR 56639.
+     [Edward Lu <Chaosed0 gmail com>]
+
+  *) mod_authnz_ldap: Support primitive LDAP servers do not accept
+     filters, such as "SDBM-backed LDAP" on z/OS, by allowing a special
+     filter "none" to be specified in AuthLDAPURL. [Eric Covener]
+
+  *) mod_deflate: Fix inflation of files larger than 4GB. PR 56062.
+     [Lukas Bezdicka <social v3.sk>]
+
+  *) mod_deflate: Handle Zlib header and validation bytes received in multiple
+     chunks. PR 46146. [Yann Ylavic]
+
+  *) mod_proxy: Allow reverse-proxy to be set via explicit handler.
+     [ryo takatsuki <ryotakatsuki gmail com>]
+
+  *) ab: support custom HTTP method with -m argument. PR 56604.
+     [Roman Jurkov <winfinit gmail.com>]
+
+  *) mod_proxy_balancer: Correctly encode user provided data in management
+     interface. PR 56532 [Maksymilian, <max cert.cx>]
+
+  *) mod_proxy: Don't limit the size of the connectable Unix Domain Socket
+     paths. [Graham Dumpleton, Christophe Jaillet, Yann Ylavic]
+
+  *) mod_proxy_fcgi: Support iobuffersize parameter.  [Jeff Trawick]
+
+  *) event: Send the SSL close notify alert when the KeepAliveTimeout
+     expires. PR54998. [Yann Ylavic] 
+
+  *) mod_ssl: Ensure that the SSL close notify alert is flushed to the client.
+     PR54998. [Tim Kosse <tim.kosse filezilla-project.org>, Yann Ylavic] 
+
+  *) mod_proxy: Shutdown (eg. SSL close notify) the backend connection before
+     closing. [Yann Ylavic] 
+
+  *) mod_auth_form: Add a debug message when the fields on a form are not
+     recognised. [Graham Leggett]
+
+  *) mod_cache: Preserve non-cacheable headers forwarded from an origin 304
+     response. PR 55547.  [Yann Ylavic]
+
+  *) mod_proxy_wstunnel: Fix the use of SSL connections with the "wss:"
+     scheme. PR55320. [Alex Liu <alex.leo.ca gmail.com>]
+
+  *) mod_socache_shmcb: Correct counting of expirations for status display.
+     Expirations happening during retrieval were not counted. [Rainer Jung]
+
+  *) mod_cache: Retry unconditional request with the full URL (including the
+     query-string) when the origin server's 304 response does not match the
+     conditions used to revalidate the stale entry.  [Yann Ylavic].
+
+  *) mod_alias: Stop setting CONTEXT_PREFIX and CONTEXT_DOCUMENT environment
+     variables as a result of AliasMatch. [Eric Covener]
+
+  *) mod_cache: Don't add cached/revalidated entity headers to a 304 response.
+     PR 55547.  [Yann Ylavic]
+
+  *) mod_proxy_scgi: Support Unix sockets.  ap_proxy_port_of_scheme():
+     Support default SCGI port (4000).  [Jeff Trawick]
+
+  *) mod_cache: Fix AH00784 errors on Windows when the the CacheLock directive
+     is enabled.  [Eric Covener]
+
+  *) mod_expires: don't add Expires header to error responses (4xx/5xx),
+     be they generated or forwarded. PR 55669.  [Yann Ylavic]
+
+  *) mod_proxy_fcgi: Don't segfault when failing to connect to the backend.
+     (regression in 2.4.9 release) [Jeff Trawick]
+
+  *) mod_authn_socache: Fix crash at startup in certain configurations.
+     PR 56371. (regression in 2.4.7) [Jan Kaluza]
+
+  *) mod_ssl: restore argument structure for "exec"-type SSLPassPhraseDialog
+     programs to the form used in releases up to 2.4.7, and emulate
+     a backwards-compatible behavior for existing setups. [Kaspar Brand]
+
+  *) mod_ssl: Add SSLOCSPUseRequestNonce directive to control whether or not
+     OCSP requests should use a nonce to be checked against the responder's
+     one. PR 56233. [Yann Ylavic, Kaspar Brand]
+
+  *) mod_ssl: "SSLEngine off" will now override a Listen-based default
+     and does disable mod_ssl for the vhost.  [Joe Orton]
+
+  *) mod_lua: Enforce the max post size allowed via r:parsebody()
+     [Daniel Gruno]
+
+  *) mod_lua: Use binary comparison to find boundaries for multipart 
+     objects, as to not terminate our search prematurely when hitting
+     a NULL byte. [Daniel Gruno]
+
+  *) mod_ssl: add workaround for SSLCertificateFile when using OpenSSL
+     versions before 0.9.8h and not specifying an SSLCertificateChainFile
+     (regression introduced with 2.4.8). PR 56410. [Kaspar Brand]
+
+  *) mod_ssl: bring SNI behavior into better conformance with RFC 6066:
+     no longer send warning-level unrecognized_name(112) alerts,
+     and limit startup warnings to cases where an OpenSSL version
+     without TLS extension support is used. PR 56241. [Kaspar Brand]
+
+  *) mod_proxy_html: Avoid some possible memory access violation in case of
+     specially crafted files, when the ProxyHTMLMeta directive is turned on.
+     Follow up of PR 56287 [Christophe Jaillet]
+
+  *) mod_auth_form: Make sure the optional functions are loaded even when
+     the AuthFormProvider isn't specified. [Graham Leggett]
+
+  *) mod_ssl: avoid processing bogus SSLCertificateKeyFile values
+     (and logging garbled file names). PR 56306. [Kaspar Brand]
+
+  *) mod_ssl: fix merging of global and vhost-level settings with the
+     SSLCertificateFile, SSLCertificateKeyFile, and SSLOpenSSLConfCmd
+     directives. PR 56353. [Kaspar Brand]
+
+  *) mod_headers: Allow the "value" parameter of Header and RequestHeader to 
+     contain an ap_expr expression if prefixed with "expr=". [Eric Covener]
+
+  *) rotatelogs: Avoid creation of zombie processes when -p is used on
+     Unix platforms.  [Joe Orton]
+
+  *) mod_authnz_fcgi: New module to enable FastCGI authorizer
+     applications to authenticate and/or authorize clients.
+     [Jeff Trawick]
+
+  *) mod_proxy: Do not try to parse the regular expressions passed by
+     ProxyPassMatch as URL as they do not follow their syntax.
+     PR 56074. [Ruediger Pluem]
+
+  *) mod_reqtimeout: Resolve unexpected timeouts on keepalive requests 
+     under the Event MPM. PR56216.  [Frank Meier <frank meier ergon ch>]
+
+  *) mod_proxy_fcgi: Fix sending of response without some HTTP headers
+     that might be set by filters.  PR 55558. [Jim Riggs <jim riggs.me>]
+
+  *) mod_proxy_html: Do not delete the wrong data from HTML code when a
+     "http-equiv" meta tag specifies a Content-Type behind any other
+     "http-equiv" meta tag. PR 56287 [Micha Lenk <micha lenk info>]
+
+  *) mod_proxy: Don't reuse a SSL backend connection whose requested SNI
+     differs. PR 55782.  [Yann Ylavic]
+
+  *) Add suspend_connection and resume_connection hooks to notify modules
+     when the thread/connection relationship changes.  (Should be implemented
+     for any third-party async MPMs.)  [Jeff Trawick]
+
+  *) mod_proxy_wstunnel: Don't issue AH02447 and log a 500 on routine 
+     hangups from websockets origin servers. PR 56299
+     [Yann Ylavic, Edward Lu <Chaosed0 gmail com>, Eric Covener] 
+
+  *) mod_proxy_wstunnel: Don't pool backend websockets connections,
+     because we need to handshake every time. PR 55890.
+     [Eric Covener]
+
+  *) mod_lua: Redesign how request record table access behaves,
+     in order to utilize the request record from within these tables.
+     [Daniel Gruno]
+
+  *) mod_lua: Add r:wspeek for peeking at WebSocket frames. [Daniel Gruno]
+
+  *) mod_lua: Log an error when the initial parsing of a Lua file fails.
+     [Daniel Gruno, Felipe Daragon <filipe syhunt com>]
+
+  *) mod_lua: Reformat and escape script error output.
+     [Daniel Gruno, Felipe Daragon <filipe syhunt com>]
+
+  *) mod_lua: URL-escape cookie keys/values to prevent tainted cookie data
+     from causing response splitting.
+     [Daniel Gruno, Felipe Daragon <filipe syhunt com>]
+
+  *) mod_lua: Disallow newlines in table values inside the request_rec, 
+     to prevent HTTP Response Splitting via tainted headers.
+     [Daniel Gruno, Felipe Daragon <filipe syhunt com>]
+
+  *) mod_lua: Remove the non-working early/late arguments for 
+     LuaHookCheckUserID. [Daniel Gruno]
+
+  *) mod_lua: Change IVM storage to use shm [Daniel Gruno]
+
+  *) mod_lua: More verbose error logging when a handler function cannot be
+     found. [Daniel Gruno]
+
+Changes with Apache 2.4.9
+
+  *) mod_ssl: Work around a bug in some older versions of OpenSSL that
+     would cause a crash in SSL_get_certificate for servers where the
+     certificate hadn't been sent. [Stephen Henson]
+
+  *) mod_lua: Add a fixups hook that checks if the original request is intended 
+     for LuaMapHandler. This fixes a bug where FallbackResource invalidates the 
+     LuaMapHandler directive in certain cases by changing the URI before the map 
+     handler code executes [Daniel Gruno, Daniel Ferradal <dferradal gmail com>].
+
+Changes with Apache 2.4.8 (not released)
+
+  *) SECURITY: CVE-2014-0098 (cve.mitre.org)
+     Clean up cookie logging with fewer redundant string parsing passes.
+     Log only cookies with a value assignment. Prevents segfaults when
+     logging truncated cookies.
+     [William Rowe, Ruediger Pluem, Jim Jagielski]
+
+  *) SECURITY: CVE-2013-6438 (cve.mitre.org)
+     mod_dav: Keep track of length of cdata properly when removing
+     leading spaces. Eliminates a potential denial of service from
+     specifically crafted DAV WRITE requests
+     [Amin Tora <Amin.Tora neustar.biz>]
+
+  *) core: Support named groups and backreferences within the LocationMatch,
+     DirectoryMatch, FilesMatch and ProxyMatch directives. (Requires
+     non-ancient PCRE library) [Graham Leggett]
+
+  *) core: draft-ietf-httpbis-p1-messaging-23 corrections regarding
+     TE/CL conflicts. [Yann Ylavic, Jim Jagielski]
+
+  *) core: Detect incomplete request and response bodies, log an error and
+     forward it to the underlying filters. PR 55475 [Yann Ylavic]
+
+  *) mod_dir: Add DirectoryCheckHandler to allow a 2.2-like behavior, skipping 
+     execution when a handler is already set. PR53929. [Eric Covener]
+
+  *) mod_ssl: Do not perform SNI / Host header comparison in case of a
+     forward proxy request. [Ruediger Pluem]
+
+  *) mod_ssl: Remove the hardcoded algorithm-type dependency for the
+     SSLCertificateFile and SSLCertificateKeyFile directives, to enable
+     future algorithm agility, and deprecate the SSLCertificateChainFile
+     directive (obsoleted by SSLCertificateFile). [Kaspar Brand]
+
+  *) mod_rewrite: Add RewriteOptions InheritDown, InheritDownBefore, 
+     and IgnoreInherit to allow RewriteRules to be pushed from parent scopes
+     to child scopes without explicitly configuring each child scope.
+     PR56153.  [Edward Lu <Chaosed0 gmail com>] 
+
+  *) prefork: Fix long delays when doing a graceful restart.
+     PR 54852 [Jim Jagielski, Arkadiusz Miskiewicz <arekm maven pl>]
+
+  *) FreeBSD: Disable IPv4-mapped listening sockets by default for versions
+     5+ instead of just for FreeBSD 5. PR 53824. [Jeff Trawick]
+
+  *) mod_proxy_wstunnel: Avoid busy loop on client errors, drop message
+     IDs 02445, 02446, and 02448 to TRACE1 from DEBUG. PR 56145.
+     [Joffroy Christen <joffroy.christen solvaxis com>, Eric Covener]
+
+  *) mod_remoteip: Correct the trusted proxy match test. PR 54651.
+     [Yoshinori Ehara <yoshinori ehara gmail com>, Eugene L <eugenel amazon com>]
+
+  *) mod_proxy_fcgi: Fix error message when an unexpected protocol version
+     number is received from the application.  PR 56110.  [Jeff Trawick]
+
+  *) mod_remoteip: Use the correct IP addresses to populate the proxy_ips field.
+     PR 55972. [Mike Rumph]
+
+  *) mod_lua: Update r:setcookie() to accept a table of options and add domain,
+     path and httponly to the list of options available to set.
+     PR 56128 [Edward Lu <Chaosed0 gmail com>, Daniel Gruno]
+

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