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                                                         -*- coding: utf-8 -*-
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Changes with Apache 2.4.24

  *) mod_http2: CVE-2016-8740: Mitigate DoS memory exhaustion via endless
     CONTINUATION frames.
     [Naveen Tiwari <naveen.tiwari@asu.edu> and CDF/SEFCOM at Arizona State University, Stefan Eissing]

  *) 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]
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  *) 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]
  
  *) core: CVE-2016-5387: Mitigate [f]cgi "httpoxy" issues.
     [Dominic Scheirlinck <dominic vendhq.com>, Yann Ylavic]

  *) mod_proxy_{http,ajp,fcgi}: don't reuse backend connections with data
     available before the request is sent.  PR 57832.  [Yann Ylavic]

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  *) 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]

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  *) mod_proxy: Correctly consider error response codes by the backend when
     processing failonstatus. PR 59869 [Ruediger Pluem]

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  *) mod_dav: Add dav_get_provider_name() function to obtain the name
     of the provider from mod_dav.  [Graham Leggett]

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  *) 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

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  *) 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]
     
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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]
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Changes with Apache 2.4.22

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  *) mod_http2: fix for request abort when connections drops, introduced in
     1.5.8

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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 Čibej]

  *) 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]
     
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  *) 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.
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Changes with Apache 2.4.20

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  *) SECURITY: CVE-2016-1546 (cve.mitre.org)     
     mod_http2: restricting number of concurrent stream workers per connection
     if client is slow. 

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  *) core: Do not read .htaccess if AllowOverride and AllowOverrideList
     are "None". PR 58528.
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     [Michael Schlenker <msc contact.de, Ruediger Pluem, Daniel Ruggeri]
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  *) mod_proxy_express: Fix possible use of DB handle after close.  PR 59230.
     [Petr <pgajdos suse.cz>]
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  *) core/util_script: relax alphanumeric filter of environment variable names
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     on Windows to allow '(' and ')' for passing PROGRAMFILES(X86) et.al.
     unadulterated in 64 bit versions of Windows. PR 46751.
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     [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]
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  *) 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]

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  *) 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.
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     [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]
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  *) 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]

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Changes with Apache 2.4.18

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  *) 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]
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  *) 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
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     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]
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Changes with Apache 2.4.17
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  *) 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]

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  *) 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]

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  *) 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>]

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  *) 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]
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Changes with Apache 2.4.16

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  *) 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)
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  *) SECURITY: CVE-2015-0253 (cve.mitre.org)
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     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]
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  *) 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]
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  *) 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]

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  *) 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]

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  *) 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>]

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  *) 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]

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  *) 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
  *) 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
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     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]

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  *) 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]