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                                                         -*- coding: utf-8 -*-
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Changes with Apache 2.4.21

  *) 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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  *) 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 enviroment 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_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
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