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                                                         -*- coding: utf-8 -*-
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Changes with Apache 2.4.19

  *) 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]

  *) mod_rewrite: Avoid looping on relative substitutions that
     result in the same filename we started with. PR 58854.
     [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: connection 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: new config directives and the implementation behind
     them: H2Timeout, H2KeepAliveTimeout, H2StreamTimeout. Documentation in
     the http2 manual.
     [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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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 reponse 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]
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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.
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