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

  *) 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 enviroment variable names
     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]
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