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                                                         -*- coding: utf-8 -*-
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Changes with Apache 2.4.39

  *) mod_proxy/ssl: Cleanup per-request SSL configuration anytime a backend
     connection is recycled/reused to avoid a possible crash with some SSLProxy
     configurations in <Location> or <Proxy> context. PR 63256. [Yann Ylavic]

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  *) mod_ssl: Correctly restore SSL verify state after TLSv1.3 PHA failure.
     [Michael Kaufmann <mail michael-kaufmann.ch>]

  *) mod_log_config: Support %{c}h for conn-hostname, %h for useragent_host
     PR 55348

  *) mod_socache_redis: Support for Redis as socache storage provider.

  *) core: new configuration option 'MergeSlashes on|off' that controls handling of
     multiple, consecutive slash ('/') characters in the path component of the request URL.
     [Eric Covener]
     
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  *) mod_http2: when SSL renegotiation is inhibited and a 403 ErrorDocument is
     in play, the proper HTTP/2 stream reset did not trigger with H2_ERR_HTTP_1_1_REQUIRED.
     Fixed. [Michael Kaufmann] 

  *) mod_http2: new configuration directive: `H2Padding numbits` to control 
     padding of HTTP/2 payload frames. 'numbits' is a number from 0-8,
     controlling the range of padding bytes added to a frame. The actual number
     added is chosen randomly per frame. This applies to HEADERS, DATA and PUSH_PROMISE
     frames equally. The default continues to be 0, e.g. no padding. [Stefan Eissing] 
  
  *) mod_http2: ripping out all the h2_req_engine internal features now that mod_proxy_http2
     has no more need for it. Optional functions are still declared but no longer implemented.
     While previous mod_proxy_http2 will work with this, it is recommeneded to run the matching
     versions of both modules. [Stefan Eissing]
  
  *) mod_proxy_http2: changed mod_proxy_http2 implementation and fixed several bugs which
     resolve PR63170. The proxy module does now a single h2 request on the (reused)
     connection and returns. [Stefan Eissing]
  
  *) mod_http2/mod_proxy_http2: proxy_http2 checks correct master connection aborted status 
     to trigger immediate shutdown of backend connections. This is now always signalled
     by mod_http2 when the the session is being released. 
     proxy_http2 now only sends a PING frame to the backend when there is not already one
     in flight. [Stefan Eissing]

  *) mod_proxy_http2: fixed an issue where a proxy_http2 handler entered an infinite 
     loop when encountering certain errors on the backend connection. 
     See <https://bz.apache.org/bugzilla/show_bug.cgi?id=63170>. [Stefan Eissing]

  *) mod_http2: Configuration directives H2Push and H2Upgrade can now be specified per 
     Location/Directory, e.g. disabling PUSH for a specific set of resources. [Stefan Eissing]

  *) mod_http2: HEAD requests to some module such as mod_cgid caused the stream to
     terminate improperly and cause a HTTP/2 PROTOCOL_ERROR. 
     Fixes <https://github.com/icing/mod_h2/issues/167>. [Michael Kaufmann]

  *) http: Fix possible empty response with mod_ratelimit for HEAD requests.
     PR 63192. [Yann Ylavic]

  *) mod_cache_socache: Avoid reallocations and be safe with outgoing data
     lifetime. [Yann Ylavic]

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  *) MPMs unix: bind the bucket number of each child to its slot number, for a
     more efficient per bucket maintenance. [Yann Ylavic]

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  *) mod_auth_digest: Fix a race condition. Authentication with valid
     credentials could be refused in case of concurrent accesses from
     different users.  PR 63124.  [Simon Kappel <simon.kappel axis.com>]

  *) mod_http2: enable re-use of slave connections again. Fixed slave connection
     keepalives counter. [Stefan Eissing]

  *) mod_reqtimeout: Allow to configure (TLS-)handshake timeouts.
     PR 61310. [Yann Ylavic]

  *) mod_proxy_wstunnel: Fix websocket proxy over UDS.
     PR 62932 <pavel dcmsys.com>

  *) mod_ssl: Don't unset FIPS mode on restart unless it's forced by
     configuration (SSLFIPS on) and not active by default in OpenSSL.
     PR 63136. [Yann Ylavic]
Changes with Apache 2.4.38

  *) SECURITY: CVE-2018-17199 (cve.mitre.org)
     mod_session: mod_session_cookie does not respect expiry time allowing
     sessions to be reused.  [Hank Ibell]

  *) SECURITY: CVE-2018-17189 (cve.mitre.org)
     mod_http2: fixes a DoS attack vector. By sending slow request bodies
     to resources not consuming them, httpd cleanup code occupies a server
     thread unnecessarily. This was changed to an immediate stream reset
     which discards all stream state and incoming data.  [Stefan Eissing]

  *) SECURITY: CVE-2019-0190 (cve.mitre.org)
     mod_ssl: Fix infinite loop triggered by a client-initiated
     renegotiation in TLSv1.2 (or earlier) with OpenSSL 1.1.1 and
     later.  PR 63052.  [Joe Orton]

  *) mod_ssl: Clear retry flag before aborting client-initiated renegotiation.
     PR 63052 [Joe Orton]

  *) mod_negotiation: Treat LanguagePriority as case-insensitive to match
     AddLanguage behavior and HTTP specification. PR 39730 [Christophe Jaillet]
  
  *) mod_md: incorrect behaviour when synchronizing ongoing ACME challenges
     have been fixed. [Michael Kaufmann, Stefan Eissing]
  
  *) mod_setenvif: We can have expressions that become true if a regex pattern
     in the expression does NOT match. In this case val is NULL
     and we should just set the value for the environment variable 
     like in the pattern case. [Ruediger Pluem]
  *) mod_session: Always decode session attributes early. [Hank Ibell]

  *) core: Incorrect values for environment variables are substituted when
     multiple environment variables are specified in a directive. [Hank Ibell]

  *) mod_rewrite: Only create the global mutex used by "RewriteMap prg:" when
     this type of map is present in the configuration.  PR62311.  
     [Hank Ibell <hwibell gmail.com>]

  *) mod_dav: Fix invalid Location header when a resource is created by
     passing an absolute URI on the request line [Jim Jagielski]

  *) mod_session_cookie: avoid duplicate Set-Cookie header in the response.
     [Emmanuel Dreyfus <manu@netbsd.org>, Luca Toscano]

  *) mod_ssl: clear *SSL errors before loading certificates and checking
     afterwards. Otherwise errors are reported when other SSL using modules
     are in play. Fixes PR 62880. [Michael Kaufmann]

  *) mod_ssl: Fix the error code returned in an error path of
     'ssl_io_filter_handshake()'. This messes-up error handling performed
     in 'ssl_io_filter_error()' [Yann Ylavic]

  *) mod_ssl: Fix $HTTPS definition for "SSLEngine optional" case, and fix
     authz provider so "Require ssl" works correctly in HTTP/2.
     PR 61519, 62654.  [Joe Orton, Stefan Eissing]

  *) mod_proxy: If ProxyPassReverse is used for reverse mapping of relative
     redirects, subsequent ProxyPassReverse statements, whether they are
     relative or absolute, may fail.  PR 60408.  [Peter Haworth <pmh1wheel gmail.com>]
  
  *) mod_lua: Now marked as a stable module [https://s.apache.org/Xnh1]
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Changes with Apache 2.4.37

  *) mod_ssl: Fix HTTP/2 failures when using OpenSSL 1.1.1. [Rainer Jung]

  *) mod_ssl: Fix crash during SSL renegotiation with OptRenegotiate set,
     when client certificates are available from the original handshake
     but were originally not verified and should get verified now.
     This is a regression in 2.4.36 (unreleased). [Ruediger Pluem]

  *) mod_ssl: Correctly merge configurations that have client certificates set
     by SSLProxyMachineCertificate{File|Path}. [Ruediger Pluem]

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Changes with Apache 2.4.36

  *) mod_brotli, mod_deflate: Restore the separate handling of 304 Not Modified
     responses. Regression introduced in 2.4.35.

  *) mod_proxy_scgi, mod_proxy_uwsgi: improve error handling when sending the
     body of the response. [Jim Jagielski]

  *) mpm_event: Stop issuing AH00484 "server reached MaxRequestWorkers..." when
     there are still idle threads available. When there are less idle threads than
     MinSpareThreads, issue new one-time message AH10159. Matches worker MPM.
     [Eric Covener]

  *) mod_http2: adding defensive code for stream EOS handling, in case the request handler
     missed to signal it the normal way (eos buckets). Addresses github issues 
     https://github.com/icing/mod_h2/issues/164, https://github.com/icing/mod_h2/issues/167
     and https://github.com/icing/mod_h2/issues/170. [Stefan Eissing] 

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  *) ab: Add client certificate support.  PR 55774.  [Graham Leggett]
  *) ab: Disable printing temp key for OpenSSL before
     version 1.0.2. SSL_get_server_tmp_key is not available
     there. [Rainer Jung]

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  *) mod_ssl: Fix a regression that the configuration settings for verify mode
     and verify depth were taken from the frontend connection in case of
     connections by the proxy to the backend. PR 62769. [Ruediger Pluem]

  *) MPMs: Initialize all runtime/asynchronous objects on a dedicated pool and
     before signals handling to avoid lifetime issues on restart or shutdown.
     PR 62658. [Yann Ylavic]

  *) mod_ssl: Add support for OpenSSL 1.1.1 and TLSv1.3.  TLSv1.3 has
     behavioural changes compared to v1.2 and earlier; client and
     configuration changes should be expected.  SSLCipherSuite is
     enhanced for TLSv1.3 ciphers, but applies at vhost level only.
     [Stefan Eissing, Yann Ylavic, Ruediger Pluem, Joe Orton]
  *) mod_auth_basic: Be less tolerant when parsing the credencial. Only spaces
     should be accepted after the authorization scheme. \t are also tolerated.
     [Christophe Jaillet]

  *) mod_socache_redis: New socache submodule provider to allow use
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