                                                         -*- coding: utf-8 -*-
Changes with Apache 2.4.63

  *) mod_dav: Update redirect-carefully example BrowserMatch config
     to match more recent client versions.  PR 66148, 67039.
     [Michal Maloszewski <michal.maloszewski canonical.com>,
      Romain Tartière <romain blogreen.org>]

  *) mod_cache_socache: Fix possible crash on error path. PR 69358.
     [Ruediger Pluem]

  *) mod_ssl: Fail cleanly at startup if OpenSSL initialization fails.
     [StephenWall]

  *) mod_md: update to version 2.4.31
     - Improved error reporting when waiting for ACME server to verify domains
       or finalizing the order fails, e.g. times out.
     - Increasing the timeouts to wait for ACME server to verify domain names
       and issue the certificate from 30 seconds to 5 minutes.
     - Change a log level from error to debug when Stapling is enabled but a
       certificate carries no OCSP responder URL.

  *) mod_proxy_balancer: Fix the handling of the stickysession configuration
     parameter by the balancer manager. PR 69510
     [Yutaka Tokunou <tokunou.yutaka@fujitsu.com>]

  *) Add the ldap-search option to mod_authnz_ldap, allowing authorization
     to be based on arbitrary expressions that do not include the username.
     Make sure that when ldap searches are too long, we explicitly log the
     error. [Graham Leggett]

  *) mod_proxy: Honor parameters of ProxyPassMatch workers with substitution
     in the host name or port. PR 69233. [Yann Ylavic]

  *) mod_log_config: Fix merging for the "LogFormat" directive.
     PR 65222. [Michael Kaufmann <mail michael-kaufmann.ch>]

  *) mod_lua: Make r.ap_auth_type writable.  PR 62497.
     [Michael Osipov <michaelo apache.org>]

  *) mod_md: update to version 2.4.29
     - Fixed HTTP-01 challenges to not carry a final newline, as some ACME
       server fail to ignore it. [Michael Kaufmann (@mkauf)]
     - Fixed missing label+newline in server-status plain text output when
       MDStapling is enabled.

  *) mod_ssl: Restore support for loading PKCS#11 keys via ENGINE
     without "SSLCryptoDevice" configured.  [Joe Orton]

  *) mod_authnz_ldap: Fix possible memory corruption if the
     AuthLDAPSubGroupAttribute directive is configured.  [Joe Orton]  

  *) mod_proxy_fcgi: Don't re-encode SCRIPT_FILENAME when set via SetHandler.
     PR 69203. [Yann Ylavic]

  *) mod_rewrite, mod_proxy: mod_proxy to canonicalize rewritten [P] URLs,
     including "unix:" ones.  PR 69235, PR 69260.  [Yann Ylavic, Ruediger Pluem]

  *) mod_rewrite: Error out in case a RewriteRule in directory context uses the
     proxy, but mod_proxy is not loaded. PR 56264.
     [Christophe Jaillet, Michael Streeter <mstreeter1@gmail.com>]

  *) http: Remove support for Request-Range header sent by Navigator 2-3 and
     MSIE 3. [Stefan Fritsch]

  *) mod_rewrite: Don't require [UNC] flag to preserve a leading //
     added by applying the perdir prefix to the substitution.
     [Ruediger Pluem, Eric Covener]

  *) Windows: Restore the ability to "Include" configuration files on UNC
     paths. PR 69313 [Eric Covener]

  *) mod_proxy: Avoid AH01059 parsing error for SetHandler "unix:" URLs
     in <Location> (incomplete fix in 2.4.62). PR 69160. [Yann Ylavic]

  *) mod_md: update to version 2.4.28
     - When the server starts, it looks for new, staged certificates to
       activate. If the staged set of files in 'md/staging/<domain>' is messed
       up, this could prevent further renewals to happen. Now, when the staging
       set is present, but could not be activated due to an error, purge the
       whole directory. [icing]
     - Fix certificate retrieval on ACME renewal to not require a 'Location:'
       header returned by the ACME CA. This was the way it was done in ACME
       before it became an IETF standard. Let's Encrypt still supports this,
       but other CAs do not. [icing]
     - Restore compatibility with OpenSSL < 1.1. [ylavic]

  *) mod_tls: removed the experimental module. It now is availble standalone
     from https://github.com/icing/mod_tls. The rustls provided API is not
     stable and does not align with the httpd release cycle.
     [Stefan Eissing]

  *) mod_rewrite: Better question mark tracking to avoid UnsafeAllow3F.
     PR 69197. [Yann Ylavic, Eric Covener]

  *) mod_http2: Return connection monitoring to the event MPM when blocking
     on client updates. [Stefan Eissing, Yann Ylavic]

Changes with Apache 2.4.62

  *) SECURITY: CVE-2024-40898: Apache HTTP Server: SSRF with
     mod_rewrite in server/vhost context on Windows (cve.mitre.org)
     SSRF in Apache HTTP Server on Windows with mod_rewrite in
     server/vhost context, allows to potentially leak NTML hashes to
     a malicious server via SSRF and malicious requests.
     Users are recommended to upgrade to version 2.4.62 which fixes
     this issue.
     Credits: Smi1e (DBAPPSecurity Ltd.)

  *) SECURITY: CVE-2024-40725: Apache HTTP Server: source code
     disclosure with handlers configured via AddType (cve.mitre.org)
     A partial fix for CVE-2024-39884 in the core of Apache HTTP
     Server 2.4.61 ignores some use of the legacy content-type based
     configuration of handlers. "AddType" and similar configuration,
     under some circumstances where files are requested indirectly,
     result in source code disclosure of local content. For example,
     PHP scripts may be served instead of interpreted.
     Users are recommended to upgrade to version 2.4.62, which fixes
     this issue.

  *) mod_proxy: Fix canonicalisation and FCGI env (PATH_INFO, SCRIPT_NAME) for
     "balancer:" URLs set via SetHandler, also allowing for "unix:" sockets
     with BalancerMember(s).  PR 69168.  [Yann Ylavic]

  *) mod_proxy: Avoid AH01059 parsing error for SetHandler "unix:" URLs.
     PR 69160 [Yann Ylavic]

  *) mod_ssl: Fix crashes in PKCS#11 ENGINE support with OpenSSL 3.2.
     [Joe Orton]

  *) mod_ssl: Add support for loading certs/keys from pkcs11: URIs
     via OpenSSL 3.x providers.  [Ingo Franzki <ifranzki linux.ibm.com>]

  *) mod_ssl: Restore SSL dumping on trace7 loglevel with OpenSSL >= 3.0.
     [Ruediger Pluem, Yann Ylavic]

  *) mpm_worker: Fix possible warning (AH00045) about children processes not
     terminating timely.  [Yann Ylavic]

Changes with Apache 2.4.61

  *) SECURITY: CVE-2024-39884: Apache HTTP Server: source code
     disclosure with handlers configured via AddType (cve.mitre.org)
     A regression in the core of Apache HTTP Server 2.4.60 ignores
     some use of the legacy content-type based configuration of
     handlers.   "AddType" and similar configuration, under some
     circumstances where files are requested indirectly, result in
     source code disclosure of local content. For example, PHP
     scripts may be served instead of interpreted.
     Users are recommended to upgrade to version 2.4.61, which fixes
     this issue.

Changes with Apache 2.4.60

  *) SECURITY: CVE-2024-39573: Apache HTTP Server: mod_rewrite proxy
     handler substitution (cve.mitre.org)
     Potential SSRF in mod_rewrite in Apache HTTP Server 2.4.59 and
     earlier allows an attacker to cause unsafe RewriteRules to
     unexpectedly setup URL's to be handled by mod_proxy.
     Credits: Orange Tsai (@orange_8361) from DEVCORE

  *) SECURITY: CVE-2024-38477: Apache HTTP Server: Crash resulting in
     Denial of Service in mod_proxy via a malicious request
     (cve.mitre.org)
     null pointer dereference in mod_proxy in Apache HTTP Server
     2.4.59 and earlier allows an attacker to crash the server via a
     malicious request.
     Credits: Orange Tsai (@orange_8361) from DEVCORE

  *) SECURITY: CVE-2024-38476: Apache HTTP Server may use
     exploitable/malicious backend application output to run local
     handlers via internal redirect (cve.mitre.org)
     Vulnerability in core of Apache HTTP Server 2.4.59 and earlier
     are vulnerably to information disclosure, SSRF or local script
     execution via backend applications whose response headers are
     malicious or exploitable.

     Note: Some legacy uses of the 'AddType' directive to connect a
     request to a handler must be ported to 'AddHandler' after this fix.

     Credits: Orange Tsai (@orange_8361) from DEVCORE

  *) SECURITY: CVE-2024-38475: Apache HTTP Server weakness in
     mod_rewrite when first segment of substitution matches
     filesystem path. (cve.mitre.org)
     Improper escaping of output in mod_rewrite in Apache HTTP Server
     2.4.59 and earlier allows an attacker to map URLs to filesystem
     locations that are permitted to be served by the server but are
     not intentionally/directly reachable by any URL, resulting in
     code execution or source code disclosure.
     Substitutions in server context that use a backreferences or
     variables as the first segment of the substitution are affected.
     Some unsafe RewiteRules will be broken by this change and the
     rewrite flag "UnsafePrefixStat" can be used to opt back in once
     ensuring the substitution is appropriately constrained.
     Credits: Orange Tsai (@orange_8361) from DEVCORE

  *) SECURITY: CVE-2024-38474: Apache HTTP Server weakness with
     encoded question marks in backreferences (cve.mitre.org)
     Substitution encoding issue in mod_rewrite in Apache HTTP Server
     2.4.59 and earlier allows attacker to execute scripts in
     directories permitted by the configuration but not directly
     reachable by any URL or source disclosure of scripts meant to
     only to be executed as CGI.

     Note: Some RewriteRules that capture and substitute unsafely will now
     fail unless rewrite flag "UnsafeAllow3F" is specified.

     Credits: Orange Tsai (@orange_8361) from DEVCORE

  *) SECURITY: CVE-2024-38473: Apache HTTP Server proxy encoding
     problem (cve.mitre.org)
     Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and
     earlier allows request URLs with incorrect encoding to be sent
     to backend services, potentially bypassing authentication via
     crafted requests.
     Credits: Orange Tsai (@orange_8361) from DEVCORE

  *) SECURITY: CVE-2024-38472: Apache HTTP Server on Windows UNC SSRF
     (cve.mitre.org)
     SSRF in Apache HTTP Server on Windows allows to potentially leak
     NTML hashes to a malicious server via SSRF and malicious
     requests or content

     Note: Existing configurations that access UNC paths
     will have to configure new directive "UNCList" to allow access
     during request processing.

     Credits: Orange Tsai (@orange_8361) from DEVCORE

  *) SECURITY: CVE-2024-36387: Apache HTTP Server: DoS by Null
     pointer in websocket over HTTP/2 (cve.mitre.org)
     Serving WebSocket protocol upgrades over a HTTP/2 connection
     could result in a Null Pointer dereference, leading to a crash
     of the server process, degrading performance.
     Credits: Marc Stern (<marc.stern AT approach-cyber.com>)

  *) mod_proxy: Fix DNS requests and connections closed before the
     configured addressTTL.  PR 69126.  [Yann Ylavic]

  *) core: On Linux, log the real thread ID in error logs.  [Joe Orton]

  *) core: Support zone/scope in IPv6 link-local addresses in Listen and
     VirtualHost directives (requires APR 1.7.x or later).  PR 59396
     [Joe Orton]

  *) mod_ssl: Reject client-initiated renegotiation with a TLS alert
     (rather than connection closure).  [Joe Orton, Yann Ylavic]

  *) Updated mime.types.  [Mohamed Akram <mohd.akram outlook.com>,
     Adam Silverstein <adamsilverstein earthboundhosting.com>]

  *) mod_ssl: Fix a regression that causes the default DH parameters for a key
     no longer set and thus effectively disabling DH ciphers when no explicit
     DH parameters are set. PR 68863 [Ruediger Pluem]

  *) mod_cgid: Optional support for file descriptor passing, fixing
     error log handling (configure --enable-cgid-fdpassing) on Unix
     platforms. PR 54221.  [Joe Orton]

  *) mod_cgid/mod_cgi: Distinguish script stderr output clearly in
     error logs.  PR 61980.  [Hank Ibell <hwibell gmail.com>]

  *) mod_tls: update version of rustls-ffi to v0.13.0.
     [Daniel McCarney (@cpu}]

  *) mod_md:
     - Using OCSP stapling information to trigger certificate renewals. Proposed
       by @frasertweedale.
     - Added directive `MDCheckInterval` to control how often the server checks
       for detected revocations. Added proposals for configurations in the
       README.md chapter "Revocations".
     - OCSP stapling: accept OCSP responses without a `nextUpdate` entry which is
       allowed in RFC 6960. Treat those as having an update interval of 12 hours.
       Added by @frasertweedale.
     - Adapt OpenSSL usage to changes in their API. By Yann Ylavic.

Changes with Apache 2.4.59

  *) SECURITY: CVE-2024-27316: Apache HTTP Server: HTTP/2 DoS by
     memory exhaustion on endless continuation frames (cve.mitre.org)
     HTTP/2 incoming headers exceeding the limit are temporarily
     buffered in nghttp2 in order to generate an informative HTTP 413
     response. If a client does not stop sending headers, this leads
     to memory exhaustion.
     Credits: Bartek Nowotarski (https://nowotarski.info/)

  *) SECURITY: CVE-2024-24795: Apache HTTP Server: HTTP Response
     Splitting in multiple modules (cve.mitre.org)
     HTTP Response splitting in multiple modules in Apache HTTP
     Server allows an attacker that can inject malicious response
     headers into backend applications to cause an HTTP
     desynchronization attack.

     After this change, CGI-like scripts cannot set Transfer-Encoding
     or Content-Length headers.  To restore the ability to set Content-Length
     header, set per-request environment variable 'ap_trust_cgilike_cl' to any
     non-empty value.

     Credits: Keran Mu, Tsinghua University and Zhongguancun
     Laboratory.

  *) SECURITY: CVE-2023-38709: Apache HTTP Server: HTTP response
     splitting (cve.mitre.org)
     Faulty input validation in the core of Apache allows malicious
     or exploitable backend/content generators to split HTTP
     responses.
     This issue affects Apache HTTP Server: through 2.4.58.
     Credits: Orange Tsai (@orange_8361) from DEVCORE

  *) mod_deflate: Fixes and better logging for handling various
     error and edge cases. [Eric Covener, Yann Ylavic, Joe Orton,
     Eric Norris <enorris etsy.com>]

  *) Add CGIScriptTimeout to mod_cgi. [Eric Covener]

  *) mod_xml2enc: Tolerate libxml2 2.12.0 and later.  PR 68610
     [ttachi <tachihara AT hotmail.com>]

  *) mod_slotmem_shm: Use ap_os_is_path_absolute() to make it portable.
     [Jean-Frederic Clere]

  *) mod_ssl: Use OpenSSL-standard functions to assemble CA
     name lists for SSLCACertificatePath/SSLCADNRequestPath.
     Names will now be consistently sorted. PR 61574.
     [Joe Orton]

  *) mod_xml2enc: Update check to accept any text/ media type
     or any XML media type per RFC 7303, avoiding
     corruption of Microsoft OOXML formats.  PR 64339.
     [Joseph Heenan <joseph.heenan fintechlabs.io>, Joe Orton]

  *) mod_http2: v2.0.26 with the following fixes:
     - Fixed `Date` header on requests upgraded from HTTP/1.1 (h2c). Fixes
       <https://github.com/icing/mod_h2/issues/272>.
     - Fixed small memory leak in h2 header bucket free. Thanks to
       Michael Kaufmann for finding this and providing the fix.

  *) htcacheclean: In -a/-A mode, list all files per subdirectory
     rather than only one. PR 65091.
     [Artem Egorenkov <aegorenkov.91 gmail.com>]

  *) mod_ssl: SSLProxyMachineCertificateFile/Path may reference files
     which include CA certificates; those CA certs are treated as if
     configured with SSLProxyMachineCertificateChainFile.  [Joe Orton]

  *) htpasswd, htdbm, dbmmanage: Update help&docs to refer to
     "hashing", rather than "encrypting" passwords.
     [Michele Preziuso <mpreziuso kaosdynamics.com>]

  *) mod_ssl: Fix build with LibreSSL 2.0.7+. PR 64047.
     [Giovanni Bechis, Yann Ylavic]

  *) htpasswd: Add support for passwords using SHA-2.  [Joe Orton,
     Yann Ylavic]

  *) core: Allow mod_env to override system environment vars. [Joe Orton]

  *) Allow mod_dav_fs to tolerate race conditions between PROPFIND and an
     operation which removes a directory/file between apr_dir_read() and
     apr_stat(). Current behaviour is to abort the connection which seems
     inferior to tolerating (and logging) the error. [Joe Orton]

  *) mod_ldap: HTML-escape data in the ldap-status handler.
     [Eric Covener, Chamal De Silva]

  *) mod_ssl: Disable the OpenSSL ENGINE API when OPENSSL_NO_ENGINE is set.
     Allow for "SSLCryptoDevice builtin" if the ENGINE API is not available,
     notably with OpenSSL >= 3.  PR 68080.  [Yann Ylavic, Joe Orton]

  *) mod_ssl: Improve compatibility with OpenSSL 3, fix build warnings about
     deprecated ENGINE_ API, honor OPENSSL_API_COMPAT setting while defaulting
     to compatibitily with version 1.1.1 (including ENGINEs / SSLCryptoDevice).
     [Yann Ylavic]

  *) mod_ssl: release memory to the OS when needed. [Giovanni Bechis]

  *) mod_proxy: Ignore (and warn about) enablereuse=on for ProxyPassMatch when
     some dollar substitution (backreference) happens in the hostname or port
     part of the URL.  [Yann Ylavic]

  *) mod_proxy: Allow to set a TTL for how long DNS resolutions to backend
     systems are cached. [Yann Ylavic]

  *) mod_proxy: Add optional third argument for ProxyRemote, which
     configures Basic authentication credentials to pass to the remote
     proxy.  PR 37355.  [Joe Orton]

Changes with Apache 2.4.58

  *) SECURITY: CVE-2023-45802: Apache HTTP Server: HTTP/2 stream
     memory not reclaimed right away on RST (cve.mitre.org)
     When a HTTP/2 stream was reset (RST frame) by a client, there
     was a time window were the request's memory resources were not
     reclaimed immediately. Instead, de-allocation was deferred to
     connection close. A client could send new requests and resets,
     keeping the connection busy and open and causing the memory
     footprint to keep on growing. On connection close, all resources
     were reclaimed, but the process might run out of memory before
     that.
     This was found by the reporter during testing of CVE-2023-44487
     (HTTP/2 Rapid Reset Exploit) with their own test client. During
     "normal" HTTP/2 use, the probability to hit this bug is very
     low. The kept memory would not become noticeable before the
     connection closes or times out.
     Users are recommended to upgrade to version 2.4.58, which fixes
     the issue.
     Credits: Will Dormann of Vul Labs

  *) SECURITY: CVE-2023-43622: Apache HTTP Server: DoS in HTTP/2 with
     initial windows size 0 (cve.mitre.org)
     An attacker, opening a HTTP/2 connection with an initial window
     size of 0, was able to block handling of that connection
     indefinitely in Apache HTTP Server. This could be used to
     exhaust worker resources in the server, similar to the well
     known "slow loris" attack pattern.
     This has been fixed in version 2.4.58, so that such connection
     are terminated properly after the configured connection timeout.
     This issue affects Apache HTTP Server: from 2.4.55 through
     2.4.57.
     Users are recommended to upgrade to version 2.4.58, which fixes
     the issue.
     Credits: Prof. Sven Dietrich (City University of New York)

  *) SECURITY: CVE-2023-31122: mod_macro buffer over-read
     (cve.mitre.org)
     Out-of-bounds Read vulnerability in mod_macro of Apache HTTP
     Server.This issue affects Apache HTTP Server: through 2.4.57.
     Credits: David Shoon (github/davidshoon)

  *) mod_ssl: Silence info log message "SSL Library Error: error:0A000126:
     SSL routines::unexpected eof while reading" when using
     OpenSSL 3 by setting SSL_OP_IGNORE_UNEXPECTED_EOF if
     available. [Rainer Jung]

  *) mod_http2: improved early cleanup of streams.
     [Stefan Eissing]

  *) mod_proxy_http2: improved error handling on connection errors while
     response is already underway.
     [Stefan Eissing]

  *) mod_http2: fixed a bug that could lead to a crash in main connection
     output handling. This occured only when the last request on a HTTP/2
     connection had been processed and the session decided to shut down.
     This could lead to an attempt to send a final GOAWAY while the previous
     write was still in progress. See PR 66646.
     [Stefan Eissing]

  *) mod_proxy_http2: fix `X-Forward-Host` header to carry the correct value.
     Fixes PR66752.
     [Stefan Eissing]

  *) mod_http2: added support for bootstrapping WebSockets via HTTP/2, as
     described in RFC 8441. A new directive 'H2WebSockets on|off' has been
     added. The feature is by default not enabled.
     As also discussed in the manual, this feature should work for setups
     using "ProxyPass backend-url upgrade=websocket" without further changes.
     Special server modules for WebSockets will have to be adapted,
     most likely, as the handling if IO events is different with HTTP/2.
     HTTP/2 WebSockets are supported on platforms with native pipes. This
     excludes Windows.
     [Stefan Eissing]

  *) mod_rewrite: Fix a regression with both a trailing ? and [QSA].
     in OCSP stapling. PR 66672. [Frank Meier <frank.meier ergon.ch>, covener]

  *) mod_http2: fixed a bug in flushing pending data on an already closed
     connection that could lead to a busy loop, preventing the HTTP/2 session
     to close down successfully. Fixed PR 66624.
     [Stefan Eissing]

  *) mod_http2: v2.0.15 with the following fixes and improvements
     - New directive 'H2EarlyHint name value' to add headers to a response,
       picked up already when a "103 Early Hints" response is sent. 'name' and
       'value' must comply to the HTTP field restrictions.
       This directive can be repeated several times and header fields of the
       same names add. Sending a 'Link' header with 'preload' relation will
       also cause a HTTP/2 PUSH if enabled and supported by the client.
     - Fixed an issue where requests were not logged and accounted in a timely
       fashion when the connection returns to "keepalive" handling, e.g. when
       the request served was the last outstanding one.
       This led to late appearance in access logs with wrong duration times
       reported.
     - Accurately report the bytes sent for a request in the '%O' Log format.
       This addresses #203, a long outstanding issue where mod_h2 has reported
       numbers over-eagerly from internal buffering and not what has actually
       been placed on the connection.
       The numbers are now the same with and without H2CopyFiles enabled.
     [Stefan Eissing]

  *) mod_proxy_http2: fix retry handling to not leak temporary errors.
     On detecting that that an existing connection was shutdown by the other
     side, a 503 response leaked even though the request was retried on a
     fresh connection.
     [Stefan Eissing]

  *) mod_rewrite: Add server directory to include path as mod_rewrite requires
     test_char.h. PR 66571 [Valeria Petrov <valeria.petrov@spinetix.com>]

  *) mod_http2: new directive `H2ProxyRequests on|off` to enable handling
     of HTTP/2 requests in a forward proxy configuration.
     General forward proxying is enabled via `ProxyRequests`. If the
     HTTP/2 protocol is also enabled for such a server/host, this new
     directive is needed in addition.
     [Stefan Eissing]

  *) core: Updated conf/mime.types:
     - .js moved from 'application/javascript' to 'text/javascript'
     - .mjs was added as 'text/javascript'
     - add .opus ('audio/ogg')
     - add 'application/vnd.geogebra.slides'
     - add WebAssembly MIME types and extension
     [Mathias Bynens <@mathiasbynens> via PR 318,
      Richard de Boer <richard tubul.net>, Dave Hodder <dmh dmh.org.uk>,
      Zbynek Konecny <zbynek1729 gmail.com>]

  *) mod_proxy_http2: fixed using the wrong "bucket_alloc" from the backend
     connection when sending data on the frontend one. This caused crashes
     or infinite loops in rare situations.
  *) mod_proxy_http2: fixed a bug in retry/response handling that could lead
     to wrong status codes or HTTP messages send at the end of response bodies
     exceeding the announced content-length.
  *) mod_proxy_http2: fix retry handling to not leak temporary errors.
     On detecting that that an existing connection was shutdown by the other
     side, a 503 response leaked even though the request was retried on a
     fresh connection.
  *) mod_http2: fixed a bug that did cleanup of consumed and pending buckets in
     the wrong order when a bucket_beam was destroyed.
     [Stefan Eissing]

  *) mod_http2: avoid double chunked-encoding on internal redirects.
     PR 66597 [Yann Ylavic, Stefan Eissing]

  *) mod_http2: Fix reporting of `Total Accesses` in server-status to not count
     HTTP/2 requests twice. Fixes PR 66801.
     [Stefan Eissing]

  *) mod_ssl: Fix handling of Certificate Revoked messages
     in OCSP stapling. PR 66626. [<gmoniker gmail.com>]

  *) mod_http2: fixed a bug in handling of stream timeouts.
     [Stefan Eissing]

  *) mod_tls: updating to rustls-ffi version 0.9.2 or higher.
     Checking in configure for proper version installed. Code
     fixes for changed clienthello member name.
     [Stefan Eissing]

  *) mod_md:
     - New directive `MDMatchNames all|servernames` to allow more control over how
       MDomains are matched to VirtualHosts.
     - New directive `MDChallengeDns01Version`. Setting this to `2` will provide
       the command also with the challenge value on `teardown` invocation. In version
       1, the default, only the `setup` invocation gets this parameter.
       Refs #312. Thanks to @domrim for the idea.
     - For Managed Domain in "manual" mode, the checks if all used ServerName and
       ServerAlias are part of the MDomain now reports a warning instead of an error
       (AH10040) when not all names are present.
     - MDChallengeDns01 can now be configured for individual domains.
       Using PR from Jérôme Billiras (@bilhackmac) and adding test case and fixing proper working
     - Fixed a bug found by Jérôme Billiras (@bilhackmac) that caused the challenge
       teardown not being invoked as it should.

  *) mod_ldap: Avoid performance overhead of APR-util rebind cache for
     OpenLDAP 2.2+.  PR 64414.  [Joe Orton]

  *) mod_http2: new directive 'H2MaxDataFrameLen n' to limit the maximum
     amount of response body bytes put into a single HTTP/2 DATA frame.
     Setting this to 0 places no limit (but the max size allowed by the
     protocol is observed).
     The module, by default, tries to use the maximum size possible, which is
     somewhat around 16KB. This sets the maximum. When less response data is
     available, smaller frames will be sent.

  *) mod_md: fixed passing of the server environment variables to programs
     started via MDMessageCmd and MDChallengeDns01 on *nix system.
     See <https://github.com/icing/mod_md/issues/319>.
     [Stefan Eissing]

  *) mod_dav: Add DavBasePath directive to configure the repository root
     path.  PR 35077.  [Joe Orton]

  *) mod_alias: Add AliasPreservePath directive to map the full
     path after the alias in a location. [Graham Leggett]

  *) mod_alias: Add RedirectRelative to allow relative redirect targets to be
     issued as-is. [Eric Covener, Graham Leggett]

  *) core: Add formats %{z} and %{strftime-format} to ErrorLogFormat, and make
     sure that if the format is configured early enough it applies to every log
     line.  PR 62161.  [Yann Ylavic]

  *) mod_deflate: Add DeflateAlterETag to control how the ETag
     is modified. The 'NoChange' parameter mimics 2.2.x behavior.
     PR 45023, PR 39727. [Eric Covener]

  *) core: Optimize send_brigade_nonblocking(). [Yann Ylavic, Christophe Jaillet]

  *) mod_status: Remove duplicate keys "BusyWorkers" and "IdleWorkers".
     Resolve inconsistency between the previous two occurrences by
     counting workers in state SERVER_GRACEFUL no longer as busy,
     but instead in a new counter "GracefulWorkers" (or on HTML
     view as "workers gracefully restarting"). Also add the graceful
     counter as a new column to the existing HTML per process table
     for async MPMs. PR 63300. [Rainer Jung]

Changes with Apache 2.4.57

  *) mod_proxy: Check before forwarding that a nocanon path has not been
     rewritten with spaces during processing.  [Yann Ylavic]

  *) mod_proxy: In case that AllowEncodedSlashes is set to NoDecode do not
     double encode encoded slashes in the URL sent by the reverse proxy to the
     backend. [Ruediger Pluem]

  *) mod_http2: fixed a crash during connection termination. See PR 66539.
     [Stefan Eissing]

  *) mod_rewrite: Fix a 2.4.56 regression for substitutions ending
     in a question mark. PR66547. [Eric Covener]

  *) mod_rewrite: Add "BCTLS" and "BNE" RewriteRule flags. Re-allow encoded
     characters on redirections without the "NE" flag. 
     [Yann Ylavic, Eric Covener]

  *) mod_proxy: Fix double encoding of the uri-path of the request forwarded
     to the origin server, when using mapping=encoded|servlet.  [Yann Ylavic]

  *) mod_mime: Do not match the extention against possible query string
     parameters in case ProxyPass was used with the nocanon option.
     [Ruediger Pluem]

Changes with Apache 2.4.56

  *) SECURITY: CVE-2023-27522: Apache HTTP Server: mod_proxy_uwsgi
     HTTP response splitting (cve.mitre.org)
     HTTP Response Smuggling vulnerability in Apache HTTP Server via
     mod_proxy_uwsgi. This issue affects Apache HTTP Server: from
     2.4.30 through 2.4.55.
     Special characters in the origin response header can
     truncate/split the response forwarded to the client.
     Credits: Dimas Fariski Setyawan Putra (nyxsorcerer)

  *) SECURITY: CVE-2023-25690: HTTP request splitting with
     mod_rewrite and mod_proxy (cve.mitre.org)
     Some mod_proxy configurations on Apache HTTP Server versions
     2.4.0 through 2.4.55 allow a HTTP Request Smuggling attack.
     Configurations are affected when mod_proxy is enabled along with
     some form of RewriteRule or ProxyPassMatch in which a non-specific
     pattern matches some portion of the user-supplied request-target (URL)
     data and is then re-inserted into the proxied request-target
     using variable substitution. For example, something like:
        RewriteEngine on
        RewriteRule "^/here/(.*)" "http://example.com:8080/elsewhere?$1"; [P]
        ProxyPassReverse /here/  http://example.com:8080/
     Request splitting/smuggling could result in bypass of access
     controls in the proxy server, proxying unintended URLs to
     existing origin servers, and cache poisoning.
     Credits: Lars Krapf of Adobe

  *) rotatelogs: Add -T flag to allow subsequent rotated logfiles to be
     truncated without the initial logfile being truncated.  [Eric Covener]

  *) mod_ldap: LDAPConnectionPoolTTL should accept negative values in order to
     allow connections of any age to be reused. Up to now, a negative value
     was handled as an error when parsing the configuration file.  PR 66421.
     [nailyk <bzapache nailyk.fr>, Christophe Jaillet]

  *) mod_proxy_ajp: Report an error if the AJP backend sends an invalid number
     of headers. [Ruediger Pluem]

  *) mod_md:
     - Enabling ED25519 support and certificate transparency information when
       building with libressl v3.5.0 and newer. Thanks to Giovanni Bechis.
     - MDChallengeDns01 can now be configured for individual domains.
       Thanks to Jérôme Billiras (@bilhackmac) for the initial PR.
     - Fixed a bug found by Jérôme Billiras (@bilhackmac) that caused the challenge
       teardown not being invoked as it should.
     [Stefan Eissing]

  *) mod_http2: client resets of HTTP/2 streams led to unwanted 500 errors
     reported in access logs and error documents. The processing of the
     reset was correct, only unneccesary reporting was caused.
     [Stefan Eissing]

  *) mod_proxy_uwsgi: Stricter backend HTTP response parsing/validation.
     [Yann Ylavic]

Changes with Apache 2.4.55

  *) SECURITY: CVE-2022-37436: Apache HTTP Server: mod_proxy prior to
     2.4.55 allows a backend to trigger HTTP response splitting
     (cve.mitre.org)
     Prior to Apache HTTP Server 2.4.55, a malicious backend can
     cause the response headers to be truncated early, resulting in
     some headers being incorporated into the response body. If the
     later headers have any security purpose, they will not be
     interpreted by the client.
     Credits: Dimas Fariski Setyawan Putra (@nyxsorcerer)

  *) SECURITY: CVE-2022-36760: Apache HTTP Server: mod_proxy_ajp
     Possible request smuggling (cve.mitre.org)
     Inconsistent Interpretation of HTTP Requests ('HTTP Request
     Smuggling') vulnerability in mod_proxy_ajp of Apache HTTP Server
     allows an attacker to smuggle requests to the AJP server it
     forwards requests to.  This issue affects Apache HTTP Server
     Apache HTTP Server 2.4 version 2.4.54 and prior versions.
     Credits: ZeddYu_Lu from Qi'anxin Research Institute of Legendsec
     at Qi'anxin Group

  *) SECURITY: CVE-2006-20001: mod_dav out of  bounds read, or write
     of zero byte (cve.mitre.org)
     A carefully crafted If: request header can cause a memory read,
     or write of a single zero byte, in a pool (heap) memory location
     beyond the header value sent. This could cause the process to
     crash.
     This issue affects Apache HTTP Server 2.4.54 and earlier.

  *) mod_dav: Open the lock database read-only when possible.
     PR 36636 [Wilson Felipe <wfelipe gmail.com>, manu]

  *) mod_proxy_http2: apply the standard httpd content type handling
     to responses from the backend, as other proxy modules do. Fixes PR 66391.
     Thanks to Jérôme Billiras for providing the patch.
     [Stefan Eissing]

  *) mod_dav: mod_dav overrides dav_fs response on PUT failure. PR 35981
     [Basant Kumar Kukreja <basant.kukreja sun.com>, Alejandro Alvarez
     <alejandro.alvarez.ayllon cern.ch>]

  *) mod_proxy_hcheck: Honor worker timeout settings.  [Yann Ylavic]

  *) mod_http2: version 2.0.11 of the module, synchronizing changes
     with the gitgub version. This is a partial rewrite of how connections
     and streams are handled.
     - an APR pollset and pipes (where supported) are used to monitor
       the main connection and react to IO for request/response handling.
       This replaces the stuttered timed waits of earlier versions.
     - H2SerializeHeaders directive still exists, but has no longer an effect.
     - Clients that seemingly misbehave still get less resources allocated,
       but ongoing requests are no longer disrupted.
     - Fixed an issue since 1.15.24 that "Server" headers in proxied requests
       were overwritten instead of preserved. [PR by @daum3ns]
     - A regression in v1.15.24 was fixed that could lead to httpd child
       processes not being terminated on a graceful reload or when reaching
       MaxConnectionsPerChild. When unprocessed h2 requests were queued at
       the time, these could stall. See #212.
     - Improved information displayed in 'server-status' for H2 connections when
       Extended Status is enabled. Now one can see the last request that IO
       operations happened on and transferred IO stats are updated as well.
     - When reaching server limits, such as MaxRequestsPerChild, the HTTP/2 connection
       send a GOAWAY frame much too early on new connections, leading to invalid
       protocol state and a client failing the request. See PR65731 at
       <https://bz.apache.org/bugzilla/show_bug.cgi?id=65731>.
       The module now initializes the HTTP/2 protocol correctly and allows the
       client to submit one request before the shutdown via a GOAWAY frame
       is being announced.
     - :scheme pseudo-header values, not matching the
       connection scheme, are forwarded via absolute uris to the
       http protocol processing to preserve semantics of the request.
       Checks on combinations of pseudo-headers values/absence
       have been added as described in RFC 7540. Fixes #230.
     - A bug that prevented trailers (e.g. HEADER frame at the end) to be
       generated in certain cases was fixed. See #233 where it prevented
       gRPC responses to be properly generated.
     - Request and response header values are automatically stripped of leading
       and trialing space/tab characters. This is equivalent behaviour to what
       Apache httpd's http/1.1 parser does.
       The checks for this in nghttp2 v1.50.0+ are disabled.
     - Extensive testing in production done by Alessandro Bianchi (@alexskynet)
       on the v2.0.x versions for stability. Many thanks!

  *) mod_proxy_http2: fixed #235 by no longer forwarding 'Host:' header when
     request ':authority' is known. Improved test case that did not catch that
     the previous 'fix' was incorrect.

  *) mod_proxy_hcheck: hcmethod now allows for HTTP/1.1 requests
     using GET11, HEAD11 and/or OPTIONS11. [Jim Jagielski]

  *) mod_proxy: The AH03408 warning for a forcibly closed backend
     connection is now logged at INFO level.  [Yann Ylavic]

  *) mod_ssl: When dumping the configuration, the existence of
     certificate/key files is no longer tested.  [Joe Orton]

  *) mod_authn_core: Add expression support to AuthName and AuthType.
     [Graham Leggett]

  *) mod_ssl: when a proxy connection had handled a request using SSL, an
     error was logged when "SSLProxyEngine" was only configured in the
     location/proxy section and not the overall server. The connection
     continued to work, the error log was in error. Fixed PR66190.
     [Stefan Eissing]

  *) mod_proxy_hcheck: Re-enable workers in standard ERROR state. PR 66302.
     [Alessandro Cavaliere <alessandro.cavalier7 unibo.it>]

  *) mod_proxy_hcheck: Detect AJP/CPING support correctly. PR 66300.
     [Alessandro Cavaliere <alessandro.cavalier7 unibo.it>]

  *) mod_http2: Export mod_http2.h as public header. [Stefan Eissing]

  *) mod_md: a new directive `MDStoreLocks` can be used on cluster
     setups with a shared file system for `MDStoreDir` to order
     activation of renewed certificates when several cluster nodes are
     restarted at the same time. Store locks are not enabled by default.
     Restored curl_easy cleanup behaviour from v2.4.14 and refactored
     the use of curl_multi for OCSP requests to work with that.
     Fixes <https://github.com/icing/mod_md/issues/293>.

  *) core: Avoid an overflow on large inputs in ap_is_matchexp.  PR 66033
     [Ruediger Pluem]

  *) mod_heartmonitor: Allow "HeartbeatMaxServers 0" to use file based
     storage instead of slotmem. Needed after setting
     HeartbeatMaxServers default to the documented value 10 in 2.4.54.
     PR 66131.  [Jérôme Billiras]

  *) mod_dav: DAVlockDiscovery option to disable WebDAV lock discovery
     This is a game changer for performances if client use PROPFIND a lot,
     PR 66313. [Emmanuel Dreyfus]

Changes with Apache 2.4.54

  *) SECURITY: CVE-2022-31813: mod_proxy X-Forwarded-For dropped by
     hop-by-hop mechanism (cve.mitre.org)
     Apache HTTP Server 2.4.53 and earlier may not send the
     X-Forwarded-* headers to the origin server based on client side
     Connection header hop-by-hop mechanism.
     This may be used to bypass IP based authentication on the origin
     server/application.
     Credits: The Apache HTTP Server project would like to thank
     Gaetan Ferry (Synacktiv) for reporting this issue

  *) SECURITY: CVE-2022-30556: Information Disclosure in mod_lua with
     websockets (cve.mitre.org)
     Apache HTTP Server 2.4.53 and earlier may return lengths to
     applications calling r:wsread() that point past the end of the
     storage allocated for the buffer.
     Credits: The Apache HTTP Server project would like to thank
     Ronald Crane (Zippenhop LLC) for reporting this issue

  *) SECURITY: CVE-2022-30522: mod_sed denial of service
     (cve.mitre.org)
     If Apache HTTP Server 2.4.53 is configured to do transformations
     with mod_sed in contexts where the input to mod_sed may be very
     large, mod_sed may make excessively large memory allocations and
     trigger an abort.
     Credits: This issue was found by Brian Moussalli from the JFrog
     Security Research team

  *) SECURITY: CVE-2022-29404: Denial of service in mod_lua
     r:parsebody (cve.mitre.org)
     In Apache HTTP Server 2.4.53 and earlier, a malicious request to
     a lua script that calls r:parsebody(0) may cause a denial of
     service due to no default limit on possible input size.
     Credits: The Apache HTTP Server project would like to thank
     Ronald Crane (Zippenhop LLC) for reporting this issue

  *) SECURITY: CVE-2022-28615: Read beyond bounds in
     ap_strcmp_match() (cve.mitre.org)
     Apache HTTP Server 2.4.53 and earlier may crash or disclose
     information due to a read beyond bounds in ap_strcmp_match()
     when provided with an extremely large input buffer.  While no
     code distributed with the server can be coerced into such a
     call, third-party modules or lua scripts that use
     ap_strcmp_match() may hypothetically be affected.
     Credits: The Apache HTTP Server project would like to thank
     Ronald Crane (Zippenhop LLC) for reporting this issue

  *) SECURITY: CVE-2022-28614: read beyond bounds via ap_rwrite()
     (cve.mitre.org)
     The ap_rwrite() function in Apache HTTP Server 2.4.53 and
     earlier may read unintended memory if an attacker can cause the
     server to reflect very large input using ap_rwrite() or
     ap_rputs(), such as with mod_luas r:puts() function.
     Credits: The Apache HTTP Server project would like to thank
     Ronald Crane (Zippenhop LLC) for reporting this issue

  *) SECURITY: CVE-2022-28330: read beyond bounds in mod_isapi
     (cve.mitre.org)
     Apache HTTP Server 2.4.53 and earlier on Windows may read beyond
     bounds when configured to process requests with the mod_isapi
     module.
     Credits: The Apache HTTP Server project would like to thank
     Ronald Crane (Zippenhop LLC) for reporting this issue

  *) SECURITY: CVE-2022-26377: mod_proxy_ajp: Possible request
     smuggling (cve.mitre.org)
     Inconsistent Interpretation of HTTP Requests ('HTTP Request
     Smuggling') vulnerability in mod_proxy_ajp of Apache HTTP Server
     allows an attacker to smuggle requests to the AJP server it
     forwards requests to.  This issue affects Apache HTTP Server
     Apache HTTP Server 2.4 version 2.4.53 and prior versions.
     Credits: Ricter Z @ 360 Noah Lab

  *) mod_ssl: SSLFIPS compatible with OpenSSL 3.0.  PR 66063.
     [Petr Sumbera <petr.sumbera oracle.com>, Yann Ylavic]

  *) mod_proxy_http: Avoid 417 responses for non forwardable 100-continue.
     PR 65666.  [Yann Ylavic]

  *) mod_md:  a bug was fixed that caused very large MDomains
     with the combined DNS names exceeding ~7k to fail, as
     request bodies would contain partially wrong data from
     uninitialized memory. This would have appeared as failure
     in signing-up/renewing such configurations.
     [Stefan Eissing, Ronald Crane (Zippenhop LLC)]

  *) mod_proxy_http: Avoid 417 responses for non forwardable 100-continue.
     PR 65666.  [Yann Ylavic]

  *) MPM event: Restart children processes killed before idle maintenance.
     PR 65769.  [Yann Ylavic, Ruediger Pluem]

  *) ab: Allow for TLSv1.3 when the SSL library supports it.
     [abhilash1232 gmail.com, xiaolongx.jiang intel.com, Yann Ylavic]

  *) core: Disable TCP_NOPUSH optimization on OSX since it might introduce
     transmission delays.  PR 66019.  [Yann Ylavic]

  *) MPM event: Fix accounting of active/total processes on ungraceful restart,
     PR 66004 (follow up to PR 65626 from 2.4.52).  [Yann Ylavic]

  *) core: make ap_escape_quotes() work correctly on strings
     with more than MAX_INT/2 characters, counting quotes double.
     Credit to <generalbugs@zippenhop.com> for finding this.
     [Stefan Eissing]

  *) mod_md: the `MDCertificateAuthority` directive can take more than one URL/name of
     an ACME CA. This gives a failover for renewals when several consecutive attempts
     to get a certificate failed.
     A new directive was added: `MDRetryDelay` sets the delay of retries.
     A new directive was added: `MDRetryFailover` sets the number of errored
     attempts before an alternate CA is selected for certificate renewals.
     [Stefan Eissing]

  *) mod_http2: remove unused and insecure code. Fixes PR66037.
     Thanks to Ronald Crane (Zippenhop LLC) for reporting this.
     [Stefan Eissing]

  *) mod_proxy: Add backend port to log messages to
     ease identification of involved service.  [Rainer Jung]

  *) mod_http2: removing unscheduling of ongoing tasks when
     connection shows potential abuse by a client. This proved
     counter-productive and the abuse detection can false flag
     requests using server-side-events.
     Fixes <https://github.com/icing/mod_h2/issues/231>.
     [Stefan Eissing]

  *) mod_md: Implement full auto status ("key: value" type status output).
     Especially not only status summary counts for certificates and
     OCSP stapling but also lists. Auto status format is similar to
     what was used for mod_proxy_balancer.
     [Rainer Jung]

  *) mod_md: fixed a bug leading to failed transfers for OCSP
     stapling information when more than 6 certificates needed
     updates in the same run.  [Stefan Eissing]

  *) mod_proxy: Set a status code of 502 in case the backend just closed the
     connection in reply to our forwarded request.  [Ruediger Pluem]

  *) mod_md: a possible NULL pointer deref was fixed in
     the JSON code for persisting time periods (start+end).
     Fixes #282 on mod_md's github.
     Thanks to @marcstern for finding this.  [Stefan Eissing]

  *) mod_heartmonitor: Set the documented default value
     "10" for HeartbeatMaxServers instead of "0". With "0"
     no shared memory slotmem was initialized.  [Rainer Jung]

  *) mod_md: added support for managing certificates via a
     local tailscale daemon for users of that secure networking.
     This gives trusted certificates for tailscale assigned
     domain names in the *.ts.net space.
     [Stefan Eissing]

  *) core: Change default value of LimitRequestBody from 0 (unlimited)
     to 1GB. [Eric Covener]

Changes with Apache 2.4.53

  *) SECURITY: CVE-2022-23943: mod_sed: Read/write beyond bounds
     (cve.mitre.org)
     Out-of-bounds Write vulnerability in mod_sed of Apache HTTP
     Server allows an attacker to overwrite heap memory with possibly
     attacker provided data.
     This issue affects Apache HTTP Server 2.4 version 2.4.52 and
     prior versions.
     Credits: Ronald Crane (Zippenhop LLC)

  *) SECURITY: CVE-2022-22721: core: Possible buffer overflow with
     very large or unlimited LimitXMLRequestBody (cve.mitre.org)
     If LimitXMLRequestBody is set to allow request bodies larger
     than 350MB (defaults to 1M) on 32 bit systems an integer
     overflow happens which later causes out of bounds writes.
     This issue affects Apache HTTP Server 2.4.52 and earlier.
     Credits: Anonymous working with Trend Micro Zero Day Initiative

  *) SECURITY: CVE-2022-22720: HTTP request smuggling vulnerability
     in Apache HTTP Server 2.4.52 and earlier (cve.mitre.org)
     Apache HTTP Server 2.4.52 and earlier fails to close inbound
     connection when errors are encountered discarding the request
     body, exposing the server to HTTP Request Smuggling
     Credits: James Kettle <james.kettle portswigger.net>

  *) SECURITY: CVE-2022-22719: mod_lua Use of uninitialized value of
     in r:parsebody (cve.mitre.org)
     A carefully crafted request body can cause a read to a random
     memory area which could cause the process to crash.
     This issue affects Apache HTTP Server 2.4.52 and earlier.
     Credits: Chamal De Silva

  *) core: Make sure and check that LimitXMLRequestBody fits in system memory.
     [Ruediger Pluem, Yann Ylavic]

  *) core: Simpler connection close logic if discarding the request body fails.
     [Yann Ylavic, Ruediger Pluem]

  *) mod_http2: preserve the port number given in a HTTP/1.1
     request that was Upgraded to HTTP/2. Fixes PR65881.
     [Stefan Eissing]

  *) mod_proxy: Allow for larger worker name.  PR 53218.  [Yann Ylavic]

  *) dbm: Split the loading of a dbm driver from the opening of a dbm file. When
     an attempt to load a dbm driver fails, log clearly which driver triggered
     the error (not "default"), and what the error was. [Graham Leggett]

  *) mod_proxy: Use the maxium of front end and backend timeouts instead of the
     minimum when tunneling requests (websockets, CONNECT requests).
     Backend timeouts can be configured more selectively (per worker if needed)
     as front end timeouts and typically the backend timeouts reflect the
     application requirements better.  PR 65886 [Ruediger Pluem]

  *) ap_regex: Use Thread Local Storage (TLS) to recycle ap_regexec() buffers
     when an efficient TLS implementation is available. [Yann Ylavic]

  *) core, mod_info: Add compiled and loaded PCRE versions to version
     number display.  [Rainer Jung]

  *) mod_md: do not interfere with requests to /.well-known/acme-challenge/
     resources if challenge type 'http-01' is not configured for a domain.
     Fixes <https://github.com/icing/mod_md/issues/279>.
     [Stefan Eissing]

  *) mod_dav: Fix regression when gathering properties which could lead to huge
     memory consumption proportional to the number of resources.
     [Evgeny Kotkov, Ruediger Pluem]

  *) Support pcre2 (10.x) library in place of the now end-of-life pcre (8.x)
     for regular expression evaluation. This depends on locating pcre2-config.
     [William Rowe, Petr Pisar <ppisar redhat.com>, Rainer Jung]

  *) Add the ldap function to the expression API, allowing LDAP filters and
     distinguished names based on expressions to be escaped correctly to
     guard against LDAP injection. [Graham Leggett]

  *) mod_md: the status description in MDomain's JSON, exposed in the
     md-status handler (if configured) did sometimes not carry the correct
     message when certificates needed renew.
     [Stefan Eissing]

  *) mpm_event: Fix a possible listener deadlock on heavy load when restarting
     and/or reaching MaxConnectionsPerChild.  PR 65769.  [Yann Ylavic]

Changes with Apache 2.4.52

  *) SECURITY: CVE-2021-44790: Possible buffer overflow when parsing
     multipart content in mod_lua of Apache HTTP Server 2.4.51 and
     earlier (cve.mitre.org)
     A carefully crafted request body can cause a buffer overflow in
     the mod_lua multipart parser (r:parsebody() called from Lua
     scripts).
     The Apache httpd team is not aware of an exploit for the
     vulnerability though it might be possible to craft one.
     This issue affects Apache HTTP Server 2.4.51 and earlier.
     Credits: Chamal

  *) SECURITY: CVE-2021-44224: Possible NULL dereference or SSRF in
     forward proxy configurations in Apache HTTP Server 2.4.51 and
     earlier (cve.mitre.org)
     A crafted URI sent to httpd configured as a forward proxy
     (ProxyRequests on) can cause a crash (NULL pointer dereference)
     or, for configurations mixing forward and reverse proxy
     declarations, can allow for requests to be directed to a
     declared Unix Domain Socket endpoint (Server Side Request
     Forgery).
     This issue affects Apache HTTP Server 2.4.7 up to 2.4.51
     (included).
     Credits: 漂亮鼠
     TengMA(@Te3t123)

  *) http: Enforce that fully qualified uri-paths not to be forward-proxied
     have an http(s) scheme, and that the ones to be forward proxied have a
     hostname, per HTTP specifications.  [Ruediger Pluem, Yann Ylavic]

  *) configure: OpenSSL detection will now use pkg-config data from
     .../lib64/ within the --with-ssl path. [Jean-Frederic Clere]

  *) mod_proxy_connect, mod_proxy: Do not change the status code after we
     already sent it to the client. [Ruediger Pluem]

  *) mod_http: Correctly sent a 100 Continue status code when sending an interim
     response as result of an Expect: 100-Continue in the request and not the
     current status code of the request. PR 65725 [Ruediger Pluem]

  *) mod_dav: Some DAV extensions, like CalDAV, specify both document
     elements and property elements that need to be taken into account
     when generating a property. The document element and property element
     are made available in the dav_liveprop_elem structure by calling
     dav_get_liveprop_element(). [Graham Leggett]

  *) mod_dav: Add utility functions dav_validate_root_ns(),
     dav_find_child_ns(), dav_find_next_ns(), dav_find_attr_ns() and
     dav_find_attr() so that other modules get to play too.
     [Graham Leggett]

  *) mpm_event: Restart stopping of idle children after a load peak. PR 65626.
     [Yann Ylavic, Ruediger Pluem]

  *) mod_http2: fixes 2 regressions in server limit handling.
     1. When reaching server limits, such as MaxRequestsPerChild, the
        HTTP/2 connection send a GOAWAY frame much too early on new
        connections, leading to invalid protocol state and a client
        failing the request. See PR65731.
        The module now initializes the HTTP/2 protocol correctly and
        allows the client to submit one request before the shutdown
        via a GOAWAY frame is being announced.
     2. A regression in v1.15.24 was fixed that could lead to httpd
        child processes not being terminated on a graceful reload or
        when reaching MaxConnectionsPerChild. When unprocessed h2
        requests were queued at the time, these could stall.
        See <https://github.com/icing/mod_h2/issues/212>.
     [Stefan Eissing]

  *) mod_ssl: Add build support for OpenSSL v3. [Rainer Jung,
     Stefan Fritsch, Yann Ylavic, Stefan Eissing, Joe Orton,
     Giovanni Bechis]

  *) mod_proxy_connect: Honor the smallest of the backend or client timeout
     while tunneling.  [Yann Ylavic]

  *) mod_proxy: SetEnv proxy-nohalfclose (or alike) allows to disable TCP
     half-close forwarding when tunneling protocols.  [Yann Ylavic]

  *) core: Be safe with ap_lingering_close() called with a socket NULL-ed by
     a third-party module.  PR 65627.
     [acmondor <bz.apache.org acmondor.ca>, Yann Ylavic]

  *) mod_md: Fix memory leak in case of failures to load the private key.
     PR 65620 [ Filipe Casal <filipe.casal@trailofbits.com> ]

  *) mod_md: adding v2.4.8 with the following changes
    - Added support for ACME External Account Binding (EAB).
      Use the new directive `MDExternalAccountBinding` to provide the
      server with the value for key identifier and hmac as provided by
      your CA.
      While working on some servers, EAB handling is not uniform
      across CAs. First tests with a Sectigo Certificate Manager in
      demo mode are successful. But ZeroSSL, for example, seems to
      regard EAB values as a one-time-use-only thing, which makes them
      fail if you create a seconde account or retry the creation of the
      first account with the same EAB.
    - The directive 'MDCertificateAuthority' now checks if its parameter
      is a http/https url or one of a set of known names. Those are
      'LetsEncrypt', 'LetsEncrypt-Test', 'Buypass' and 'Buypass-Test'
      for now and they are not case-sensitive.
      The default of LetsEncrypt is unchanged.
    - `MDContactEmail` can now be specified inside a `<MDomain dnsname>`
      section.
    - Treating 401 HTTP status codes for orders like 403, since some ACME
      servers seem to prefer that for accessing oders from other accounts.
    - When retrieving certificate chains, try to read the response even
      if the HTTP Content-Type is unrecognized.
    - Fixed a bug that reset the error counter of a certificate renewal
      and prevented the increasing delays in further attempts.
    - Fixed the renewal process giving up every time on an already existing
      order with some invalid domains. Now, if such are seen in a previous
      order, a new order is created for a clean start over again.
      See <https://github.com/icing/mod_md/issues/268>
    - Fixed a mixup in md-status handler when static certificate files
      and renewal was configured at the same time.

  *) mod_md: values for External Account Binding (EAB) can
     now also be configured to be read from a separate JSON
     file. This allows to keep server configuration permissions
     world readable without exposing secrets.
     [Stefan Eissing]

  *) mod_proxy_uwsgi: Remove duplicate slashes at the beginning of PATH_INFO.
     PR 65616.  [Ruediger Pluem]

Changes with Apache 2.4.51

  *) SECURITY: CVE-2021-42013: Path Traversal and Remote Code
     Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete
     fix of CVE-2021-41773) (cve.mitre.org)
     It was found that the fix for CVE-2021-41773 in Apache HTTP
     Server 2.4.50 was insufficient.  An attacker could use a path
     traversal attack to map URLs to files outside the directories
     configured by Alias-like directives.
     If files outside of these directories are not protected by the
     usual default configuration "require all denied", these requests
     can succeed. If CGI scripts are also enabled for these aliased
     paths, this could allow for remote code execution.
     This issue only affects Apache 2.4.49 and Apache 2.4.50 and not
     earlier versions.
     Credits: Reported by Juan Escobar from Dreamlab Technologies,
     Fernando Muñoz from NULL Life CTF Team, and Shungo Kumasaka

  *) core: Add ap_unescape_url_ex() for better decoding control, and deprecate
     unused AP_NORMALIZE_DROP_PARAMETERS flag.
     [Yann Ylavic, Ruediger Pluem, Stefan Eissing, Joe Orton]

Changes with Apache 2.4.50

  *) SECURITY: CVE-2021-41773: Path traversal and file disclosure
     vulnerability in Apache HTTP Server 2.4.49 (cve.mitre.org)
     A flaw was found in a change made to path normalization in
     Apache HTTP Server 2.4.49. An attacker could use a path
     traversal attack to map URLs to files outside the expected
     document root.
     If files outside of the document root are not protected by
     "require all denied" these requests can succeed. Additionally
     this flaw could leak the source of interpreted files like CGI
     scripts.
     This issue is known to be exploited in the wild.
     This issue only affects Apache 2.4.49 and not earlier versions.
     Credits: This issue was reported by Ash Daulton along with the
     cPanel Security Team

  *) SECURITY: CVE-2021-41524: null pointer dereference in h2 fuzzing
     (cve.mitre.org)
     While fuzzing the 2.4.49 httpd, a new null pointer dereference
     was detected during HTTP/2 request processing,
     allowing an external source to DoS the server. This requires a
     specially crafted request.
     The vulnerability was recently introduced in version 2.4.49. No
     exploit is known to the project.
     Credits: Apache httpd team would like to thank LI ZHI XIN from
     NSFocus Security Team for reporting this issue.

  *) core: AP_NORMALIZE_DECODE_UNRESERVED should normalize the second dot in
     the uri-path when it's preceded by a dot.  [Yann Ylavic]

  *) mod_md: when MDMessageCmd for a 'challenge-setup:<type>:<dnsname>'
     fails (!= 0 exit), the renewal process is aborted and an error is
     reported for the MDomain. This provides scripts that distribute
     information in a cluster to abort early with bothering an ACME
     server to validate a dns name that will not work. The common
     retry logic will make another attempt in the future, as with
     other failures.
     Fixed a bug when adding private key specs to an already working
     MDomain, see <https://github.com/icing/mod_md/issues/260>.
     [Stefan Eissing]

  *) mod_proxy: Handle UDS URIs with empty hostname ("unix:///...") as if they
     had no hostname ("unix:/...").  [Yann Ylavic]

  *) mod_md: fixed a bug in handling multiple parallel OCSP requests. These could
     run into an assertion which terminated (and restarted) the child process where
     the task was running. Eventually, all OCSP responses were collected, but not
     in the way that things are supposed to work.
     See also <https://bz.apache.org/bugzilla/show_bug.cgi?id=65567>.
     The bug was possibly triggered when more than one OCSP status needed updating
     at the same time. For example for several renewed certificates after a server
     reload.

  *) mod_rewrite: Fix UDS ("unix:") scheme for [P] rules.  PR 57691 + 65590.
     [Janne Peltonen <janne.peltonen sange.fi>]

  *) event mpm: Correctly count active child processes in parent process if
     child process dies due to MaxConnectionsPerChild.
     PR 65592 [Ruediger Pluem]

  *) mod_http2: when a server is restarted gracefully, any idle h2 worker
     threads are shut down immediately.
     Also, change OpenSSL API use for deprecations in OpenSSL 3.0.
     Adds all other, never proposed code changes to make a clean
     sync of http2 sources. [Stefan Eissing]

  *) mod_dav: Correctly handle errors returned by dav providers on REPORT
     requests. [Ruediger Pluem]

  *) core: do not install core input/output filters on secondary
     connections. [Stefan Eissing]

  *) core: Add ap_pre_connection() as a wrapper to ap_run_pre_connection()
     and use it to prevent that failures in running the pre_connection
     hook cause crashes afterwards. [Ruediger Pluem]

  *) mod_speling: Add CheckBasenameMatch PR 44221.  [Christophe Jaillet]

Changes with Apache 2.4.49

  *) SECURITY: CVE-2021-40438 (cve.mitre.org)
     mod_proxy: Server Side Request Forgery (SSRF) vulnerability [Yann Ylavic]

  *) SECURITY: CVE-2021-39275 (cve.mitre.org)
     core: ap_escape_quotes buffer overflow

  *) SECURITY: CVE-2021-36160 (cve.mitre.org)
     mod_proxy_uwsgi: Out of bound read vulnerability [Yann Ylavic]

  *) SECURITY: CVE-2021-34798 (cve.mitre.org)
     core: null pointer dereference on malformed request

  *) SECURITY: CVE-2021-33193 (cve.mitre.org)
     mod_http2: Request splitting vulnerability with mod_proxy [Stefan Eissing]

  *) core/mod_proxy/mod_ssl:
     Adding `outgoing` flag to conn_rec, indicating a connection is
     initiated by the server to somewhere, in contrast to incoming
     connections from clients.
     Adding 'ap_ssl_bind_outgoing()` function that marks a connection
     as outgoing and is used by mod_proxy instead of the previous
     optional function `ssl_engine_set`. This enables other SSL
     module to secure proxy connections.
     The optional functions `ssl_engine_set`, `ssl_engine_disable` and
     `ssl_proxy_enable` are now provided by the core to have backward
     compatibility with non-httpd modules that might use them. mod_ssl
     itself no longer registers these functions, but keeps them in its
     header for backward compatibility.
     The core provided optional function wrap any registered function
     like it was done for `ssl_is_ssl`.
     [Stefan Eissing]

  *) mod_ssl: Support logging private key material for use with
     wireshark via log file given by SSLKEYLOGFILE environment
     variable.  Requires OpenSSL 1.1.1.  PR 63391.  [Joe Orton]

  *) mod_proxy: Do not canonicalize the proxied URL when both "nocanon" and
     "ProxyPassInterpolateEnv On" are configured.  PR 65549.
     [Joel Self <joelself gmail.com>]

  *) mpm_event: Fix children processes possibly not stopped on graceful
     restart.  PR 63169.  [Joel Self <joelself gmail.com>]

  *) mod_proxy: Fix a potential infinite loop when tunneling Upgrade(d)
     protocols from mod_proxy_http, and a timeout triggering falsely when
     using mod_proxy_wstunnel, mod_proxy_connect or mod_proxy_http with
     upgrade= setting.  PRs 65521 and 65519.  [Yann Ylavic]

  *) mod_unique_id: Reduce the time window where duplicates may be generated
     PR 65159
     [Christophe Jaillet]

  *) mpm_prefork: Block signals for child_init hooks to prevent potential
     threads created from there to catch MPM's signals.
     [Ruediger Pluem, Yann Ylavic]

  *) Revert "mod_unique_id: Fix potential duplicated ID generation under heavy load.
     PR 65159" added in 2.4.47.
     This causes issue on Windows.
     [Christophe Jaillet]

  *) mod_proxy_uwsgi: Fix PATH_INFO setting for generic worker.  [Yann Ylavic]

  *) mod_md: Certificate/keys pairs are verified as matching before a renewal is accepted
     as successful or a staged renewal is replacing the existing certificates.
     This avoid potential mess ups in the md store file system to render the active
     certificates non-working. [@mkauf]

  *) mod_proxy: Faster unix socket path parsing in the "proxy:" URL.
     [Yann Ylavic]

  *) mod_ssl: tighten the handling of ALPN for outgoing (proxy)
     connections. If ALPN protocols are provided and sent to the
     remote server, the received protocol selected is inspected
     and checked for a match. Without match, the peer handshake
     fails.
     An exception is the proposal of "http/1.1" where it is
     accepted if the remote server did not answer ALPN with
     a selected protocol. This accommodates for hosts that do
     not observe/support ALPN and speak http/1.x be default.

  *) mod_proxy: Fix possible reuse/merging of Proxy(Pass)Match worker instances
     with others when their URLs contain a '$' substitution.  PR 65419 + 65429.
     [Yann Ylavic]

  *) mod_dav: Add method_precondition hook. WebDAV extensions define
     conditions that must exist before a WebDAV method can be executed.
     This hook allows a WebDAV extension to verify these preconditions.
     [Graham Leggett]

  *) Add hooks deliver_report and gather_reports to mod_dav.h. Allows other
     modules apart from versioning implementations to handle the REPORT method.
     [Graham Leggett]

  *) Add dav_get_provider(), dav_open_lockdb(), dav_close_lockdb() and
     dav_get_resource() to mod_dav.h. [Graham Leggett]

  *) core: fix ap_escape_quotes substitution logic. [Eric Covener]

  *) core/mpm: add hook 'child_stopping` that gets called when the MPM is
     stopping a child process. The additional `graceful` parameter allows
     registered hooks to free resources early during a graceful shutdown.
     [Yann Ylavic, Stefan Eissing]

  *) mod_proxy: Fix icomplete initialization of BalancerMember(s) from the
     balancer-manager, which can lead to a crash.  [Yann Ylavic]

  *) mpm_event: Fix graceful stop/restart of children processes if connections
     are in lingering close for too long.  [Yann Ylavic]

  *) mod_md: fixed a potential null pointer dereference if ACME/OCSP
     server returned 2xx responses without content type. Reported by chuangwen.
     [chuangwen, Stefan Eissing]

  *) mod_md:
     - Domain names in `<MDomain ...>` can now appear in quoted form.
     - Fixed a failure in ACME challenge selection that aborted further searches
       when the tls-alpn-01 method did not seem to be suitable.
     - Changed the tls-alpn-01 setup to only become unsuitable when none of the
       dns names showed support for a configured 'Protocols ... acme-tls/1'. This
       allows use of tls-alpn-01 for dns names that are not mapped to a VirtualHost.
     [Stefan Eissing]

  *) Add CPING to health check logic. [Jean-Frederic Clere]

  *) core: Split ap_create_request() from ap_read_request(). [Graham Leggett]

  *) core, h2: common ap_parse_request_line() and ap_check_request_header()
     code. [Yann Ylavic]

  *) core: Add StrictHostCheck to allow unconfigured hostnames to be
     rejected. [Eric Covener]

  *) htcacheclean: Improve help messages.  [Christophe Jaillet]

Changes with Apache 2.4.48

  *) SECURITY: CVE-2021-31618 (cve.mitre.org)
     mod_http2: Fix a potential NULL pointer dereference [Ivan Zhakov]

  *) mod_proxy_wstunnel: Add ProxyWebsocketFallbackToProxyHttp to opt-out the
     fallback to mod_proxy_http for WebSocket upgrade and tunneling.
     [Yann Ylavic]

  *) mod_proxy: Fix flushing of THRESHOLD_MIN_WRITE data while tunneling.
     PR 65294.  [Yann Ylavic]

  *) core: Fix a regression that stripped the ETag header from 304 responses.
     PR 61820 [Ruediger Pluem, Roy T. Fielding]

  *) core: Adding SSL related inquiry functions to the server API.
     These function are always available, even when no module providing
     SSL is loaded. They provide their own "shadowing" implementation for
     the optional functions of similar name that mod_ssl and impersonators
     of mod_ssl provide.
     This enables loading of several SSL providing modules when all but
     one of them registers itself into the new hooks. Two old-style SSL
     modules will not work, as they replace the others optional functions
     with their own.
     Modules using the old-style optional functions will continue to work
     as core supplies its own versions of those.
     The following has been added so far:
     - ap_ssl_conn_is_ssl() to query if a connection is using SSL.
     - ap_ssl_var_lookup() to query SSL related variables for a
       server/connection/request.
     - Hooks for 'ssl_conn_is_ssl' and 'ssl_var_lookup' where modules
       providing SSL can install their own value supplying functions.
     - ap_ssl_add_cert_files() to enable other modules like mod_md to provide
       certificate and keys for an SSL module like mod_ssl.
     - ap_ssl_add_fallback_cert_files() to enable other modules like mod_md to
       provide a fallback certificate in case no 'proper' certificate is
       available for an SSL module like mod_ssl.
     - ap_ssl_answer_challenge() to enable other modules like mod_md to
       provide a certificate as used in the RFC 8555 'tls-alpn-01' challenge
       for the ACME protocol for an SSL module like mod_ssl. The function
       and its hook provide PEM encoded data instead of file names.
     - Hooks for 'ssl_add_cert_files', 'ssl_add_fallback_cert_files' and
       'ssl_answer_challenge' where modules like mod_md can provide providers
       to the above mentioned functions.
     - These functions reside in the new 'http_ssl.h' header file.
     [Stefan Eissing]

  *) core/mod_ssl/mod_md: adding OCSP response provisioning as core feature. This
     allows modules to access and provide OCSP response data without being tied
     of each other. The data is exchanged in standard, portable formats (PEM encoded
     certificates and DER encoded responses), so that the actual SSL/crypto
     implementations used by the modules are independant of each other.
     Registration and retrieval happen in the context of a server (server_rec)
     which modules may use to decide if they are configured for this or not.
     The area of changes:
     1. core: defines 2 functions in include/http_ssl.h, so that modules may
        register a certificate, together with its issuer certificate for OCSP
        response provisioning and ask for current response data (DER bytes) later.
        Also, 2 hooks are defined that allow modules to implement this OCSP
        provisioning.
     2. mod_ssl uses the new functions, in addition to what it did already, to
        register its certificates this way. If no one is interested in providing
        OCSP, it falls back to its own (if configured) stapling implementation.
     3. mod_md registers itself at the core hooks for OCSP provisioning. Depending
        on configuration, it will accept registrations of its own certificates only,
        all certificates or none.
     [Stefan Eissing]

 *) mod_md: v2.4.0 with improvements and bugfixes
     - MDPrivateKeys allows the specification of several types. Beside "RSA" plus
     optional key lengths elliptic curves can be configured. This means you can
     have multiple certificates for a Managed Domain with different key types.
     With ```MDPrivateKeys secp384r1 rsa2048``` you get one ECDSA  and one RSA
     certificate and all modern client will use the shorter ECDSA, while older
     client will get the RSA certificate.
     Many thanks to @tlhackque who pushed and helped on this.
     - Support added for MDomains consisting of a wildcard. Configuring
     ```MDomain *.host.net``` will match all virtual hosts matching that pattern
     and obtain one certificate for it (assuming you have 'dns-01' challenge
     support configured). Addresses #239.
     - Removed support for ACMEv1 servers. The only known installation used to
     be Let's Encrypt which has disabled that version more than a year ago for
     new accounts.
     - Andreas Ulm (<https://github.com/root360-AndreasUlm>) implemented the
     ```renewing``` call to ```MDMessageCmd``` that can deny a certificate
     renewal attempt. This is useful in clustered installations, as
     discussed in #233).
     - New event ```challenge-setup:<type>:<domain>```, triggered when the
     challenge data for a domain has been created. This is invoked before the
     ACME server is told to check for it. The type is one of the ACME challenge
     types. This is invoked for every DNS name in a MDomain.
     - The max delay for retries has been raised to daily (this is like all
     retries jittered somewhat to avoid repeats at fixed time of day).
     - Certain error codes reported by the ACME server that indicate a problem
     with the configured data now immediately switch to daily retries. For
     example: if the ACME server rejects a contact email or a domain name,
     frequent retries will most likely not solve the problem. But daily retries
     still make sense as there might be an error at the server and un-supervised
     certificate renewal is the goal. Refs #222.
     - Test case and work around for domain names > 64 octets. Fixes #227.
     When the first DNS name of an MD is longer than 63 octets, the certificate
     request will not contain a CN field, but leave it up to the CA to choose one.
     Currently, Lets Encrypt looks for a shorter name in the SAN list given and
     fails the request if none is found. But it is really up to the CA (and what
     browsers/libs accept here) and may change over the years. That is why
     the decision is best made at the CA.
     - Retry delays now have a random +/-[0-50]% modification applied to let
     retries from several servers spread out more, should they have been
     restarted at the same time of day.
     - Fixed several places where the 'badNonce' return code from an ACME server
     was not handled correctly. The test server 'pebble' simulates this behaviour
     by default and helps nicely in verifying this behaviour. Thanks, pebble!
     - Set the default `MDActivationDelay` to 0. This was confusing to users that
     new certificates were deemed not usably before a day of delay. When clocks are
     correct, using a new certificate right away should not pose a problem.
     - When handling ACME authorization resources, the module no longer requires
     the server to return a "Location" header, as was necessary in ACMEv1.
     Fixes #216.
     - Fixed a theoretical uninitialized read when testing for JSON error responses
     from the ACME CA. Reported at <https://bz.apache.org/bugzilla/show_bug.cgi?id=64297>.
     - ACME problem reports from CAs that include parameters in the Content-Type
     header are handled correctly. (Previously, the problem text would not be
     reported and retries could exceed CA limits.)
     - Account Update transactions to V2 CAs now use the correct POST-AS-GET method.
     Previously, an empty JSON object was sent - which apparently LE accepted,
     but others reject.
     [Stefan Eissing, @tlhackque, Andreas Ulm]

Changes with Apache 2.4.47

  *) SECURITY: CVE-2021-30641 (cve.mitre.org)
     Unexpected <Location> section matching with 'MergeSlashes OFF'

  *) SECURITY: CVE-2020-35452 (cve.mitre.org)
     mod_auth_digest: possible stack overflow by one nul byte while validating
     the Digest nonce.  [Yann Ylavic]

  *) SECURITY: CVE-2021-26691 (cve.mitre.org)
     mod_session: Fix possible crash due to NULL pointer dereference, which
     could be used to cause a Denial of Service with a malicious backend
     server and SessionHeader.  [Yann Ylavic]

  *) SECURITY: CVE-2021-26690 (cve.mitre.org)
     mod_session: Fix possible crash due to NULL pointer dereference, which
     could be used to cause a Denial of Service.  [Yann Ylavic]

  *) SECURITY: CVE-2020-13950 (cve.mitre.org)
     mod_proxy_http: Fix possible crash due to NULL pointer dereference, which
     could be used to cause a Denial of Service.  [Yann Ylavic]

  *) SECURITY: CVE-2020-13938 (cve.mitre.org)
     Windows: Prevent local users from stopping the httpd process [Ivan Zhakov]

  *) SECURITY: CVE-2019-17567 (cve.mitre.org)
     mod_proxy_wstunnel, mod_proxy_http: Handle Upgradable protocols end-to-end
     negotiation.  [Yann Ylavic]

  *) mod_dav_fs: Improve logging output when failing to open files for
     writing.  PR 64413.  [Bingyu Shen <ahshenbingyu gmail.com>]

  *) mod_http2: Fixed a race condition that could lead to streams being
     aborted (RST to the client), although a response had been produced.
     [Stefan Eissing]

  *) mod_lua: Add support to Lua 5.4  [Joe Orton, Giovanni Bechis, Ruediger Pluem]

  *) MPM event/worker: Fix possible crash in child process on early signal
     delivery.  PR 64533.  [Ruediger Pluem]

  *) mod_http2: sync with github standalone version 1.15.17
     - Log requests and sent the configured error response in case of early detected
       errors like too many or too long headers. [Ruediger Pluem]
     - new option 'H2OutputBuffering on/off' which controls the buffering of stream output.
       The default is on, which is the behaviour of older mod-h2 versions. When off, all
       bytes are made available immediately to the main connection for sending them
       out to the client. This fixes interop issues with certain flavours of gRPC, see
       also <https://github.com/icing/mod_h2/issues/207>.
       [Stefan Eissing]

  *) mod_unique_id: Fix potential duplicated ID generation under heavy load.
     PR 65159
     [Jonas Müntener <jonas.muentener ergon.ch>, Christophe Jaillet]

  *) "[mod_dav_fs etag handling] should really honor the FileETag setting".
     - It now does.
     - Add "Digest" to FileETag directive, allowing a strong ETag to be
       generated using a file digest.
     - Add ap_make_etag_ex() and ap_set_etag_fd() to allow full control over
       ETag generation.
     - Add concept of "binary notes" to request_rec, allowing packed bit flags
       to be added to a request.
     - First binary note - AP_REQUEST_STRONG_ETAG - allows modules to force
       the ETag to a strong ETag to comply with RFC requirements, such as those
       mandated by various WebDAV extensions.
     [Graham Leggett]

  *) mod_proxy_http: Fix a possibly crash when the origin connection gets
     interrupted before completion.  PR 64234.
     [Barnim Dzwillo <dzwillo strato.de>, Ruediger Pluem]

  *) mod_ssl: Do not keep connections to OCSP responders alive when doing
     OCSP requests.  PR 64135.  [Ruediger Pluem]

  *) mod_ssl: Improve the coalescing filter to buffer into larger TLS
     records, and avoid revealing the HTTP header size via TLS record
     boundaries (for common response generators).
     [Joe Orton, Ruediger Pluem]

  *) mod_proxy_hcheck: Don't pile up health checks if the previous one did
     not finish before hcinterval.  PR 63010.  [Yann Ylavic]

  *) mod_session: Improve session parsing.  [Yann Yalvic]

  *) mod_authnz_ldap: Prevent authentications with empty passwords for the
     initial bind to fail with status 500. [Ruediger Pluem]

  *) mod_proxy_fcgi: Honor "SetEnv proxy-sendcl" to forward a chunked
     Transfer-Encoding from the client, spooling the request body when needed
     to provide a Content-Length to the backend.  PR 57087.  [Yann Ylavic]

  *) mod_proxy: Improve tunneling loop to support half closed connections and
     pending data draining (for protocols like rsync). PR 61616. [Yann Ylavic]

  *) mod_proxy_wstunnel: Leave Upgrade requests handling to mod_proxy_http,
     allowing for (non-)Upgrade negotiation with the origin server.
     [Yann Ylavic]

  *) mod_proxy: Allow ProxyErrorOverride to be restricted to specific status
     codes.  PR63628. [Martin Drößler <mail martindroessler.de>]

  *) core: Add ReadBufferSize, FlushMaxThreshold and FlushMaxPipelined
     directives.  [Yann Ylavic]

  *) core: Ensure that aborted connections are logged as such. PR 62823
     [Arnaud Grandville <contact@grandville.net>]

  *) http: Allow unknown response status' lines returned in the form of
     "HTTP/x.x xxx Status xxx".  [Yann Ylavic]

  *) mod_proxy_http: Fix 100-continue deadlock for spooled request bodies,
     leading to Request Timeout (408).  PR 63855.  [Yann Ylavic]

  *) core: Remove headers on 304 Not Modified as specified by RFC7234, as
     opposed to passing an explicit subset of headers. PR 61820.
     [Giovanni Bechis]

  *) mpm_event: Don't reset connections after lingering close, restoring prior
     to 2.4.28 behaviour.  [Yann Ylavic]

  *) mpm_event: Kill connections in keepalive state only when there is no more
     workers available, not when the maximum number of connections is reached,
     restoring prior to 2.4.30 behaviour.  [Yann Ylavic]

  *) mod_unique_id: Use base64url encoding for UNIQUE_ID variable,
     avoiding the use of '@'.  PR 57044.
     [Michael Kaufmann <apache-bugzilla michael-kaufmann.ch>]

  *) mod_rewrite: Extend the [CO] (cookie) flag of RewriteRule to accept a
     SameSite attribute. [Eric Covener]

  *) mod_proxy: Add proxy check_trans hook.  This allows proxy
     modules to decline request handling at early stage.

  *) mod_proxy_wstunnel: Decline requests without an Upgrade
     header so ws/wss can be enabled overlapping with later
     http/https.

  *) mod_http2: Log requests and sent the configured error response in case of
     early detected errors like too many or too long headers.
     [Ruediger Pluem, Stefan Eissing]

  *) mod_md: Lowered the required minimal libcurl version from 7.50 to 7.29
     as proposed by <alexander.gerasimov codeit.pro>. [Stefan Eissing]

  *) mod_ssl: Fix request body buffering with PHA in TLSv1.3.  [Joe Orton]

  *) mod_proxy_uwsgi: Fix a crash when sending environment variables with no
     value. PR 64598 [Ruediger Pluem]

  *) mod_proxy: Recognize parameters from ProxyPassMatch workers with dollar
     substitution, such that they apply to the backend connection.  Note that
     connection reuse is disabled by default to avoid compatibility issues.
     [Takashi Sato, Jan Kaluza, Eric Covener, Yann Ylavic, Jean-Frederic Clere]

Changes with Apache 2.4.46

  *) SECURITY: CVE-2020-11984 (cve.mitre.org)
     mod_proxy_uwsgi: Malicious request may result in information disclosure
     or RCE of existing file on the server running under a malicious process
     environment. [Yann Ylavic]

  *) SECURITY: CVE-2020-11993 (cve.mitre.org)
     mod_http2: when throttling connection requests, log statements
     where possibly made that result in concurrent, unsafe use of
     a memory pool. [Stefan Eissing]

  *) SECURITY: CVE-2020-9490 (cve.mitre.org)
     mod_http2: a specially crafted value for the 'Cache-Digest' header
     request would result in a crash when the server actually tries
     to HTTP/2 PUSH a resource afterwards. [Stefan Eissing]

  *) mod_proxy_fcgi: Fix missing APLOGNO macro argument
     [Eric Covener, Christophe Jaillet]

Changes with Apache 2.4.45

  *) mod_http2: remove support for abandoned http-wg draft
     <https://datatracker.ietf.org/doc/draft-kazuho-h2-cache-digest/>.
     [Stefan Eissing]

Changes with Apache 2.4.44

  *) mod_proxy_uwsgi: Error out on HTTP header larger than 16K (hard
     protocol limit).  [Yann Ylavic]

  *) mod_http2:
     Fixes <https://github.com/icing/mod_h2/issues/200>:
     "LimitRequestFields 0" now disables the limit, as documented.
     Fixes <https://github.com/icing/mod_h2/issues/201>:
     Do not count repeated headers with same name against the field
     count limit. The are merged internally, as if sent in a single HTTP/1 line.
     [Stefan Eissing]

  *) mod_http2: Avoid segfaults in case of handling certain responses for
     already aborted connections.  [Stefan Eissing, Ruediger Pluem]

  *) mod_http2: The module now handles master/secondary connections and has marked
     methods according to use. [Stefan Eissing]

  *) core: Drop an invalid Last-Modified header value coming
     from a FCGI/CGI script instead of replacing it with Unix epoch.
     [Yann Ylavic, Luca Toscano]

  *) Add support for strict content-length parsing through addition of
     ap_parse_strict_length() [Yann Ylavic]

  *) mod_proxy_fcgi: ProxyFCGISetEnvIf unsets variables when expression
     evaluates to false.  PR64365. [Michael König <mail ikoenig.net>]

  *) mod_proxy_http: flush spooled request body in one go to avoid
     leaking (or long lived) temporary file. PR 64452. [Yann Ylavic]

  *) mod_ssl: Fix a race condition and possible crash when using a proxy client
     certificate (SSLProxyMachineCertificateFile).
     [Armin Abfalterer <a.abfalterer gmail.com>]

  *) mod_ssl: Fix memory leak in stapling code. PR63687. [Stefan Eissing]

  *) mod_http2: Fixed regression that no longer set H2_STREAM_ID and H2_STREAM_TAG.
     PR64330 [Stefan Eissing]

  *) mod_http2: Fixed regression that caused connections to close when mod_reqtimeout
     was configured with a handshake timeout. Fixes gitub issue #196.
     [Stefan Eissing]

  *) mod_proxy_http2: the "ping" proxy parameter
     (see <https://httpd.apache.org/docs/2.4/mod/mod_proxy.html>) is now used
     when checking the liveliness of a new or reused h2 connection to the backend.
     With short durations, this makes load-balancing more responsive. The module
     will hold back requests until ping conditions are met, using features of the
     HTTP/2 protocol alone. [Ruediger Pluem, Stefan Eissing]

  *) core: httpd is no longer linked against -lsystemd if mod_systemd
     is enabled (and built as a DSO).  [Rainer Jung]

  *) mod_proxy_http2: respect ProxyTimeout settings on backend connections
     while waiting on incoming data. [Ruediger Pluem, Stefan Eissing]

Changes with Apache 2.4.43

  *) mod_ssl: Fix memory leak of OCSP stapling response. [Yann Ylavic]

Changes with Apache 2.4.42

  *) SECURITY: CVE-2020-1934 (cve.mitre.org)
     mod_proxy_ftp: Use of uninitialized value with malicious backend FTP
     server. [Eric Covener]

  *) SECURITY: CVE-2020-1927 (cve.mitre.org)
     rewrite, core: Set PCRE_DOTALL flag by default to avoid unpredictable
     matches and substitutions with encoded line break characters.
     The fix for CVE-2019-10098 was not effective.  [Ruediger Pluem]

  *) mod_proxy_http: Fix the forwarding of requests with content body when a
     balancer member is unavailable; the retry on the next member was issued
     with an empty body (regression introduced in 2.4.41). PR63891.
     [Yann Ylavic]

  *) core: Use a temporary file when writing the pid file, avoiding
     startup failure if an empty pidfile is left over from a
     previous crashed or aborted invocation of httpd.  PR 63140.
     [Nicolas Carrier <carrier.nicolas0 gmail.com>, Joe Orton]

  *) mod_http2: Fixes issue where mod_unique_id would generate non-unique request
     identifier under load, see <https://github.com/icing/mod_h2/issues/195>.
     [Michael Kaufmann, Stefan Eissing]

  *) mod_proxy_hcheck: Allow healthcheck expressions to use %{Content-Type}.
     PR64140. [Renier Velazco <renier.velazco upr.edu>]

  *) mod_authz_groupfile: Drop AH01666 from loglevel "error" to "info".
     PR64172.

  *) mod_usertrack: Add CookieSameSite, CookieHTTPOnly, and CookieSecure
     to allow customization of the usertrack cookie. PR64077.
     [Prashant Keshvani <prashant2400 gmail.com>, Eric Covener]

  *) mod_proxy_ajp: Add "secret" parameter to proxy workers to implement legacy
     AJP13 authentication.  PR 53098. [Dmitry A. Bakshaev <dab1818 gmail com>]

  *) mpm_event: avoid possible KeepAliveTimeout off by -100 ms.
     [Eric Covener, Yann Ylavic]

  *) Add a config layout for OpenWRT. [Graham Leggett]

  *) Add support for cross compiling to apxs. If apxs is being executed from
     somewhere other than its target location, add that prefix to includes and
     library directories. Without this, apxs would fail to find config_vars.mk
     and exit. [Graham Leggett]

  *) mod_ssl: Disable client verification on ACME ALPN challenges. Fixes github
     issue mod_md#172 (https://github.com/icing/mod_md/issues/172).
     [Michael Kaufmann <mail michael-kaufmann.ch>, Stefan Eissing]

  *) mod_ssl: use OPENSSL_init_ssl() to initialise OpenSSL on versions 1.1+.
     [Graham Leggett]

  *) mod_ssl: Support use of private keys and certificates from an
     OpenSSL ENGINE via PKCS#11 URIs in SSLCertificateFile/KeyFile.
     [Anderson Sasaki <ansasaki redhat.com>, Joe Orton]

  *) mod_md:
     - Prefer MDContactEmail directive to ServerAdmin for registration. New directive
       thanks to Timothe Litt (@tlhackque).
     - protocol check for pre-configured "tls-alpn-01" challenge has been improved. It will now
       check all matching virtual hosts for protocol support. Thanks to @mkauf.
     - Corrected a check when OCSP stapling was configured for hosts
       where the responsible MDomain is not clear, by Michal Karm Babacek (@Karm).
     - Softening the restrictions where mod_md configuration directives may appear. This should
       allow for use in <If> and <Macro> sections. If all possible variations lead to the configuration
       you wanted in the first place, is another matter.
     [Michael Kaufmann <mail michael-kaufmann.ch>, Timothe Litt (@tlhackque),
      Michal Karm Babacek (@Karm), Stefan Eissing (@icing)]

  *) test: Added continuous testing with Travis CI.
     This tests various scenarios on Ubuntu with the full test suite.
     Architectures tested: amd64, s390x, ppc64le, arm64
     The tests pass successfully.
     [Luca Toscano, Joe Orton, Mike Rumph, and others]

  *) core: Be stricter in parsing of Transfer-Encoding headers.
     [ZeddYu <zeddyu.lu gmail.com>, Eric Covener]

  *) mod_ssl: negotiate the TLS protocol version per name based vhost
     configuration, when linked with OpenSSL-1.1.1 or later. The base vhost's
     SSLProtocol (from the first vhost declared on the IP:port) is now only
     relevant if no SSLProtocol is declared for the vhost or globally,
     otherwise the vhost or global value apply.  [Yann Ylavic]

  *) mod_cgi, mod_cgid: Fix a memory leak in some error cases with large script
     output.  PR 64096.  [Joe Orton]

  *) config: Speed up graceful restarts by using pre-hashed command table. PR 64066.
     [Giovanni Bechis <giovanni paclan.it>, Jim Jagielski]

  *) mod_systemd: New module providing integration with systemd.  [Jan Kaluza]

  *) mod_lua: Add r:headers_in_table, r:headers_out_table, r:err_headers_out_table,
     r:notes_table, r:subprocess_env_table as read-only native table alternatives
     that can be iterated over. [Eric Covener]

  *) mod_http2: Fixed rare cases where a h2 worker could deadlock the main connection.
     [Yann Ylavic, Stefan Eissing]

  *) mod_lua: Accept nil assignments to the exposed tables (r.subprocess_env,
     r.headers_out, etc) to remove the key from the table. PR63971.
     [Eric Covener]

  *) mod_http2: Fixed interaction with mod_reqtimeout. A loaded mod_http2 was disabling the
     ssl handshake timeouts. Also, fixed a mistake of the last version that made `H2Direct`
     always `on`, regardless of configuration. Found and reported by
     <Armin.Abfalterer@united-security-providers.ch> and
     <Marcial.Rion@united-security-providers.ch>. [Stefan Eissing]

  *) mod_http2: Multiple field length violations in the same request no longer cause
     several log entries to be written. [@mkauf]

  *) mod_ssl: OCSP does not apply to proxy mode.  PR 63679.
     [Lubos Uhliarik <luhliari redhat.com>, Yann Ylavic]

  *) mod_proxy_html, mod_xml2enc: Fix build issues with macOS due to r1864469
     [Jim Jagielski]

  *) mod_authn_socache: Increase the maximum length of strings that can be cached by
     the module from 100 to 256.  PR 62149 [<thorsten.meinl knime.com>]

  *) mod_proxy: Fix crash by resolving pool concurrency problems. PR 63503
     [Ruediger Pluem, Eric Covener]

  *) core: On Windows, fix a start-up crash if <IfFile ...> is used with a path that is not
     valid (For example, testing for a file on a flash drive that is not mounted)
     [Christophe Jaillet]

  *) mod_deflate, mod_brotli: honor "Accept-Encoding: foo;q=0" as per RFC 7231; which
     means 'foo' is "not acceptable".  PR 58158 [Chistophe Jaillet]

  *) mod_md v2.2.3:
     - Configuring MDCAChallenges replaces any previous existing challenge configuration. It
       had been additive before which was not the intended behaviour. [@mkauf]
     - Fixing order of ACME challenges used when nothing else configured. Code now behaves as
       documented for `MDCAChallenges`. Fixes #156. Thanks again to @mkauf for finding this.
     - Fixing a potential, low memory null pointer dereference [thanks to @uhliarik].
     - Fixing an incompatibility with a change in libcurl v7.66.0 that added unwanted
       "transfer-encoding" to POST requests. This failed in direct communication with
       Let's Encrypt boulder server. Thanks to @mkauf for finding and fixing. [Stefan Eissing]

  *) mod_md: Adding the several new features.
     The module offers an implementation of OCSP Stapling that can replace fully or
     for a limited set of domains the existing one from mod_ssl. OCSP handling
     is part of mod_md's monitoring and message notifications. If can be used
     for sites that do not have ACME certificates.
     The url for a CTLog Monitor can be configured. It is used in the server-status
     to link to the external status page of a certificate.
     The MDMessageCmd is called with argument "installed" when a new certificate
     has been activated on server restart/reload. This allows for processing of
     the new certificate, for example to applications that require it in different
     locations or formats.
     [Stefan Eissing]

  *) mod_proxy_balancer: Fix case-sensitive referer check related to CSRF/XSS
     protection. PR 63688. [Armin Abfalterer <a.abfalterer gmail.com>]

Changes with Apache 2.4.41

  *) SECURITY: CVE-2019-10097 (cve.mitre.org)
     mod_remoteip: Fix stack buffer overflow and NULL pointer deference
     when reading the PROXY protocol header.  [Joe Orton,
     Daniel McCarney <cpu letsencrypt.org>]

  *) SECURITY: CVE-2019-9517 (cve.mitre.org)
     mod_http2: a malicious client could perform a DoS attack by flooding
        a connection with requests and basically never reading responses
        on the TCP connection. Depending on h2 worker dimensioning, it was
        possible to block those with relatively few connections. [Stefan Eissing]

  *) SECURITY: CVE-2019-10098 (cve.mitre.org)
     rewrite, core: Set PCRE_DOTALL flag by default to avoid unpredictable
     matches and substitutions with encoded line break characters.
     [Yann Ylavic]

  *) SECURITY: CVE-2019-10092 (cve.mitre.org)
     Remove HTML-escaped URLs from canned error responses to prevent misleading
     text/links being displayed via crafted links. [Eric Covener]

  *) SECURITY: CVE-2019-10082 (cve.mitre.org)
     mod_http2: Using fuzzed network input, the http/2 session
     handling could be made to read memory after being freed,
     during connection shutdown. [Stefan Eissing]

  *) SECURITY: CVE-2019-10081 (cve.mitre.org)
     mod_http2: HTTP/2 very early pushes, for example configured with "H2PushResource",
        could lead to an overwrite of memory in the pushing request's pool,
        leading to crashes. The memory copied is that of the configured push
        link header values, not data supplied by the client. [Stefan Eissing]

  *) mod_proxy_balancer: Improve balancer-manager protection against
     XSS/XSRF attacks from trusted users.  [Joe Orton,
     Niels Heinen <heinenn google.com>]

  *) mod_session: Introduce SessionExpiryUpdateInterval which allows to
     configure the session/cookie expiry's update interval. PR 57300.
     [Paul Spangler <paul.spangler ni.com>]

  *) modules/filters: Fix broken compilation when using old GCC (<4.2.x).
     PR 63633.  [Rainer Jung, Joe Orton]

  *) mod_ssl: Fix startup failure in 2.4.40 with SSLCertificateChainFile
     configured for a domain managed by mod_md.  [Stefan Eissing]

Changes with Apache 2.4.40

  *) core, mod_rewrite: Set PCRE_DOTALL by default. Revert via
     RegexDefaultOptions -DOTALL [Yann Ylavic]

  *) core: Remove request details from built-in error documents [Eric Covener]

  *) mod_http2: core setting "LimitRequestFieldSize" is not additionally checked on
     merged header fields, just as HTTP/1.1 does. [Stefan Eissing, Michael Kaufmann]

  *) mod_http2: fixed a bug that prevented proper stream cleanup when connection
     throttling was in place. Stream resets by clients on streams initiated by them
     are counted as possible trigger for throttling. [Stefan Eissing]

  *) mod_http2/mpm_event: Fixes the behaviour when a HTTP/2 connection has nothing
     more to write with streams ongoing (flow control block). The timeout waiting
     for the client to send WINODW_UPDATE was incorrectly KeepAliveTimeout and not
     Timeout as it should be. Fixes PR 63534. [Yann Ylavic, Stefan Eissing]

  *) mod_proxy_balancer: Load balancer required byrequests when bytraffic chosen.
     PR 62372. [Jim Jagielski]

  *) mod_proxy_hcheck: Create the configuration for mod_proxy_hcheck
     when used in BalancerMember. PR 60757. [Jean-Frederic Clere]

  *) mod_proxy_hcheck: Mute extremely frequent debug message. [Yann Ylavic]

  *) mod_ssl/mod_md: reversing dependency by letting mod_ssl offer hooks for
     adding certificates and keys to a virtual host. An additional hook allows
     answering special TLS connections as used in ACME challenges.
     Adding 2 new hooks for init/get of OCSP stapling status information when
     other modules want to provide those. Falls back to own implementation with
     same behaviour as before.
     [Stefan Eissing]

  *) mod_md: new features
     - protocol
       - supports the ACMEv2 protocol. It is the default and will be used on the next
         certificate renewal, unless another "MDCertificateAuthority" is configured
       - ACMEv2 endpoints use the GET via empty POST way of accessing resources, see
         announcement by Let's Encrypt:
         https://community.letsencrypt.org/t/acme-v2-scheduled-deprecation-of-unauthenticated-resource-gets/74380
     - challenges
       - new challenge method 'tls-alpn-01' implemented
       - challenge type 'tls-sni-01' has been removed as CAs do not offer this any longer
       - supports command configuration to setup/teardown 'dns-01' challenges
       - supports wildcard certificates when dns challenges are configured
     - status information and monitoring
       - a domain exposes its status at https://<domain>/.httpd/certificate-status
       - Managed Domains are now in Apache's 'server-status' page
       - A new handler 'md-status' exposes verbose status information in JSON format
     - new directives
       - "MDCertificateFile" and "MDCertificateKeyFile" to configure a
         Managed Domain that uses static files. Auto-renewal is turned off for those.
       - "MDMessageCmd" that is invoked on several events: 'renewed', 'expiring' and
         'errored'.
       - "MDWarnWindow" directive to configure when expiration warnings shall be issued.
     [Stefan Eissing]

  *) mod_mime_magic: Fix possible corruption of returned strings.
     [Christophe Jaillet]

  *) Default "conf/magic": Fix pattern for "audio/x-wav" for WAV files,
     remove "audio/unknown" pattern for other RIFF files.
     [Àngel Ollé Blázquez <aollebla redhat.com>]

  *) mod_proxy_http2: fixing a potential NULL pointer use in logging.
     [Christophe Jaillet, Dr Silvio Cesare InfoSect]

  *) mod_dav: Reduce the amount of memory needed when doing PROPFIND's on large
     collections by improving the memory management. [Joe Orton, Ruediger Pluem]

  *) mod_proxy_http2: adding support for handling trailers in both directions.
     PR 63502. [Stefan Eissing]

  *) mod_proxy_http: forward 100-continue, and minimize race conditions when
     reusing backend connections. PR 60330. [Yann Ylavic, Jean-Frederic Clere]

  *) mod_proxy_balancer: Fix some HTML syntax issues.  [Christophe Jaillet]

  *) When using mod_status with the Event MPM, report the number of requests
     associated with an active connection in the "ACC" field. Previously
     zero was always reported with this MPM.  PR60647. [Eric Covener]

  *) mod_http2: remove the no longer existing h2_ngn_shed.c from Cmake.
     [Stefan Eissing]

  *) mod_proxy/ssl: Proxy SSL client certificate configuration and other proxy
     SSL configurations broken inside <Proxy> context.  PR 63430.
     [Ruediger Pluem, Yann Ylavic]

  *) mod_proxy: allow SSLProxyCheckPeer* usage for all proxy modules.
     PR 61857.  [Markus Gausling <markusgausling googlemail.com>, Yann Ylavic]

  *) mod_reqtimeout: Fix default rates missing (not applied) in 2.4.39.
     PR 63325. [Yann Ylavic]

  *) mod_info: Fix output of server settings for PIPE_BUF in mod_info in
     the rare case that PIPE_BUF is defined. [Rainer Jung]

  *) mod_md: Store permissions are enforced on file creation, enforcing restrictions in
     spite of umask. Fixes <https://github.com/icing/mod_md/issues/117>. [Stefan Eissing]

Changes with Apache 2.4.39

  *) SECURITY: CVE-2019-0197 (cve.mitre.org)
     mod_http2: fixes a possible crash when HTTP/2 was enabled for a http:
     host or H2Upgrade was enabled for h2 on a https: host. An Upgrade
     request from http/1.1 to http/2 that was not the first request on a
     connection could lead to a misconfiguration and crash. Servers that
     never enabled the h2 protocol or only enabled it for https: and
     did not set "H2Upgrade on" are unaffected by this issue.
     [Stefan Eissing]

  *) SECURITY: CVE-2019-0196 (cve.mitre.org)
     mod_http2: using fuzzed network input, the http/2 request
     handling could be made to access freed memory in string
     comparison when determining the method of a request and
     thus process the request incorrectly. [Stefan Eissing]

  *) SECURITY: CVE-2019-0211 (cve.mitre.org)
     MPMs unix: Fix a local privilege escalation vulnerability by not
     maintaining each child's listener bucket number in the scoreboard,
     preventing unprivileged code like scripts run by/on the server (e.g. via
     mod_php) from modifying it persistently to abuse the privileged main
     process.  [Charles Fol <folcharles gmail.com>, Yann Ylavic]

  *) SECURITY: CVE-2019-0217 (cve.mitre.org)
     mod_auth_digest: Fix a race condition checking user credentials which
     could allow a user with valid credentials to impersonate another,
     under a threaded MPM.  PR 63124.  [Simon Kappel <simon.kappel axis.com>]

  *) SECURITY: CVE-2019-0215 (cve.mitre.org)
     mod_ssl: Fix access control bypass for per-location/per-dir client
     certificate verification in TLSv1.3.

  *) SECURITY: CVE-2019-0220 (cve.mitre.org)
     Merge consecutive slashes in URL's. Opt-out with
     `MergeSlashes OFF`. [Eric Covener]

  *) 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]

  *) 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]

  *) 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 recommended 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]

  *) 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]

  *) core: Split out the ability to parse wildcard files and directories
     from the Include/IncludeOptional directives into a generic set of
     functions ap_dir_nofnmatch() and ap_dir_fnmatch(). [Graham Leggett]

  *) 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]

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]

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]

  *) 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]

  *) 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
     of Redis as storage backend. [Jim Jagielski]

  *) mod_proxy_hcheck: Fix issues with interval determination. PR 62318
     [Jim Jagielski]

  *) mod_proxy_hcheck: Fix issues with TCP health checks. PR 61499
     [Dominik Stillhard <dominik.stillhard united-security-providers.ch>]

  *) mod_proxy_hcheck: take balancer's SSLProxy* directives into account.
     [Jim Jagielski]

  *) mod_status, mod_echo: Fix the display of client addresses.
    They were truncated to 31 characters which is not enough for IPv6 addresses.
    This is done by deprecating the use of the 'client' field and using
    the new 'client64' field in worker_score.
    PR 54848 [Bernhard Schmidt <berni birkenwald de>, Jim Jagielski]

Changes with Apache 2.4.35

  *) http: Enforce consistently no response body with both 204 and 304
     statuses.  [Yann Ylavic]

  *) mod_status: Cumulate CPU time of exited child processes in the
     "cu" and "cs" values. Add CPU time of the parent process to the
     "c" and "s" values.
     [Rainer Jung]

  *) mod_proxy: Improve the balancer member data shown in mod_status when
     "ProxyStatus" is "On": add "busy" count and show byte counts in
     auto mode always in units of kilobytes.  [Rainer Jung]

  *) mod_status: Add cumulated response duration time in milliseconds.
     [Rainer Jung]

  *) mod_status: Complete the data shown for async MPMs in "auto" mode.
     Added number of processes, number of stopping processes and number
     of busy and idle workers.  [Rainer Jung]

  *) mod_ratelimit: Don't interfere with "chunked" encoding, fixing regression
     introduced in 2.4.34.  PR 62568.  [Yann Ylavic]

  *) mod_proxy: Remove load order and link dependency between mod_lbmethod_*
     modules and mod_proxy. PR 62557. [Ruediger Pluem, William Rowe]

  *) Allow the argument to <IfFile>, <IfDefine>, <IfSection>, <IfDirective>,
     and <IfModule> to be quoted.  This is primarily for the benefit of
     <IfFile>. [Eric Covener]

  *) mod_watchdog: Correct some log messages.  [Rainer Jung]

  *) mod_md: When the last domain name from an MD is moved to another one,
     that now empty MD gets moved to the store archive. PR 62572.
     [Stefan Eissing]

  *) mod_ssl: Fix merging of SSLOCSPOverrideResponder.  [Jeff Trawick,
     [Frank Meier <frank meier ergon.ch>]

  *) mod_proxy_balancer: Restore compatibility with APR 1.4.  [Joe Orton]

Changes with Apache 2.4.34

  *) SECURITY: CVE-2018-8011 (cve.mitre.org)
     mod_md: DoS via Coredumps on specially crafted requests

  *) SECURITY: CVE-2018-1333 (cve.mitre.org)
     mod_http2: DoS for HTTP/2 connections by specially crafted requests

  *) Introduce zh-cn and zh-tw (simplified and traditional Chinese) error
     document translations. [CodeingBoy, popcorner]

  *) event: avoid possible race conditions with modules on the child pool.
     [Stefan Fritsch]

  *) mod_proxy: Fix a corner case where the ProxyPassReverseCookieDomain or
     ProxyPassReverseCookiePath directive could fail to update correctly
     'domain=' or 'path=' in the 'Set-Cookie' header.  PR 61560.
     [Christophe Jaillet]

  *) mod_ratelimit: fix behavior when proxing content. PR 62362.
     [Luca Toscano, Yann Ylavic]

  *) core: Re-allow '_' (underscore) in hostnames.
     [Eric Covener]

  *) mod_authz_core: If several parameters are used in a AuthzProviderAlias
     directive, if these parameters are not enclosed in quotation mark, only
     the first one is handled. The other ones are silently ignored.
     Add a message to warn about such a spurious configuration.
     PR 62469 [Hank Ibell <hwibell gmail.com>, Christophe Jaillet]

  *) mod_md: improvements and bugfixes
     - MDNotifyCmd now takes additional parameter that are passed on to the called command.
     - ACME challenges have better checks for interference with other modules
     - ACME challenges are only handled for domains managed by the module, allowing
       other ACME clients to operate for other domains in the server.
     - better libressl integration

  *) mod_proxy_wstunnel: Add default schema ports for 'ws' and 'wss'.
     PR 62480. [Lubos Uhliarik <luhliari redhat.com>}

  *) logging: Some early logging-related startup messages could be lost
     when using syslog for the global ErrorLog. [Eric Covener]

  *) mod_cache: Handle case of an invalid Expires header value RFC compliant
     like the case of an Expires time in the past: allow to overwrite the
     non-caching decision using CacheStoreExpired and respect Cache-Control
     "max-age" and "s-maxage".  [Rainer Jung]

  *) mod_xml2enc: Fix forwarding of error metadata/responses. PR 62180.
     [Micha Lenk <micha lenk.info>, Yann Ylavic]

  *) mod_proxy_http: Fix response header thrown away after the previous one
     was considered too large and truncated. PR 62196. [Yann Ylavic]

  *) core: Add and handle AP_GETLINE_NOSPC_EOL flag for ap_getline() family
     of functions to consume the end of line when the buffer is exhausted.
     PR 62198. [Yann Ylavic]

  *) mod_proxy_http: Add new worker parameter 'responsefieldsize' to
     allow maximum HTTP response header size to be increased past 8192
     bytes.  PR 62199.  [Hank Ibell <hwibell gmail.com>]

  *) mod_ssl: Extend SSLOCSPEnable with mode 'leaf' that only checks the leaf
     of a certificate chain.  PR62112.
     [Ricardo Martin Camarero <rickyepoderi yahoo.es>]

  *) http: Fix small memory leak per request when handling persistent
     connections.  [Ruediger Pluem, Joe Orton]

  *) mod_proxy_html: Fix variable interpolation and memory allocation failure
     in ProxyHTMLURLMap.  PR 62344.  [Ewald Dieterich <ewald mailbox.org>]

  *) mod_remoteip: Fix RemoteIP{Trusted,Internal}ProxyList loading broken by 2.4.30.
     PR 62220.  [Chritophe Jaillet, Yann Ylavic]

  *) mod_remoteip: When overriding the useragent address from X-Forwarded-For,
     zero out what had been initialized as the connection-level port.  PR59931.
     [Hank Ibell <hwibell gmail.com>]

  *) core: In ONE_PROCESS/debug mode, cleanup everything when exiting.
     [Yann Ylavic]

  *) mod_proxy_balancer: Add hot spare member type and corresponding flag (R).
     Hot spare members are used as drop-in replacements for unusable workers
     in the same load balancer set. This differs from hot standbys which are
     only used when all workers in a set are unusable. PR 61140. [Jim Riggs]

  *) suexec: Add --enable-suexec-capabilites support on Linux, to use
     setuid/setgid capability bits rather than a setuid root binary.
     [Joe Orton]

  *) suexec: Add support for logging to syslog as an alternative to
     logging to a file; use --without-suexec-logfile --with-suexec-syslog.
     [Joe Orton]

  *) mod_ssl: Restore 2.4.29 behaviour in SSL vhost merging/enabling
     which broke some rare but previously-working configs.  [Joe Orton]

  *) core, log: improve sanity checks for the ErrorLog's syslog config, and
     explicitly allow only lowercase 'syslog' settings. PR 62102
     [Luca Toscano, Jim Riggs, Christophe Jaillet]

  *) mod_http2: accurate reporting of h2 data input/output per request via
     mod_logio. Fixes an issue where output sizes where counted n-times on
     reused slave connections.  [Stefan Eissing]
     See github issue: https://github.com/icing/mod_h2/issues/158

  *) mod_http2: Fix unnecessary timeout waits in case streams are aborted.
     [Stefan Eissing]

  *) mod_http2: restoring the v1.10.16 keepalive timeout behaviour of mod_http2.
     [Stefan Eissing]

  *) mod_proxy: Do not restrict the maximum pool size for backend connections
     any longer by the maximum number of threads per process and use a better
     default if mod_http2 is loaded.
     [Yann Ylavic, Ruediger Pluem, Stefan Eissing, Gregg Smith]

  *) mod_slotmem_shm: Add generation number to shm filename to fix races
     with graceful restarts. PRs 62044 and 62308.  [Jim Jagielski, Yann Ylavic]

  *) core: Preserve the original HTTP request method in the '%<m' LogFormat
     when an path-based ErrorDocument is used.  PR 62186.
     [Micha Lenk <micha lenk.info>]

  *) mod_remoteip: make proxy-protocol work on slave connections, e.g. in
     HTTP/2 requests.  [Stefan Eissing]
     See also https://github.com/roadrunner2/mod-proxy-protocol/issues/6

  *) mod_ssl: Fix merging of proxy SSL context outside <Proxy> sections,
     regression introduced in 2.4.30. PR 62232. [Rainer Jung, Yann Ylavic]

  *) mod_md: Fix compilation with OpenSSL before version 1.0.2.  [Rainer Jung]

  *) mod_dumpio: do nothing below log level TRACE7.  [Yann Ylavic]

  *) mod_remoteip: Restore compatibility with APR 1.4 (apr_sockaddr_is_wildcard).
     [Eric Covener]

  *) core: On ECBDIC platforms, some errors related to oversized headers
     may be misreported or be logged as ASCII escapes.  PR 62200
     [Hank Ibell <hwibell gmail.com>]

  *) mod_ssl: Fix cmake-based build.  PR 62266.  [Rainer Jung]

  *) core: Add <IfFile>, <IfDirective> and <IfSection> conditional
     section containers.  [Eric Covener, Joe Orton]

  *) rotatelogs: Add -D option to create parent directories.  PR 46669.
     [Philippe Lantin <plantin cobaltgroup.com>, Ben Reser, Rainer Jung]

Changes with Apache 2.4.33

  *) core: Fix request timeout logging and possible crash for error_log hooks.
     [Yann Ylavic]

  *) mod_slomem_shm: Fix failure to create balancers's slotmems in Windows MPM,
     where children processes need to attach them instead since they are owned
     by the parent process already.  [Yann Ylavic]

  *) ab: try all destination socket addresses returned by
     apr_sockaddr_info_get instead of failing on first one when not available.
     Needed for instance if localhost resolves to both ::1 and 127.0.0.1
     e.g. if both are in /etc/hosts.  [Jan Kaluza]

  *) ab: Use only one connection to determine working destination socket
     address.  [Jan Kaluza]

  *) ab: LibreSSL doesn't have or require Windows applink.c.  [Gregg L. Smith]

  *) htpasswd/htdigest: Disable support for bcrypt on EBCDIC platforms.
     apr-util's bcrypt implementation doesn't tolerate EBCDIC.  [Eric Covener]

  *) htpasswd/htdbm: report the right limit when get_password() overflows.
     [Yann Ylavic]

  *) htpasswd: Don't fail in -v mode if password file is unwritable.
     PR 61631.  [Joe Orton]

  *) htpasswd: don't point to (unused) stack memory on output
     to make static analysers happy.  PR 60634.
     [Yann Ylavic, reported by shqking and Zhenwei Zou]

Changes with Apache 2.4.32

  *) mod_access_compat: Fail if a comment is found in an Allow or Deny
     directive.  [Jan Kaluza]

  *) mod_authz_host: Ignore comments after "Require host", logging a
     warning, or logging an error if the line is otherwise empty.
     [Jan Kaluza, Joe Orton]

  *) rotatelogs: Fix expansion of %Z in localtime (-l) mode, and fix
     Y2K38 bug.  [Joe Orton]

  *) mod_ssl: Support SSL DN raw variable extraction without conversion
     to UTF-8, using _RAW suffix on variable names.  [Joe Orton]

  *) ab: Fix https:// connection failures (regression in 2.4.30); fix
     crash generating CSV output for large -n.  [Joe Orton, Jan Kaluza]

Changes with Apache 2.4.31 (not released)

  *) mod_proxy_fcgi: Add the support for mod_proxy's flushpackets and flushwait
     parameters. [Luca Toscano, Ruediger Pluem, Yann Ylavic]

  *) mod_ldap: Avoid possible crashes, hangs, and busy loops due to
     improper merging of the cache lock in vhost config.
     PR 43164 [Eric Covener]

  *) mpm_event: Do lingering close in worker(s).  [Yann Ylavic]

  *) mpm_queue: Put fdqueue code in common for MPMs event and worker.
     [Yann Ylavic]

Changes with Apache 2.4.30 (not released)

  *) SECURITY: CVE-2017-15710 (cve.mitre.org)
     Out of bound write in mod_authnz_ldap with AuthLDAPCharsetConfig enabled
     [Eric Covener, Luca Toscano, Yann Ylavic]

  *) SECURITY: CVE-2018-1283 (cve.mitre.org)
     mod_session: CGI-like applications that intend to read from mod_session's
     'SessionEnv ON' could be fooled into reading user-supplied data instead.
     [Yann Ylavic]

  *) SECURITY: CVE-2018-1303 (cve.mitre.org)
     mod_cache_socache: Fix request headers parsing to avoid a possible crash
     with specially crafted input data.  [Ruediger Pluem]

  *) SECURITY: CVE-2018-1301 (cve.mitre.org)
     core: Possible crash with excessively long HTTP request headers.
     Impractical to exploit with a production build and production LogLevel.
     [Yann Ylavic]

  *) SECURITY: CVE-2017-15715 (cve.mitre.org)
     core: Configure the regular expression engine to match '$' to the end of
     the input string only, excluding matching the end of any embedded
     newline characters. Behavior can be changed with new directive
     'RegexDefaultOptions'. [Yann Ylavic]

  *) SECURITY: CVE-2018-1312 (cve.mitre.org)
     mod_auth_digest: Fix generation of nonce values to prevent replay
     attacks across servers using a common Digest domain. This change
     may cause problems if used with round robin load balancers. PR 54637
     [Stefan Fritsch]

  *) SECURITY: CVE-2018-1302 (cve.mitre.org)
     mod_http2: Potential crash w/ mod_http2.
     [Stefan Eissing]

  *) mod_proxy: Provide an RFC1035 compliant version of the hostname in the
     proxy_worker_shared structure. PR62085 [Graham Leggett]

  *) mod_proxy: Worker schemes and hostnames which are too large are no
     longer fatal errors; it is logged and the truncated values are stored.
     [Jim Jagielski]

  *) mod_proxy: Allow setting options to globally defined balancer from
     ProxyPass used in VirtualHost. Balancers are now merged using the new
     merge_balancers method which merges the balancers options.  [Jan Kaluza]

  *) logresolve: Fix incorrect behavior or segfault if -c flag is used
     Fixes: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=823259
     [Stefan Fritsch]

  *) mod_remoteip: Add support for PROXY protocol (code donated by Cloudzilla).
     Add ability for PROXY protocol processing to be optional to donated code.
     See also: http://www.haproxy.org/download/1.5/doc/proxy-protocol.txt
     [Cloudzilla/roadrunner2@GitHub, Jim Jagielski, Daniel Ruggeri]

  *) mod_proxy, mod_ssl: Handle SSLProxy* directives in <Proxy> sections,
     allowing per backend TLS configuration.  [Yann Ylavic]

  *) mod_proxy_uwsgi: Add in UWSGI proxy (sub)module. [Roberto De Ioris,
     Jim Jagielski]

  *) mod_proxy_balancer,mod_slotmem_shm: Rework SHM reuse/deletion to not
     depend on the number of restarts (non-Unix systems) and preserve shared
     names as much as possible on configuration changes for SHMs and persisted
     files.  PR 62044.  [Yann Ylavic, Jim Jagielski]

  *) mod_http2: obsolete code removed, no more events on beam pool destruction,
     discourage content encoders on http2-status response (where they do not work).
     [Stefan Eissing]

  *) mpm_event: Let the listener thread do its maintenance job on resources
     shortage.  PR 61979.  [Yann Ylavic]

  *) mpm_event: Wakeup the listener to re-enable listening sockets.
     [Yann Ylavic]

  *) mod_ssl: The SSLCompression directive will now give an error if used
     with an OpenSSL build which does not support any compression methods.
     [Joe Orton]

  *) mpm_event,worker: Mask signals for threads created by modules in child
     init, so that they don't receive (implicitly) the ones meant for the MPM.
     PR 62009. [Armin Abfalterer <a.abfalterer gmail com>, Yann Ylavic]

  *) mod_md: new experimental, module for managing domains across virtual hosts,
     implementing the Let's Encrypt ACMEv1 protocol to signup and renew
     certificates. Please read the modules documentation for further instructions
     on how to use it. [Stefan Eissing]

  *) mod_proxy_html: skip documents shorter than 4 bytes
     PR 56286 [Micha Lenk <micha lenk info>]

  *) core, mpm_event: Avoid a small memory leak of the scoreboard handle, for
     the lifetime of the connection, each time it is processed by MPM event.
     [Yann Ylavic]

  *) mpm_event: Update scoreboard status for KeepAlive state.  [Yann Ylavic]

  *) mod_ldap: Fix a case where a full LDAP cache would continually fail to
     purge old entries and log AH01323. PR61891.
     [Hendrik Harms <hendrik.harms gmail.com>]

  *) mpm_event: close connections not reported as handled by any module to
     avoid losing track of them and leaking scoreboard entries.  PR 61551.
     [Yann Ylavic]

  *) core: A signal received while stopping could have crashed the main
     process.  PR 61558.  [Yann Ylavic]

  *) mod_ssl: support for mod_md added. [Stefan Eissing]

  *) mod_proxy_html: process parsed comments immediately.
     Fixes bug (seen in the wild when used with IBM's HTTPD bundle)
     where parsed comments may be lost. [Nick Kew]

  *) mod_proxy_html: introduce doctype for HTML 5 [Nick Kew]

  *) mod_proxy_html: fix typo-bug processing "strict" vs "transitional"
     HTML/XHTML.  PR 56457  [Nick Kew]

  *) mpm_event: avoid a very unlikely race condition between the listener and
     the workers when the latter fails to add a connection to the pollset.
     [Yann Ylavic]

  *) core: silently ignore a not existent file path when IncludeOptional
     is used. PR 57585. [Alberto Murillo Silva <powerbsd yahoo.com>, Luca Toscano]

  *) mod_macro: fix usability of globally defined macros in .htaccess files.
     PR 57525.  [Jose Kahan <jose w3.org>, Yann Ylavic]

  *) mod_rewrite, core: add the Vary header when a condition evaluates to true
     and the related RewriteRule is used in a Directory context
     (triggering an internal redirect). [Luca Toscano]

  *) ab: Make the TLS layer aware that the underlying socket is nonblocking,
     and use/handle POLLOUT where needed to avoid busy IOs and recover write
     errors when appropriate.  [Yann Ylavic]

  *) ab: Keep reading nonblocking to exhaust TCP or SSL buffers when previous
     read was incomplete (the SSL case can cause the next poll() to timeout
     since data are buffered already).  PR 61301 [Luca Toscano, Yann Ylavic]

  *) mod_http2: avoid unnecessary data retrieval for a trace log. Allow certain
     information retrievals on null bucket beams where it makes sense. [Stefan Eissing]

Changes with Apache 2.4.29

  *) mod_unique_id: Use output of the PRNG rather than IP address and
     pid, avoiding sleep() call and possible DNS issues at startup,
     plus improving randomness for IPv6-only hosts.  [Jan Kaluza]

  *) mod_rewrite, core: Avoid the 'Vary: Host' response header when HTTP_HOST
     is used in a condition that evaluates to true. PR 58231 [Luca Toscano, Yann Ylavic]

  *) mod_http2: v0.10.12, removed optimization for mutex handling in bucket
     beams that could lead to assertion failure in edge cases.
     [Stefan Eissing]

  *) mod_proxy: Fix regression for non decimal loadfactor parameter introduced
     in 2.4.28.  [Jim Jagielski]

  *) mod_authz_dbd: fix a segmentation fault if AuthzDBDQuery is not set.
     PR 61546.  [Lubos Uhliarik <luhliari redhat.com>]

  *) mod_rewrite: Add support for starting External Rewriting Programs
     as non-root user on UNIX systems by specifying username and group
     name as third argument of RewriteMap directive.  [Jan Kaluza]

  *) core: Rewrite the Content-Length filter to avoid excessive memory
     consumption. Chunked responses will be generated in more cases
     than in previous releases.  PR 61222.  [Joe Orton, Ruediger Pluem]

  *) mod_ssl: Fix SessionTicket callback return value, which does seem to
     matter with OpenSSL 1.1. [Yann Ylavic]

Changes with Apache 2.4.28

  *) SECURITY: CVE-2017-9798 (cve.mitre.org)
     Corrupted or freed memory access. <Limit[Except]> must now be used in the
     main configuration file (httpd.conf) to register HTTP methods before the
     .htaccess files.  [Yann Ylavic]

  *) event: Avoid possible blocking in the listener thread when shutting down
     connections. PR 60956.  [Yann Ylavic]

  *) mod_speling: Don't embed referer data in a link in error page.
     PR 38923 [Nick Kew]

  *) htdigest: prevent a buffer overflow when a string exceeds the allowed max
     length in a password file. PR 61511.
     [Luca Toscano, Hanno Böck <hanno hboeck de>]

  *) mod_proxy: loadfactor parameter can now be a decimal number (eg: 1.25).
     [Jim Jagielski]

  *) mod_proxy_wstunnel: Allow upgrade to any protocol dynamically.
     PR 61142.

  *) mod_watchdog/mod_proxy_hcheck: Time intervals can now be specified
     down to the millisecond. Supports 'mi' (minute), 'ms' (millisecond),
     's' (second) and 'hr' (hour!) time suffixes. [Jim Jagielski]

  *) mod_http2: Fix for stalling when more than 32KB are written to a
     suspended stream.  [Stefan Eissing]

  *) build: allow configuration without APR sources.  [Jacob Champion]

  *) mod_ssl, ab: Fix compatibility with LibreSSL.  PR 61184.
     [Bernard Spil <brnrd freebsd.org>, Michael Schlenker <msc contact.de>,
      Yann Ylavic]

  *) core/log: Support use of optional "tag" in syslog entries.
     PR 60525. [Ben Rubson <ben.rubson gmail.com>, Jim Jagielski]

  *) mod_proxy: Fix ProxyAddHeaders merging.  [Joe Orton]

  *) core: Disallow multiple Listen on the same IP:port when listener buckets
     are configured (ListenCoresBucketsRatio > 0), consistently with the single
     bucket case (default), thus avoiding the leak of the corresponding socket
     descriptors on graceful restart.  [Yann Ylavic]

  *) event: Avoid listener periodic wake ups by using the pollset wake-ability
     when available.  PR 57399.  [Yann Ylavic, Luca Toscano]

  *) mod_proxy_wstunnel: Fix detection of unresponded request which could have
     led to spurious HTTP 502 error messages sent on upgrade connections.
     PR 61283.  [Yann Ylavic]

Changes with Apache 2.4.27

  *) SECURITY: CVE-2017-9789 (cve.mitre.org)
     mod_http2: Read after free. When under stress, closing many connections,
     the HTTP/2 handling code would sometimes access memory after it has been
     freed, resulting in potentially erratic behaviour.
     [Stefan Eissing]

  *) SECURITY: CVE-2017-9788 (cve.mitre.org)
     mod_auth_digest: Uninitialized memory reflection.  The value placeholder
     in [Proxy-]Authorization headers type 'Digest' was not initialized or
     reset before or between successive key=value assignments.
     [William Rowe]

  *) COMPATIBILITY: mod_lua: Remove the undocumented exported 'apr_table'
     global variable when using Lua 5.2 or later. This was exported as a
     side effect from luaL_register, which is no longer supported as of
     Lua 5.2 which deprecates pollution of the global namespace.
     [Rainer Jung]

  *) COMPATIBILITY: mod_http2: Disable and give warning when using Prefork.
     The server will continue to run, but HTTP/2 will no longer be negotiated.
     [Stefan Eissing]

  *) COMPATIBILITY: mod_proxy_fcgi: Revert to 2.4.20 FCGI behavior for the
     default ProxyFCGIBackendType, fixing a regression with PHP-FPM. PR 61202.
     [Jacob Champion, Jim Jagielski]

  *) mod_lua: Improve compatibility with Lua 5.1, 5.2 and 5.3.
     PR58188, PR60831, PR61245. [Rainer Jung]

  *) mod_http2: Simplify ready queue, less memory and better performance. Update
     mod_http2 version to 1.10.7. [Stefan Eissing]

  *) Allow single-char field names inadvertently disallowed in 2.4.25.
     PR 61220. [Yann Ylavic]

  *) htpasswd / htdigest: Do not apply the strict permissions of the temporary
     passwd file to a possibly existing passwd file. PR 61240. [Ruediger Pluem]

  *) core: Avoid duplicate HEAD in Allow header.
     This is a regression in 2.4.24 (unreleased), 2.4.25 and 2.4.26.
     PR 61207. [Christophe Jaillet]

Changes with Apache 2.4.26

  *) SECURITY: CVE-2017-7679 (cve.mitre.org)
     mod_mime can read one byte past the end of a buffer when sending a
     malicious Content-Type response header.  [Yann Ylavic]

  *) SECURITY: CVE-2017-7668 (cve.mitre.org)
     The HTTP strict parsing changes added in 2.2.32 and 2.4.24 introduced a
     bug in token list parsing, which allows ap_find_token() to search past
     the end of its input string. By maliciously crafting a sequence of
     request headers, an attacker may be able to cause a segmentation fault,
     or to force ap_find_token() to return an incorrect value.
     [Jacob Champion]

  *) SECURITY: CVE-2017-7659 (cve.mitre.org)
     A maliciously constructed HTTP/2 request could cause mod_http2 to
     dereference a NULL pointer and crash the server process.

  *) SECURITY: CVE-2017-3169 (cve.mitre.org)
     mod_ssl may dereference a NULL pointer when third-party modules call
     ap_hook_process_connection() during an HTTP request to an HTTPS port.
     [Yann Ylavic]

  *) SECURITY: CVE-2017-3167 (cve.mitre.org)
     Use of the ap_get_basic_auth_pw() by third-party modules outside of the
     authentication phase may lead to authentication requirements being
     bypassed.
     [Emmanuel Dreyfus <manu netbsd.org>, Jacob Champion, Eric Covener]

  *) HTTP/2 support no longer tagged as "experimental" but is instead considered
     fully production ready.

  *) mod_http2: Fix for possible CPU busy loop introduced in v1.10.3 where a stream may keep
     the session in continuous check for state changes that never happen.
     [Stefan Eissing]

  *) mod_proxy_wstunnel: Add "upgrade" parameter to allow upgrade to other
     protocols.  [Jean-Frederic Clere]

  *) MPMs unix: Place signals handlers and helpers out of DSOs to avoid
     a possible crash if a signal is caught during (graceful) restart.
     PR 60487.  [Yann Ylavic]

  *) mod_rewrite: When a substitution is a fully qualified URL, and the
     scheme/host/port matches the current virtual host, stop interpreting the
     path component as a local path just because the first component of the
     path exists in the filesystem.  Adds RewriteOption "LegacyPrefixDocRoot"
     to revert to previous behavior. PR60009.
     [Hank Ibell <hwibell gmail.com>]

  *) core: ap_parse_form_data() URL-decoding doesn't work on EBCDIC
     platforms. PR61124. [Hank Ibell <hwibell gmail.com>]

  *) ab: enable option processing for setting a custom HTTP method also for
     non-SSL builds.  [Rainer Jung]

  *) core: EBCDIC fixes for interim responses with additional headers.
     [Eric Covener]

  *) mod_env: when processing a 'SetEnv' directive, warn if the environment
     variable name includes a '='. It is likely a configuration error.
     PR 60249 [Christophe Jaillet]

  *) Evaluate nested If/ElseIf/Else configuration blocks.
     [Luca Toscano, Jacob Champion]

  *) mod_rewrite: Add 'BNP' (backreferences-no-plus) flag to RewriteRule to
     allow spaces in backreferences to be encoded as %20 instead of '+'.
     [Eric Covener]

  *) mod_rewrite: Add the possibility to limit the escaping to specific
     characters in backreferences by listing them in the B flag.
     [Eric Covener]

  *) mod_substitute: Fix spurious AH01328 (Line too long) errors on EBCDIC
     systems.  [Eric Covener]

  *) mod_http2: fail requests without ERROR log in case we need to read interim
     responses and see only garbage. This can happen if proxied servers send
     data where none should be, e.g. a body for a HEAD request. [Stefan Eissing]

  *) mod_proxy_http2: adding support for Reverse Proxy Request headers.
     [Stefan Eissing]

  *) mod_http2: fixed possible deadlock that could occur when connections were
     terminated early with ongoing streams. Fixed possible hanger with timeout
     on race when connection considers itself idle. [Stefan Eissing]

  *) mod_http2: MaxKeepAliveRequests now limits the number of times a
     slave connection gets reused. [Stefan Eissing]

  *) mod_brotli: Add a new module for dynamic Brotli (RFC 7932) compression.
     [Evgeny Kotkov]

  *) mod_proxy_http2: Fixed bug in re-attempting proxy requests after
     connection error. Reliability of reconnect handling improved.
     [Stefan Eissing]

  *) mod_http2: better performance, eliminated need for nested locks and
     thread privates. Moving request setups from the main connection to the
     worker threads. Increase number of spare connections kept.
     [Stefan Eissing]

  *) mod_http2: input buffering and dynamic flow windows for increased
     throughput. Requires nghttp2 >= v1.5.0 features. Announced at startup
     in mod_http2 INFO log as feature 'DWINS'. [Stefan Eissing]

  *) mod_http2: h2 workers with improved scalability for better scheduling
     performance. There are H2MaxWorkers threads created at start and the
     number is kept constant for now. [Stefan Eissing]

  *) mod_http2: obsoleted option H2SessionExtraFiles, will be ignored and
     just log a warning. [Stefan Eissing]

  *) mod_autoindex: Add IndexOptions UseOldDateFormat to allow the date
     format from 2.2 in the Last Modified column. PR60846.
     [Hank Ibell <hwibell gmail.com>]

  *) core: Add %{REMOTE_PORT} to the expression parser. PR59938
     [Hank Ibell <hwibell gmail.com>]

  *) mod_cache: Fix a regression in 2.4.25 for the forward proxy case by
     computing and using the same entity key according to when the cache
     checks, loads and saves the request.
     PR 60577.  [Yann Ylavic]

  *) mod_proxy_hcheck: Don't validate timed out responses.  [Yann Ylavic]

  *) mod_proxy_hcheck: Ensure thread-safety when concurrent healthchecks are
     in use (ProxyHCTPsize > 0).  PR 60071.  [Yann Ylavic, Jim Jagielski]

  *) core: %{DOCUMENT_URI} used in nested SSI expressions should point to the
     URI originally requested by the user, not the nested documents URI. This
     restores the behavior of this variable to match the "legacy" SSI parser.
     PR60624. [Hank Ibell <hwibell gmail.com>]

  *) mod_proxy_fcgi: Add ProxyFCGISetEnvIf to fixup CGI environment
     variables just before invoking the FastCGI. [Eric Covener,
     Jacob Champion]

  *) mod_proxy_fcgi: Return to 2.4.20-and-earlier behavior of leaving
     a "proxy:fcgi://" prefix in the SCRIPT_FILENAME environment variable by
     default.  Add ProxyFCGIBackendType to allow the type of backend to be
     specified so these kinds of fixups can be restored without impacting
     FPM. PR60576 [Eric Covener, Jim Jagielski]

  *) mod_ssl: work around leaks on (graceful) restart. [Yann Ylavic]

  *) mod_ssl: Add support for OpenSSL 1.1.0. [Rainer Jung]

  *) Don't set SO_REUSEPORT unless ListenCoresBucketsRatio is greater
     than zero.  [Eric Covener]

  *) mod_http2: moving session cleanup to pre_close hook to avoid races with
     modules already shut down and slave connections still operating.
     [Stefan Eissing]

  *) mod_lua: Support for Lua 5.3

  *) mod_proxy_http2: support for ProxyPreserverHost directive. [Stefan Eissing]

  *) mod_http2: fix for crash when running out of memory.
     [Robert Swiecki <robert swiecki.net>, Stefan Eissing]

  *) mod_proxy_fcgi: Return HTTP 504 rather than 503 in case of proxy timeout.
     [Luca Toscano]

  *) mod_http2: not counting file buckets again stream max buffer limits.
     Effectively transferring static files in one step from slave to master
     connection. [Stefan Eissing]

  *) mod_http2: comforting ap_check_pipeline() on slave connections
     to facilitate reuse (see https://github.com/icing/mod_h2/issues/128).
     [Stefan Eissing, reported by Armin Abfalterer]

  *) mod_http2: http/2 streams now with state handling/transitions as defined
     in RFC7540. Stream cleanup/connection shutdown reworked to become easier
     to understand/maintain/debug. Added many asserts on state and cleanup
     transitions. [Stefan Eissing]

  *) mod_auth_digest: Use an anonymous shared memory segment by default,
     preventing startup failure after unclean shutdown.  PR 54622.
     [Jan Kaluza]

  *) mod_filter: Fix AddOutputFilterByType with non-content-level filters.
     PR 58856. [Micha Lenk <micha lenk.info>]

  *) mod_watchdog: Fix semaphore leak over restarts.  [Jim Jagielski]

  *) mod_http2: regression fix on PR 59348, on graceful restart, ongoing
     streams are finished normally before the final GOAWAY is sent.
     [Stefan Eissing, <slavko gmail.com>]

  *) mod_proxy: Allow the per-request environment variable "no-proxy" to
     be used as an alternative to ProxyPass /path !. This is primarily
     to set exceptions for ProxyPass specified in <Location> context.
     Use SetEnvIf, not SetEnv. PR 60458.  [Eric Covener]

  *) mod_http2: fixes PR60599, sending proper response for conditional requests
     answered by mod_cache. [Jeff Wheelhouse, Stefan Eissing]

  *) mod_http2: rework of stream resource cleanup to avoid a crash in a close
     of a lingering connection. Prohibit special file bucket beaming for
     shared buckets. Files sent in stream output now use the stream pool
     as read buffer, reducing memory footprint of connections.
     [Yann Ylavic, Stefan Eissing]

  *) mod_proxy_fcgi, mod_fcgid: Fix crashes in ap_fcgi_encoded_env_len() when
     modules add empty environment variables to the request. PR 60275.
     [<alex2grad AT gmail.com>]

  *) mod_http2: fix for possible page fault when stream is resumed during
     session shutdown. [sidney-j-r-m (github)]

  *) mod_http2: fix for h2 session ignoring new responses while already
     open streams continue to have data available. [Stefan Eissing]

  *) mod_http2: adding support for MergeTrailers directive. [Stefan Eissing]

  *) mod_http2: limiting DATA frame sizes by TLS record sizes in use on the
     connection. Flushing outgoing frames earlier. [Stefan Eissing]

  *) mod_http2: cleanup beamer registry on server reload.  PR 60510.
     [Pavel Mateja <pavel verotel.cz>, Stefan Eissing]

  *) mod_proxy_{ajp,fcgi}: Fix a possible crash when reusing an established
     backend connection, happening with LogLevel trace2 or higher configured,
     or at any log level with compilers not detected as C99 compliant (e.g.
     MSVC on Windows).  [Yann Ylavic]

  *) mod_ext_filter: Don't interfere with "error buckets" issued by other
     modules. PR 60375.  [Eric Covener, Lubos Uhliarik]

  *) mod_http2: fixes https://github.com/icing/mod_h2/issues/126 e.g. beam
     bucket lifetime handling when data is sent over temporary pools.
     [Stefan Eissing]

Changes with Apache 2.4.25

  *) Fix some build issues related to various modules.
     [Rainer Jung]

Changes with Apache 2.4.24 (not released)

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

  *) SECURITY: CVE-2016-2161 (cve.mitre.org)
     mod_auth_digest: Prevent segfaults during client entry allocation when
     the shared memory space is exhausted.
     [Maksim Malyutin <m.malyutin dsec.ru>, Eric Covener, Jacob Champion]

  *) SECURITY: CVE-2016-0736 (cve.mitre.org)
     mod_session_crypto: Authenticate the session data/cookie with a
     MAC (SipHash) to prevent deciphering or tampering with a padding
     oracle attack.  [Yann Ylavic, Colm MacCarthaigh]

  *) SECURITY: CVE-2016-8743 (cve.mitre.org)
     Enforce HTTP request grammar corresponding to RFC7230 for request lines
     and request headers, to prevent response splitting and cache pollution by
     malicious clients or downstream proxies. [William Rowe, Stefan Fritsch]

  *) Validate HTTP response header grammar defined by RFC7230, resulting
     in a 500 error in the event that invalid response header contents are
     detected when serving the response, to avoid response splitting and cache
     pollution by malicious clients, upstream servers or faulty modules.
     [Stefan Fritsch, Eric Covener, Yann Ylavic]

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

  *) mod_rewrite: Limit runaway memory use by short circuiting some kinds of
     looping RewriteRules when the local path significantly exceeds
     LimitRequestLine.  PR 60478. [Jeff Wheelhouse <apache wheelhouse.org>]

  *) mod_ratelimit: Allow for initial "burst" amount at full speed before
     throttling: PR 60145 [Andy Valencia <ajv-etradanalhos vsta.org>,
     Jim Jagielski]

  *) mod_socache_memcache: Provide memcache stats to mod_status.
     [Jim Jagielski]

  *) mod_file_cache: mod_file_cache should be able to serve files that
     haven't had a Content-Type set via e.g. mod_mime. [Eric Covener]

  *) http_filters: Fix potential looping in new check_headers() due to new
     pattern of ap_die() from http header filter. Explicitly clear the
     previous headers and body.

  *) core: Drop Content-Length header and message-body from HTTP 204 responses.
     PR 51350 [Luca Toscano]

  *) mod_proxy: Honor a server scoped ProxyPass exception when ProxyPass is
     configured in <Location>, like in 2.2. PR 60458.
     [Eric Covener]

  *) mod_lua: Fix default value of LuaInherit directive. It should be
     'parent-first' instead of 'none', as per documentation.  PR 60419
     [Christophe Jaillet]

  *) core: New directive HttpProtocolOptions to control httpd enforcement
     of various RFC7230 requirements. [Stefan Fritsch, William Rowe]

  *) core: Permit unencoded ';' characters to appear in proxy requests and
     Location: response headers. Corresponds to modern browser behavior.
     [William Rowe]

  *) core: ap_rgetline_core now pulls from r->proto_input_filters.

  *) core: Correctly parse an IPv6 literal host specification in an absolute
     URL in the request line. [Stefan Fritsch]

  *) core: New directive RegisterHttpMethod for registering non-standard
     HTTP methods. [Stefan Fritsch]

  *) mod_socache_memcache: Pass expiration time through to memcached. PR 55445.
     [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 situations.
     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]

  *) 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]

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

  *) 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]

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

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

  *) 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

  *) 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]

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]

Changes with Apache 2.4.22

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

Changes with Apache 2.4.21

  *) core: Added support for HTTP code 451. PR 58985.
     [Yehuda Katz <yehuda ymkatz.net>, Jim Jagielski]

  *) 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
     o                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       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