CHANGES revision e50c3026198fd496f183cda4c32a202925476778
c28749e97052f09388969427adf7df641cdcdc22kais -*- coding: utf-8 -*-
c28749e97052f09388969427adf7df641cdcdc22kaisChanges with Apache 2.5.0
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) mod_logio: Add LogIOTrackTTFB and %^FB logformat to log the time
bb25c06cca41ca78e5fb87fbb8e81d55beb18c95jg taken to start writing response headers. [Eric Covener]
bb25c06cca41ca78e5fb87fbb8e81d55beb18c95jg
c28749e97052f09388969427adf7df641cdcdc22kais *) http: Add support for RFC2324/RFC7168. [Graham Leggett]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) mod_proxy_wstunnel: Avoid an empty response by failing with 502 (Bad
c28749e97052f09388969427adf7df641cdcdc22kais Gateway) when no response is ever received from the backend.
c28749e97052f09388969427adf7df641cdcdc22kais [Jan Kaluza]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) core: Cleanup the request soon/even if some output filter fails to
c28749e97052f09388969427adf7df641cdcdc22kais handle the EOR bucket. [Yann Ylavic]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) mpm_event: Allow for timer events duplicates. [Jim Jagielski, Yann Ylavic]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) mod_ssl: Fix possible crash when loading server certificate constraints.
c28749e97052f09388969427adf7df641cdcdc22kais PR 57694. [Paul Spangler <paul.spangler ni com>, Yann Ylavic]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) core, modules: Avoid error response/document handling by the core if some
bb25c06cca41ca78e5fb87fbb8e81d55beb18c95jg handler or input filter already did it while reading the request (causing
c28749e97052f09388969427adf7df641cdcdc22kais a double response body). [Yann Ylavic]
c28749e97052f09388969427adf7df641cdcdc22kais
7014882c6a3672fd0e5d60200af8643ae53c5928Richard Lowe *) mod_proxy: Fix a race condition that caused a failed worker to be retried
c28749e97052f09388969427adf7df641cdcdc22kais before the retry period is over. [Ruediger Pluem]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) mod_rewrite: Add support for starting External Rewriting Programs
c28749e97052f09388969427adf7df641cdcdc22kais as non-root user on UNIX systems by specifying username and group name
c28749e97052f09388969427adf7df641cdcdc22kais as third argument of RewriteMap directive. [Jan Kaluza]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) mod_authn_core: Add expression support to AuthName and AuthType.
c28749e97052f09388969427adf7df641cdcdc22kais [Graham Leggett]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) suexec: Filter out the HTTP_PROXY environment variable because it is
c28749e97052f09388969427adf7df641cdcdc22kais treated as alias for http_proxy by some programs. [Stefan Fritsch]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) mod_proxy_http: Use the "Connection: close" header for requests to
c28749e97052f09388969427adf7df641cdcdc22kais backends not recycling connections (disablereuse), including the default
c28749e97052f09388969427adf7df641cdcdc22kais reverse and forward proxies. [Yann Ylavic]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) mod_proxy_http: Don't expect the backend to ack the "Connection: close" to
c28749e97052f09388969427adf7df641cdcdc22kais finally close those not meant to be kept alive by SetEnv proxy-nokeepalive
c28749e97052f09388969427adf7df641cdcdc22kais or force-proxy-request-1.0, and respond with 502 instead of 400 if its
c28749e97052f09388969427adf7df641cdcdc22kais Connection header is invalid. [Yann Ylavic]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) http: Make ap_die() robust against any HTTP error code and not modify
c28749e97052f09388969427adf7df641cdcdc22kais response status (finally logged) when nothing is to be done. [Yann Ylavic]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) mod_proxy_connect/wstunnel: If both client and backend sides get readable
c28749e97052f09388969427adf7df641cdcdc22kais at the same time, don't lose errors occuring while forwarding on the first
c28749e97052f09388969427adf7df641cdcdc22kais side when none occurs next on the other side, and abort. [Yann Ylavic]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) mod_proxy_http: Don't establish or reuse a backend connection before pre-
c28749e97052f09388969427adf7df641cdcdc22kais fetching the request body, so to minimize the delay between it is supposed
c28749e97052f09388969427adf7df641cdcdc22kais to be alive and the first bytes sent: this is a best effort to prevent the
c28749e97052f09388969427adf7df641cdcdc22kais backend from closing because of idle or keepalive timeout in the meantime.
c28749e97052f09388969427adf7df641cdcdc22kais Also, handle a new "proxy-flushall" environment variable which allows to
c28749e97052f09388969427adf7df641cdcdc22kais flush any forwarded body data immediately. PR 56541+37920. [Yann Ylavic]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) core: Define and UnDefine are no longer permitted in
c28749e97052f09388969427adf7df641cdcdc22kais directory context. Previously they would always be evaulated
c28749e97052f09388969427adf7df641cdcdc22kais as the configuration was read without regard for the directory
c28749e97052f09388969427adf7df641cdcdc22kais context. [Eric Covener]
c28749e97052f09388969427adf7df641cdcdc22kais
bb25c06cca41ca78e5fb87fbb8e81d55beb18c95jg *) config: For directives that do not expect any arguments, enforce
bb25c06cca41ca78e5fb87fbb8e81d55beb18c95jg that none are specified in the configuration file.
bb25c06cca41ca78e5fb87fbb8e81d55beb18c95jg [Joachim Zobel <jzobel heute-morgen.de>, Eric Covener]
bb25c06cca41ca78e5fb87fbb8e81d55beb18c95jg
bb25c06cca41ca78e5fb87fbb8e81d55beb18c95jg *) mod_alias: Introduce expression parser support for Alias, ScriptAlias
bb25c06cca41ca78e5fb87fbb8e81d55beb18c95jg and Redirect. [Graham Leggett]
bb25c06cca41ca78e5fb87fbb8e81d55beb18c95jg
bb25c06cca41ca78e5fb87fbb8e81d55beb18c95jg *) mod_rewrite: Improve 'bad flag delimeters' startup error by showing
bb25c06cca41ca78e5fb87fbb8e81d55beb18c95jg how the input was tokenized. PR 56528. [Edward Lu <Chaosed0 gmail.com>]
bb25c06cca41ca78e5fb87fbb8e81d55beb18c95jg
7014882c6a3672fd0e5d60200af8643ae53c5928Richard Lowe *) mod_ssl: Add support for extracting subjectAltName entries of type
7014882c6a3672fd0e5d60200af8643ae53c5928Richard Lowe rfc822Name and dNSName into SSL_{CLIENT,SERVER}_SAN_{Email,DNS}_n
c28749e97052f09388969427adf7df641cdcdc22kais environment variables. Also addresses PR 57207. [Kaspar Brand]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) mod_proxy: Don't put non balancer-member workers in error state by
c28749e97052f09388969427adf7df641cdcdc22kais default for connection or 500/503 errors, and honor status=+I for
c28749e97052f09388969427adf7df641cdcdc22kais any error. PR 48388. [Yann Ylavic]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) mod_socache_memcache: Pass expiration time through to memcached. PR 55445.
c28749e97052f09388969427adf7df641cdcdc22kais [Faidon Liambotis <paravoid debian.org>, Joe Orton]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) mod_http: Fix incorrect If-Match handling. PR 57358.
c28749e97052f09388969427adf7df641cdcdc22kais [Kunihiko Sakamoto <ksakamoto google.com>]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) mod_proxy_ajp: Fix client connection errors handling and logged status
c28749e97052f09388969427adf7df641cdcdc22kais when it occurs. PR 56823. [Yann Ylavic]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) ap_expr: Add filemod function for checking file modification dates
c28749e97052f09388969427adf7df641cdcdc22kais [Daniel Gruno]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) core: Add CGIPassAuth directive to control whether HTTP authorization
c28749e97052f09388969427adf7df641cdcdc22kais headers are passed to scripts as CGI variables. PR 56855. [Jeff
c28749e97052f09388969427adf7df641cdcdc22kais Trawick]
c28749e97052f09388969427adf7df641cdcdc22kais
c28749e97052f09388969427adf7df641cdcdc22kais *) mod_authnz_ldap: Resolve crashes with LDAP authz and non-LDAP authn since
c28749e97052f09388969427adf7df641cdcdc22kais r1608202. [Eric Covener]
c28749e97052f09388969427adf7df641cdcdc22kais
*) mod_buffer: Forward flushed input data immediatly and avoid (unlikely)
access to freed memory. [Yann Ylavic, Christophe Jaillet]
*) mod_proxy: Use the correct server name for SNI in case the backend
SSL connection itself is established via a proxy server.
PR 57139 [Szabolcs Gyurko <szabolcs gyurko.org>]
*) core: Ensure that httpd exits with an error status when the MPM fails
to run. [Yann Ylavic]
*) apreq: Content-Length header should be always interpreted as a decimal.
Leading 0 could be erroneously considered as an octal value. PR 56598.
[Chris Card <ctcard hotmail com>]
*) mod_proxy: Now allow for 191 character worker names, with non-fatal
errors if name is truncated. PR53218. [Jim Jagielski]
*) mod_ssl: Add optional function "ssl_get_tls_cb" to allow support
for channel bindings. [Simo Sorce <simo redhat.com>]
*) mod_proxy_wstunnel: Concurrent websockets messages could be
lost or delayed with ProxyWebsocketAsync enabled.
[Edward Lu <Chaosed0 gmail.com>]
*) core, mod_info: Add compiled and loaded PCRE versions to version
number display. [Rainer Jung]
*) mpm_winnt: Accept utf-8 (Unicode) service names and descriptions for
internationalization. [William Rowe]
*) mpm_winnt: Normalize the error and status messages emitted by service.c,
the service control interface for Windows. [William Rowe]
*) mod_authnz_ldap: Return LDAP connections to the pool before the handler
is run, instead of waiting until the end of the request. [Eric Covener]
*) mod_log_config: Add GlobalLog to allow a globally defined log to
be inherited by virtual hosts that define a CustomLog.
[Edward Lu <Chaosed0 gmail.com>]
*) MPMs: Support SO_REUSEPORT to create multiple duplicated listener
records for scalability. [Yingqi Lu <yingqi.lu@intel.com>,
Jeff Trawick, Jim Jagielski]
*) mod_proxy_html: support automatic detection of doctype and processing
of FPIs. PR56285 [Micha Lenk <micha lenk info>, Nick Kew]
*) mod_proxy_html: skip documents shorter than 4 bytes
PR 56286 [Micha Lenk <micha lenk info>]
*) mod_proxy_fdpass: Fix computation of the size of 'struct sockaddr_un'
when passed to 'connect()'.
[Graham Dumpleton <grahamd apache org>]
*) core: Add ap_mpm_resume_suspended() API to allow a suspended connection
to resume. PR56333
[Artem <artemciy gmail.com>, Edward Lu <Chaosed0 gmail.com>]
*) core: Add ap_mpm_register_socket_callback_timeout() API. [Eric Covener]
*) mod_proxy_wstunnel: Honor ProxyWebsocketIdleTimeout in asynchronous
processing mode. [Eric Covener]
*) mod_authnz_ldap: Fail explicitly when the filter is too long. Remove
unnecessary apr_pstrdup() and strlen(). [Graham Leggett]
*) Add the ldap-search option to mod_authnz_ldap, allowing authorization
to be based on arbitrary expressions that do not include the username.
[Graham Leggett]
*) 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]
*) Add module mod_ssl_ct, which provides an implementation of Certificate
Transparency (RFC 6962) for httpd. [Jeff Trawick]
*) mod_remoteip: Prevent an external proxy from presenting an internal
proxy. PR 55962. [Mike Rumph]
*) mod_ssl: Add hooks to allow other modules to perform processing at
several stages of initialization and connection handling. See
mod_ssl_openssl.h. [Jeff Trawick]
*) mod_proxy_wstunnel: Avoid sending error responses down an upgraded
websockets connection as it is being close down. [Eric Covener]
*) mod_proxy_wstunnel: Allow the administrator to cap the amount
of time a synchronous websockets connection stays idle with
ProxyWebsocketIdleTimeout. [Eric Covener]
*) mod_proxy_wstunnel: Change to opt-in for asynchronous support, adding
directives ProxyWebsocketAsync and ProxyWebsocketAsyncDelay.
[Eric Covener]
*) mod_proxy_wstunnel: Stop leaking websockets backend connections under
event MPM (trunk-only). [Eric Covener]
*) mod_proxy_http: Add detach_backend hook (potentially usable
in other proxy scheme handlers). [Jeff Trawick]
*) 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]
*) mod_rewrite: Add 'BNF' (backreferences-no-plus) flag to RewriteRule to
allow spaces in backreferences to be encoded as %20 instead of '+'.
[Eric Covener]
*) mod_rewrite: Support an optional list of characters to escape in the
argument for the 'B' (escape backreferences) flag. [Eric Covener]
*) mod_dir: Default to 2.2-like behavior and skip execution when method is
neither GET nor POST, such as for DAV requests. PR 54914. [Chris Darroch]
*) mod_rewrite: Rename the handler that does per-directory internal
redirects to "rewrite-redirect-handler" from "redirect-handler" so
it is less ambiguous and less likely to be reused. [Eric Covener]
*) mod_rewrite: Protect against looping with the [N] flag by enforcing a
default limit of 10000 iterations, and allowing each rule to change its
limit. [Eric Covener]
*) mod_ssl: Fix config merging of SSLOCSPEnable and SSLOCSPOverrideResponder.
[Jeff Trawick]
*) Add HttpContentLengthHeadZero and HttpExpectStrict directives.
[Yehuda Sadeh <yehuda inktank com>, Justin Erenkrantz]
*) mod_ssl: Add -t -DDUMP_CA_CERTS option which dumps the filenames of all
configured SSL CA certificates to stdout the same way as DUMP_CERTS does.
[Jan Kaluza]
*) mod_ssl: Don't flush when an EOS is received. Prepares mod_ssl
to support write completion. [Graham Leggett]
*) core: Add parse_errorlog_arg callback to ap_errorlog_provider
to allow providers to check the ErrorLog argument. [Jan Kaluza]
*) mod_cgid: Use the servers Timeout for each read from a CGI script,
allow override with new CGIDRequestTimeout directive. PR43494
[Eric Covener, Toshikuni Fukaya <toshikuni-fukaya cybozu co jp>]
*) core: ensure any abnormal exit is reported to stderr if it's a tty.
PR 55670 [Nick Kew]
*) mod_lua: Let the Inter-VM get/set functions work with a global
shared memory pool instead of a per-process pool. [Daniel Gruno]
*) ldap: Support ldaps when using the Microsoft LDAP SDK.
PR 54626. [Jean-Frederic Clere]
*) mod_proxy: Add ap_connection_reusable() for checking if a connection
is reusable as of this point in processing. [Jeff Trawick]
*) mod_authnz_ldap: Change default value of AuthLDAPMaxSubGroupDepth to 0
to avoid performance problems when subgroups aren't in use. [Eric Covener]
*) mod_syslog: New module implementing syslog ap_error_log provider.
Previously, this code was part of core, now it's in separate module.
[Jan Kaluza]
*) core: Add ap_errorlog_provider to make ErrorLog logging modular. Move
syslog support from core to new mod_syslog. [Jan Kaluza]
*) mod_status, mod_echo: Fix the display of client addresses.
They were truncated to 31 characters which is not enough for IPv6 addresses.
PR 54848 [Bernhard Schmidt <berni birkenwald de>]
*) core: Add ap_log_data(), ap_log_rdata(), etc. for logging buffers.
[Jeff Trawick]
*) 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 <jkaluza redhat.com>]
*) mod_authnz_ldap: Support primitive LDAP servers that do not accept
filters, such as "SDBM-backed LDAP" on z/OS, by allowing a special
filter "none" to be specified in AuthLDAPURL. [Eric Covener]
*) 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]
*) core: merge AllowEncodedSlashes from the base configuration into
virtual hosts. [Eric Covener]
*) AIX: Install DSO's with "cp" instead of "install" in instdso.sh
[Eric Covener]
*) mod_ldap: Don't keep retrying if a new LDAP connection times out.
[Eric Covener]
*) mod_deflate: permit compilation of mod_deflate against a zlib that has
been configured with -D Z_PREFIX, which redefines the token "deflate".
[Eric Covener]
*) mod_auth_digest: Use the secret when generating nonces in all cases and
not only when AuthName is used in .htaccess files (this change may cause
problems if used with round robin load balancers). Don't regenerate the
secret on graceful restarts. PR 54637 [Stefan Fritsch]
*) core: Remove apr_brigade_flatten(), buffering and duplicated code
from the HTTP_IN filter, parse chunks in a single pass with zero copy.
Reduce memory usage by 48 bytes per request. [Graham Leggett]
*) core: Stop the HTTP_IN filter from attempting to write error buckets
to the output filters, which is bogus in the proxy case. Create a
clean mapping from APR codes to HTTP status codes, and use it where
needed. [Graham Leggett]
*) mod_proxy: Ensure network errors detected by the proxy are returned as
504 Gateway Timout as opposed to 502 Bad Gateway, in order to be
compliant with RFC2616 14.9.4 Cache Revalidation and Reload Controls.
*) 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_ldap: LDAP connections used for authentication were not respecting
LDAPConnectionPoolTimeout. PR 54587
*) core: ap_rgetline_core now pulls from r->proto_input_filters.
*) mod_proxy_html: process parsed comments immediately.
Fixes bug 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 [Nick Kew]
*) core: Add option to add valgrind support. Use it to reduce false positive
warnings in mod_ssl. [Stefan Fritsch]
*) mod_authn_file, mod_authn_dbd, mod_authn_dbm, mod_authn_socache:
Cache the result of the most recent password hash verification for every
keep-alive connection. This saves some expensive calculations.
[Stefan Fritsch]
*) http: Remove support for Request-Range header sent by Navigator 2-3 and
MSIE 3. [Stefan Fritsch]
*) core, http: Extend HttpProtocol with an option to enforce stricter HTTP
conformance or to only log the found problems. [Stefan Fritsch]
*) core: Correctly parse an IPv6 literal host specification in an absolute
URL in the request line. [Stefan Fritsch]
*) EventOpt MPM
*) core: Add LogLevelOverride directive that allows to override the
loglevel for clients from certain IPs. This also works for things
like the SSL handshake where <If> LogLevel ... </If> is evaluated
too late. [Stefan Fritsch]
*) core: Add new directive Warning to issue warnings from a configuration
file. Both Warning and Error now generate a timestamped log message.
[Fabien Coelho]
*) ap_expr: Add SERVER_PROTOCOL_VERSION, ..._MAJOR, and ..._MINOR
variables. [Stefan Fritsch]
*) core: New directive RegisterHttpMethod for registering non-standard
HTTP methods. [Stefan Fritsch]
*) core: New directive HttpProtocol which allows to disable HTTP/0.9
support. [Stefan Fritsch]
*) mod_allowhandlers: New module to forbid specific handlers for specific
directories. [Stefan Fritsch]
*) mod_systemd: New module, for integration with systemd on Linux.
[Jan Kaluza <jkaluza redhat.com>]
*) WinNT MPM: Store pid and generation for each thread in scoreboard
to allow tracking of threads from exiting children via mod_status
or other such mechanisms. [Jeff Trawick]
*) The following now respect DefaultRuntimeDir/DEFAULT_REL_RUNTIMEDIR:
- APIs: ap_log_pid(), ap_remove_pid, ap_read_pid()
- core: the scoreboard (ScoreBoardFile), pid file (PidFile), and
mutexes (Mutex)
- mod_cache: thundering herd lock directory
- mod_lbmethod_heartbeat, mod_heartmonitor: heartbeat storage file
- mod_ldap: shared memory cache
- mod_socache_shmcb, mod_socache_dbm: shared memory or dbm for cache
[Jeff Trawick]
*) 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; configure --without-suexec-logfile --with-suexec-syslog.
[Joe Orton]
*) mod_ssl: Add support for TLS Next Protocol Negotiation. PR 52210.
[Matthew Steele <mdsteele google.com>]
*) cross-compile: allow to provide CC_FOR_BUILD so that gen_test_char will
be compiled by the build compiler instead of the host compiler.
Also set CC_FOR_BUILD to 'cc' when cross-compilation is detected.
PR 51257. [Guenter Knauf]
*) core: In maintainer mode, replace apr_palloc with a version that
initializes the allocated memory with non-zero values, except if
AP_DEBUG_NO_ALLOC_POISON is defined. [Stefan Fritsch]
*) mod_policy: Add a new testing module to help server administrators
enforce a configurable level of protocol compliance on their
servers and application servers behind theirs. [Graham Leggett]
*) mod_firehose: Add a new debugging module able to record traffic
passing through the server in such a way that connections and/or
requests be reconstructed and replayed. [Graham Leggett]
*) mod_noloris
*) APREQ
*) Simple MPM
*) mod_serf
[Apache 2.5.0-dev includes those bug fixes and changes with the
Apache 2.4.xx tree as documented below, except as noted.]
Changes with Apache 2.4.x and later:
*) http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/CHANGES?view=markup
Changes with Apache 2.2.x and later:
*) http://svn.apache.org/viewvc/httpd/httpd/branches/2.2.x/CHANGES?view=markup
Changes with Apache 2.0.x and later:
*) http://svn.apache.org/viewvc/httpd/httpd/branches/2.0.x/CHANGES?view=markup