2 Changes with Apache 2.5.0
4 *) mod_cgid: Message 02550, failure to flush a response to the client,
5 is now logged at TRACE1 level to match the underlying core output filter
6 severity. [Eric Covener]
8 *) mod_http2: connection how keep a "push diary" where hashes of already
9 pushed resources are kept. See directive H2PushDiarySize for managing this.
10 Push diaries can be initialized by clients via the "Cache-Digest" request
11 header. This carries a base64url encoded. compressed Golomb set as described
12 in https://datatracker.ietf.org/doc/draft-kazuho-h2-cache-digest/
13 Introduced a status handler for HTTP/2 connections, giving various counters
14 and statistics about the current connection, plus its cache digest value
15 in a JSON record. Not a replacement for more HTTP/2 in the server status.
17 <Location "/http2-status">
18 SetHandler http2-status
22 *) mod_rewrite: Avoid looping on relative substitutions that
23 result in the same filename we started with. PR 58854.
26 *) mime.types: add common extension "m4a" for MPEG 4 Audio.
27 PR 57895 [Dylan Millikin <dylan.millikin gmail.com>]
29 *) mod_http2: async reading for http2 connections disabled for now. Fixed
30 flushing of last GOAWAY frame. Fixed calculation of last stream id
31 accepted as described in rfc7540. Reading in KEEPALIVE state now
32 correctly show in scoreboard. Fixed possible race in connection
33 shutdown after review by Ylavic. [Stefan Eissing]
35 *) mod_ssl: Save some TLS record (application data) fragmentations by
36 including the last and subsequent suitable buckets when coalescing.
39 *) mod_cache_socache: Fix a possible cached entity body corruption when it
40 is received from an origin server in multiple batches and forwarded by
41 mod_proxy. [Yann Ylavic]
43 *) mod_http2: Fixed segfault on connection shutdown, callback ran into a semi
44 dismantled session. Added support for experimental accept-push-policy draft
45 (https://tools.ietf.org/html/draft-ruellan-http-accept-push-policy-00). Clients
46 may now influence server pushes by sending accept-push-policy headers.
49 *) mod_http2: On async MPMs (event), idle HTTP/2 connections will enter KEEPALIVE
50 state and become eligible for MPM cleanup under load. Rewrote connection
51 state handling. Defaults for H2KeepAliveTimeout shortened. Cleaned up logging.
52 Improved scoreboard updates for http2 master threads.
55 *) mod_http2: new r->subprocess_env variables HTTP2 and H2PUSH, set to "on"
56 when available for request.
59 *) mod_http2: adding new config directives and the implementation behind
60 them: H2Timeout, H2KeepAliveTimeout, H2StreamTimeout. Documentation in
64 *) mod_http2: when running in async mpm processing, mod_http2 will cease
65 processing on idle connections (e.g. no open streams) back to the mpm.
68 *) mod_http2: fixed bug in input window size calculation by moving chunked
69 request body encoding into later stage of processing.
72 *) mod_proxy_fdpass: Fix AH01153 error when using the default configuration.
73 In earlier version of httpd, you can explicitelly set the 'flusher' parameter
74 to 'flush' as a workaround. (i.e. flusher=flush)
75 Add documentation for the 'flusher' parameter when defining a proxy worker.
78 *) mod_ssl: For the "SSLStaplingReturnResponderErrors off" case, make sure
79 to only staple responses with certificate status "good". [Kaspar Brand]
81 *) core: Limit to ten the number of tolerated empty lines between request,
82 and consume them before the pipelining check to avoid possible response
83 delay when reading the next request without flushing. [Yann Ylavic]
85 *) mod_session: Introduce SessionExpiryUpdateInterval which allows to
86 configure the session/cookie expiry's update interval. PR 57300.
87 [Paul Spangler <paul.spangler ni.com>]
89 *) core: Extend support for asynchronous write completion from the
90 network filter to any connection or request filter. [Graham Leggett]
92 *) mpm_event: Free memory earlier when shutting down processes.
95 *) mod_ssl: Make the output filter more friendly with deferred write and
96 response pipelining. [Yann Ylavic, Joe Orton]
98 *) core/util_script: relax alphanumeric filter of environment variable names
99 on Windows to allow '(' and ')' for passing PROGRAMFILES(X86) et.al.
100 unadulterated in 64 bit versions of Windows. PR 46751.
101 [John <john leineweb de>]
103 *) mod_auth_digest: remove AuthDigestEnableQueryStringHack which is no
104 more documented since dec 2012 (r1415960). [Christophe Jaillet]
106 *) mod_charset_lite: On EBCDIC platforms, make sure mod_charset_lite runs
107 after other resource-level filters. [Eric Covener]
109 *) mod_dir: Responses that go through "FallbackResource" might appear to
110 hang due to unterminated chunked encoding. PR58292. [Eric Covener]
112 *) mod_alias: Limit Redirect expressions to directory (Location) context
113 and redirect statuses (implicit or explicit).
114 [Yann Ylavic, Ruediger Pluem]
116 *) mod_substitute: Fix configuraton merge order.
117 PR 57641 [<Marc.Stern approach.be>]
119 *) mod_ssl: When SSLVerify is disabled (NONE), don't force a renegotiation if
120 the SSLVerifyDepth applied with the default/handshaken vhost differs from
121 the one applicable with the finally selected vhost. [Yann Ylavic]
123 *) http: Don't remove the Content-Length of zero from a HEAD response if
124 it comes from an origin server, module or script. [Yann Ylavic]
126 *) http: Add support for RFC2324/RFC7168. [Graham Leggett]
128 *) mod_rewrite: Add support for starting External Rewriting Programs
129 as non-root user on UNIX systems by specifying username and group name
130 as third argument of RewriteMap directive. [Jan Kaluza]
132 *) mod_authn_core: Add expression support to AuthName and AuthType.
135 *) suexec: Filter out the HTTP_PROXY environment variable because it is
136 treated as alias for http_proxy by some programs. [Stefan Fritsch]
138 *) mod_proxy_http: Don't establish or reuse a backend connection before pre-
139 fetching the request body, so to minimize the delay between it is supposed
140 to be alive and the first bytes sent: this is a best effort to prevent the
141 backend from closing because of idle or keepalive timeout in the meantime.
142 Also, handle a new "proxy-flushall" environment variable which allows to
143 flush any forwarded body data immediately. PR 56541+37920. [Yann Ylavic]
145 *) core: Define and UnDefine are no longer permitted in
146 directory context. Previously they would always be evaulated
147 as the configuration was read without regard for the directory
148 context. [Eric Covener]
150 *) config: For directives that do not expect any arguments, enforce
151 that none are specified in the configuration file.
152 [Joachim Zobel <jzobel heute-morgen.de>, Eric Covener]
154 *) mod_rewrite: Improve 'bad flag delimeters' startup error by showing
155 how the input was tokenized. PR 56528. [Edward Lu <Chaosed0 gmail.com>]
157 *) mod_proxy: Don't put non balancer-member workers in error state by
158 default for connection or 500/503 errors, and honor status=+I for
159 any error. PR 48388. [Yann Ylavic]
161 *) mod_socache_memcache: Pass expiration time through to memcached. PR 55445.
162 [Faidon Liambotis <paravoid debian.org>, Joe Orton]
164 *) ap_expr: Add filemod function for checking file modification dates
167 *) mod_authnz_ldap: Resolve crashes with LDAP authz and non-LDAP authn since
168 r1608202. [Eric Covener]
170 *) core: Ensure that httpd exits with an error status when the MPM fails
171 to run. [Yann Ylavic]
173 *) apreq: Content-Length header should be always interpreted as a decimal.
174 Leading 0 could be erroneously considered as an octal value. PR 56598.
175 [Chris Card <ctcard hotmail com>]
177 *) mod_proxy: Now allow for 191 character worker names, with non-fatal
178 errors if name is truncated. PR53218. [Jim Jagielski]
180 *) mod_ssl: Add optional function "ssl_get_tls_cb" to allow support
181 for channel bindings. [Simo Sorce <simo redhat.com>]
183 *) mod_proxy_wstunnel: Concurrent websockets messages could be
184 lost or delayed with ProxyWebsocketAsync enabled.
185 [Edward Lu <Chaosed0 gmail.com>]
187 *) core, mod_info: Add compiled and loaded PCRE versions to version
188 number display. [Rainer Jung]
190 *) mod_authnz_ldap: Return LDAP connections to the pool before the handler
191 is run, instead of waiting until the end of the request. [Eric Covener]
193 *) mod_log_config: Add GlobalLog to allow a globally defined log to
194 be inherited by virtual hosts that define a CustomLog.
195 [Edward Lu <Chaosed0 gmail.com>]
197 *) mod_proxy_html: support automatic detection of doctype and processing
198 of FPIs. PR56285 [Micha Lenk <micha lenk info>, Nick Kew]
200 *) mod_proxy_html: skip documents shorter than 4 bytes
201 PR 56286 [Micha Lenk <micha lenk info>]
203 *) mod_proxy_fdpass: Fix computation of the size of 'struct sockaddr_un'
204 when passed to 'connect()'.
205 [Graham Dumpleton <grahamd apache org>]
207 *) core: Add ap_mpm_resume_suspended() API to allow a suspended connection
209 [Artem <artemciy gmail.com>, Edward Lu <Chaosed0 gmail.com>]
211 *) core: Add ap_mpm_register_socket_callback_timeout() API. [Eric Covener]
213 *) mod_proxy_wstunnel: Honor ProxyWebsocketIdleTimeout in asynchronous
214 processing mode. [Eric Covener]
216 *) mod_authnz_ldap: Fail explicitly when the filter is too long. Remove
217 unnecessary apr_pstrdup() and strlen(). [Graham Leggett]
219 *) Add the ldap-search option to mod_authnz_ldap, allowing authorization
220 to be based on arbitrary expressions that do not include the username.
223 *) Add the ldap function to the expression API, allowing LDAP filters and
224 distinguished names based on expressions to be escaped correctly to
225 guard against LDAP injection. [Graham Leggett]
227 *) Add module mod_ssl_ct, which provides an implementation of Certificate
228 Transparency (RFC 6962) for httpd. [Jeff Trawick]
230 *) mod_remoteip: Prevent an external proxy from presenting an internal
231 proxy. PR 55962. [Mike Rumph]
233 *) mod_ssl: Add hooks to allow other modules to perform processing at
234 several stages of initialization and connection handling. See
235 mod_ssl_openssl.h. [Jeff Trawick]
237 *) mod_proxy_wstunnel: Avoid sending error responses down an upgraded
238 websockets connection as it is being close down. [Eric Covener]
240 *) mod_proxy_wstunnel: Allow the administrator to cap the amount
241 of time a synchronous websockets connection stays idle with
242 ProxyWebsocketIdleTimeout. [Eric Covener]
244 *) mod_proxy_wstunnel: Change to opt-in for asynchronous support, adding
245 directives ProxyWebsocketAsync and ProxyWebsocketAsyncDelay.
248 *) mod_proxy_wstunnel: Stop leaking websockets backend connections under
249 event MPM (trunk-only). [Eric Covener]
251 *) mod_proxy_http: Add detach_backend hook (potentially usable
252 in other proxy scheme handlers). [Jeff Trawick]
254 *) mod_deflate: Add DeflateAlterETag to control how the ETag
255 is modified. The 'NoChange' parameter mimics 2.2.x behavior.
256 PR 45023, PR 39727. [Eric Covener]
258 *) mod_rewrite: Add 'BNF' (backreferences-no-plus) flag to RewriteRule to
259 allow spaces in backreferences to be encoded as %20 instead of '+'.
262 *) mod_rewrite: Support an optional list of characters to escape in the
263 argument for the 'B' (escape backreferences) flag. [Eric Covener]
265 *) mod_dir: Default to 2.2-like behavior and skip execution when method is
266 neither GET nor POST, such as for DAV requests. PR 54914. [Chris Darroch]
268 *) mod_rewrite: Rename the handler that does per-directory internal
269 redirects to "rewrite-redirect-handler" from "redirect-handler" so
270 it is less ambiguous and less likely to be reused. [Eric Covener]
272 *) mod_rewrite: Protect against looping with the [N] flag by enforcing a
273 default limit of 10000 iterations, and allowing each rule to change its
274 limit. [Eric Covener]
276 *) mod_ssl: Fix config merging of SSLOCSPEnable and SSLOCSPOverrideResponder.
279 *) Add HttpContentLengthHeadZero and HttpExpectStrict directives.
280 [Yehuda Sadeh <yehuda inktank com>, Justin Erenkrantz]
282 *) mod_ssl: Add -t -DDUMP_CA_CERTS option which dumps the filenames of all
283 configured SSL CA certificates to stdout the same way as DUMP_CERTS does.
286 *) mod_ssl: Don't flush when an EOS is received. Prepares mod_ssl
287 to support write completion. [Graham Leggett]
289 *) core: Add parse_errorlog_arg callback to ap_errorlog_provider
290 to allow providers to check the ErrorLog argument. [Jan Kaluza]
292 *) mod_cgid: Use the servers Timeout for each read from a CGI script,
293 allow override with new CGIDRequestTimeout directive. PR43494
294 [Eric Covener, Toshikuni Fukaya <toshikuni-fukaya cybozu co jp>]
296 *) core: ensure any abnormal exit is reported to stderr if it's a tty.
299 *) mod_lua: Let the Inter-VM get/set functions work with a global
300 shared memory pool instead of a per-process pool. [Daniel Gruno]
302 *) ldap: Support ldaps when using the Microsoft LDAP SDK.
303 PR 54626. [Jean-Frederic Clere]
305 *) mod_authnz_ldap: Change default value of AuthLDAPMaxSubGroupDepth to 0
306 to avoid performance problems when subgroups aren't in use. [Eric Covener]
308 *) mod_syslog: New module implementing syslog ap_error_log provider.
309 Previously, this code was part of core, now it's in separate module.
312 *) core: Add ap_errorlog_provider to make ErrorLog logging modular. Move
313 syslog support from core to new mod_syslog. [Jan Kaluza]
315 *) mod_status, mod_echo: Fix the display of client addresses.
316 They were truncated to 31 characters which is not enough for IPv6 addresses.
317 PR 54848 [Bernhard Schmidt <berni birkenwald de>]
319 *) mod_unique_id: Use output of the PRNG rather than IP address and
320 pid, avoiding sleep() call and possible DNS issues at startup,
321 plus improving randomness for IPv6-only hosts.
322 [Jan Kaluza <jkaluza redhat.com>]
324 *) mod_file_cache: mod_file_cache should be able to serve files that
325 haven't had a Content-Type set via e.g. mod_mime. [Eric Covener]
327 *) core: merge AllowEncodedSlashes from the base configuration into
328 virtual hosts. [Eric Covener]
330 *) AIX: Install DSO's with "cp" instead of "install" in instdso.sh
333 *) mod_ldap: Don't keep retrying if a new LDAP connection times out.
336 *) mod_deflate: permit compilation of mod_deflate against a zlib that has
337 been configured with -D Z_PREFIX, which redefines the token "deflate".
340 *) mod_auth_digest: Use the secret when generating nonces in all cases and
341 not only when AuthName is used in .htaccess files (this change may cause
342 problems if used with round robin load balancers). Don't regenerate the
343 secret on graceful restarts. PR 54637 [Stefan Fritsch]
345 *) core: Remove apr_brigade_flatten(), buffering and duplicated code
346 from the HTTP_IN filter, parse chunks in a single pass with zero copy.
347 Reduce memory usage by 48 bytes per request. [Graham Leggett]
349 *) core: Stop the HTTP_IN filter from attempting to write error buckets
350 to the output filters, which is bogus in the proxy case. Create a
351 clean mapping from APR codes to HTTP status codes, and use it where
352 needed. [Graham Leggett]
354 *) mod_proxy: Ensure network errors detected by the proxy are returned as
355 504 Gateway Timout as opposed to 502 Bad Gateway, in order to be
356 compliant with RFC2616 14.9.4 Cache Revalidation and Reload Controls.
358 *) mod_dav: mod_dav overrides dav_fs response on PUT failure. PR 35981
359 [Basant Kumar Kukreja <basant.kukreja sun.com>, Alejandro Alvarez
360 <alejandro.alvarez.ayllon cern.ch>]
362 *) mod_ldap: LDAP connections used for authentication were not respecting
363 LDAPConnectionPoolTimeout. PR 54587
365 *) core: ap_rgetline_core now pulls from r->proto_input_filters.
367 *) mod_proxy_html: process parsed comments immediately.
368 Fixes bug where parsed comments may be lost. [Nick Kew]
370 *) mod_proxy_html: introduce doctype for HTML 5 [Nick Kew]
372 *) mod_proxy_html: fix typo-bug processing "strict" vs "transitional"
373 HTML/XHTML [Nick Kew]
375 *) core: Add option to add valgrind support. Use it to reduce false positive
376 warnings in mod_ssl. [Stefan Fritsch]
378 *) mod_authn_file, mod_authn_dbd, mod_authn_dbm, mod_authn_socache:
379 Cache the result of the most recent password hash verification for every
380 keep-alive connection. This saves some expensive calculations.
383 *) http: Remove support for Request-Range header sent by Navigator 2-3 and
384 MSIE 3. [Stefan Fritsch]
386 *) core, http: Extend HttpProtocol with an option to enforce stricter HTTP
387 conformance or to only log the found problems. [Stefan Fritsch]
389 *) core: Correctly parse an IPv6 literal host specification in an absolute
390 URL in the request line. [Stefan Fritsch]
394 *) core: Add LogLevelOverride directive that allows to override the
395 loglevel for clients from certain IPs. This also works for things
396 like the SSL handshake where <If> LogLevel ... </If> is evaluated
397 too late. [Stefan Fritsch]
399 *) core: Add new directive Warning to issue warnings from a configuration
400 file. Both Warning and Error now generate a timestamped log message.
403 *) ap_expr: Add SERVER_PROTOCOL_VERSION, ..._MAJOR, and ..._MINOR
404 variables. [Stefan Fritsch]
406 *) core: New directive RegisterHttpMethod for registering non-standard
407 HTTP methods. [Stefan Fritsch]
409 *) core: New directive HttpProtocol which allows to disable HTTP/0.9
410 support. [Stefan Fritsch]
412 *) mod_allowhandlers: New module to forbid specific handlers for specific
413 directories. [Stefan Fritsch]
415 *) mod_systemd: New module, for integration with systemd on Linux.
416 [Jan Kaluza <jkaluza redhat.com>]
418 *) WinNT MPM: Store pid and generation for each thread in scoreboard
419 to allow tracking of threads from exiting children via mod_status
420 or other such mechanisms. [Jeff Trawick]
422 *) The following now respect DefaultRuntimeDir/DEFAULT_REL_RUNTIMEDIR:
423 - APIs: ap_log_pid(), ap_remove_pid, ap_read_pid()
424 - mod_cache: thundering herd lock directory
425 - mod_lbmethod_heartbeat, mod_heartmonitor: heartbeat storage file
426 - mod_ldap: shared memory cache
427 - mod_socache_shmcb, mod_socache_dbm: shared memory or dbm for cache
430 *) suexec: Add --enable-suexec-capabilites support on Linux, to use
431 setuid/setgid capability bits rather than a setuid root binary.
434 *) suexec: Add support for logging to syslog as an alternative to logging
435 to a file; configure --without-suexec-logfile --with-suexec-syslog.
438 *) mod_ssl: Add support for TLS Next Protocol Negotiation. PR 52210.
439 [Matthew Steele <mdsteele google.com>]
441 *) cross-compile: allow to provide CC_FOR_BUILD so that gen_test_char will
442 be compiled by the build compiler instead of the host compiler.
443 Also set CC_FOR_BUILD to 'cc' when cross-compilation is detected.
444 PR 51257. [Guenter Knauf]
446 *) core: In maintainer mode, replace apr_palloc with a version that
447 initializes the allocated memory with non-zero values, except if
448 AP_DEBUG_NO_ALLOC_POISON is defined. [Stefan Fritsch]
450 *) mod_policy: Add a new testing module to help server administrators
451 enforce a configurable level of protocol compliance on their
452 servers and application servers behind theirs. [Graham Leggett]
454 *) mod_firehose: Add a new debugging module able to record traffic
455 passing through the server in such a way that connections and/or
456 requests be reconstructed and replayed. [Graham Leggett]
466 [Apache 2.5.0-dev includes those bug fixes and changes with the
467 Apache 2.4.xx tree as documented below, except as noted.]
469 Changes with Apache 2.4.x and later:
471 *) http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/CHANGES?view=markup
473 Changes with Apache 2.2.x and later:
475 *) http://svn.apache.org/viewvc/httpd/httpd/branches/2.2.x/CHANGES?view=markup
477 Changes with Apache 2.0.x and later:
479 *) http://svn.apache.org/viewvc/httpd/httpd/branches/2.0.x/CHANGES?view=markup