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