Project description.

The Apache HTTP Server Project is an effort to develop and maintain an open-source HTTP server for modern operating systems including UNIX and Windows NT.

The goal of this project is to provide a secure, efficient and extensible server that provides HTTP services in sync with the current HTTP standards

Apache 2.3.0 Changelog
  • mod_ratelimit: New module to do bandwidth rate limiting. [Paul Querna]
  • Remove X-Pad header which was added as a work around to a bug in Netscape 2.x to 4.0b2. [Takashi Sato ]
  • Add DTrace Statically Defined Tracing (SDT) probes. [Theo Schlossnagle , Paul Querna]
  • mod_proxy_balancer: Move all load balancing implementations as individual, self-contained mod_proxy submodules under modules/proxy/balancers [Jim Jagielski]
  • Rename APIs to include ap_ prefix: find_child_by_pid -> ap_find_child_by_pid suck_in_APR -> ap_suck_in_APR sys_privileges_handlers -> ap_sys_privileges_handlers unixd_accept -> ap_unixd_accept unixd_config -> ap_unixd_config unixd_killpg -> ap_unixd_killpg unixd_set_global_mutex_perms -> ap_unixd_set_global_mutex_perms unixd_set_proc_mutex_perms -> ap_unixd_set_proc_mutex_perms unixd_set_rlimit -> ap_unixd_set_rlimit [Paul Querna]
  • mod_lbmethod_heartbeat: New module to load balance mod_proxy workers based on heartbeats. [Paul Querna]
  • mod_heartmonitor: New module to collect heartbeats, and write out a file so that other modules can load balance traffic as needed. [Paul Querna]
  • mod_heartbeat: New module to generate multicast heartbeats to know if a server is online. [Paul Querna]
  • mod_buffer: Honour the flush bucket and flush the buffer in the input filter. Make sure that metadata buckets are written to the buffer, not to the final brigade. [Graham Leggett]
  • mod_buffer: Optimise the buffering of heap buckets when the heap buckets stay exactly APR_BUCKET_BUFF_SIZE long. [Graham Leggett, Ruediger Pluem]
  • mod_buffer: Optional support for buffering of the input and output filter stacks. Can collapse many small buckets into fewer larger buckets, and prevents excessively small chunks being sent over the wire. [Graham Leggett]
  • mod_privileges: new module to make httpd on Solaris privileges-aware and to enable different virtualhosts to run with different privileges and Unix user/group IDs [Nick Kew]
  • mod_mem_cache: this module has been removed. [William Rowe]
  • authn/z: Remove mod_authn_default and mod_authz_default. [Chris Darroch]
  • authz: Fix handling of authz configurations, make default authz logic replicate 2.2.x authz logic, and replace , Reject, and AuthzMergeRules directives with Match, , and AuthzMerge directives. [Chris Darroch]
  • mod_authn_core: Prevent crash when provider alias created to provider which is not yet registered. [Chris Darroch]
  • mod_authn_core: Add AuthType of None to support disabling authentication. [Chris Darroch]
  • core: Allow and directives to nest, and constrain their use to conform with that of other access control and authorization directives. [Chris Darroch]
  • unixd: turn existing code into a module, and turn the set user/group and chroot into a child_init function. [Nick Kew]
  • mod_dir: Support "DirectoryIndex disabled" Suggested By AndrĂ© Warnier [Eric Covener]
  • mod_ssl: Send Content-Type application/ocsp-request for POST requests to OSCP responders. PR 46014 [Dr Stephen Henson ]
  • mod_authnz_ldap: don't return NULL-valued environment variables to other modules. PR 39045 [Francois Pesce ]
  • Don't adjust case in pathname components that are not of interest to mod_mime. Fixes mod_negotiation's use of such components. PR 43250 [Basant Kumar Kukreja ]
  • Be tolerant in what you accept - accept slightly broken status lines from a backend provided they include a valid status code. PR 44995 [Rainer Jung ]
  • New module mod_sed: filter Request/Response bodies through sed [Basant Kumar Kukreja ]
  • mod_auth_form: Make sure that basic authentication is correctly faked directly after login. [Graham Leggett]
  • mod_session_cookie, mod_session_dbd: Make sure cookies are set both within the output headers and error output headers, so that the session is maintained across redirects. [Graham Leggett]
  • mod_auth_form: Make sure the logged in user is populated correctly after a form login. Fixes a missing REMOTE_USER variable directly following a login. [Graham Leggett]
  • mod_session_cookie: Make sure that cookie attributes are correctly included in the blank cookie when cookies are removed. This fixes an inability to log out when using mod_auth_form. [Graham Leggett]
  • mod_session: Prevent a segfault when a CGI script sets a cookie with a null value. [David Shane Holden ]
  • core, authn/z: Determine registered authn/z providers directly in ap_setup_auth_internal(), which allows optional functions that just wrapped ap_list_provider_names() to be removed from authn/z modules. [Chris Darroch]
  • authn/z: Convert common provider version strings to macros. [Chris Darroch]
  • core: When testing for slash-terminated configuration paths in ap_location_walk(), don't look past the start of an empty string such as that created by a directive. [Chris Darroch]
  • core, mod_proxy: If a kept_body is present, it becomes safe for subrequests to support message bodies. Make sure that safety checks within the core and within the proxy are not triggered when kept_body is present. This makes it possible to embed proxied POST requests within mod_include. [Graham Leggett]
  • mod_auth_form: Make sure the input filter stack is properly set up before reading the login form. Make sure the kept body filter is correctly inserted to ensure the body can be read a second time safely should the authn be successful. [Graham Leggett, Ruediger Pluem]
  • mod_request: Insert the KEPT_BODY filter via the insert_filter hook instead of during fixups. Add a safety check to ensure the filters cannot be inserted more than once. [Graham Leggett, Ruediger Pluem]
  • ap_cache_cacheable_headers_out() will (now) always merge an error headers _before_ clearing them and _before_ merging in the actual entity headers and doing normal hop-by-hop cleansing. [Dirk-Willem van Gulik].
  • cache: retire ap_cache_cacheable_hdrs_out() which was used for both in- and out-put headers; and replace it by a single ap_cache_cacheable_headers() wrapped in a in- and out-put specific ap_cache_cacheable_headers_in()/out(). The latter which will also merge error and ensure content-type. To keep cache modules consistent with ease. This API change bumps up the minor MM by one [Dirk-Willem van Gulik].
  • Move the KeptBodySize directive, kept_body filters and the ap_parse_request_body function out of the http module and into a new module called mod_request, reducing the size of the core. [Graham Leggett]
  • mod_dbd: Handle integer configuration directive parameters with a dedicated function.
  • Change the directives within the mod_session* modules to be valid both inside and outside the location/directory sections, as suggested by wrowe. [Graham Leggett]
  • mod_auth_form: Add a module capable of allowing end users to log in using an HTML form, storing the credentials within mod_session. [Graham Leggett]
  • Add a function to the http filters that is able to parse an HTML form request with the type of application/x-www-form-urlencoded. [Graham Leggett]
  • mod_session_crypto: Initialise SSL in the post config hook. [Ruediger Pluem, Graham Leggett]
  • mod_session_dbd: Add a session implementation capable of storing session information in a SQL database via the dbd interface. Useful for sites where session privacy is important. [Graham Leggett]
  • mod_session_crypto: Add a session encoding implementation capable of encrypting and decrypting sessions wherever they may be stored. Introduces a level of privacy when sessions are stored on the browser. [Graham Leggett]
  • mod_session_cookie: Add a session implementation capable of storing session information within cookies on the browser. Useful for high volume sites where server bound sessions are too resource intensive. [Graham Leggett]
  • mod_session: Add a generic session interface to unify the different attempts at saving persistent sessions across requests. [Graham Leggett]
  • core, authn/z: Avoid calling access control hooks for internal requests with configurations which match those of initial request. Revert to original behaviour (call access control hooks for internal requests with URIs different from initial request) if any access control hooks or providers are not registered as permitting this optimization. Introduce wrappers for access control hook and provider registration which can accept additional mode and flag data. [Chris Darroch]
  • Introduced ap_expr API for expression evaluation. This is adapted from mod_include, which is the first module to use the new API. [Nick Kew]
  • mod_authz_dbd: When redirecting after successful login/logout per AuthzDBDRedirectQuery, do not report authorization failure, and use first row returned by database query instead of last row. [Chris Darroch]
  • mod_ldap: Correctly return all requested attribute values when some attributes have a null value. PR 44560 [Anders Kaseorg ]
  • core: check symlink ownership if both FollowSymlinks and SymlinksIfOwnerMatch are set [Nick Kew]
  • core: fix origin checking in SymlinksIfOwnerMatch PR 36783 [Robert L Mathews ]
  • Activate mod_cache, mod_file_cache and mod_disk_cache as part of the 'most' set for '--enable-modules' and '--enable-shared-mods'. Include mod_mem_cache in 'all' as well. [Dirk-Willem van Gulik]
  • Also install mod_so.h, mod_rewrite.h and mod_cache.h; as these contain public function declarations which are useful for third party module authors. PR 42431 [Dirk-Willem van Gulik].
  • mod_dir, mod_negotiation: pass the output filter information to newly created sub requests; as these are later on used as true requests with an internal redirect. This allows for mod_cache et.al. to trap the results of the redirect. [Dirk-Willem van Gulik, Ruediger Pluem]
  • mod_ldap: Add support (taking advantage of the new APR capability) for ldap rebind callback while chasing referrals. This allows direct searches on LDAP servers (in particular MS Active Directory 2003+) using referrals without the use of the global catalog. PRs 26538, 40268, and 42557 [Paul J. Reder]
  • ApacheMonitor.exe: Introduce --kill argument for use by the installer. This will permit the installation tool to remove all running instances before attempting to remove the .exe. [William Rowe]
  • mod_ssl: Add support for OCSP validation of client certificates. PR 41123. [Marc Stern , Joe Orton]
  • mod_serf: New module for Reverse Proxying. [Paul Querna]
  • core: Add the option to keep aside a request body up to a certain size that would otherwise be discarded, to be consumed by filters such as mod_include. When enabled for a directory, POST requests to shtml files can be passed through to embedded scripts as POST requests, rather being downgraded to GET requests. [Graham Leggett]
  • mod_ssl: Fix TLS upgrade (RFC 2817) support. PR 41231. [Joe Orton]
  • scoreboard: Correctly declare ap_time_process_request. PR 43789 [Tom Donovan ]
  • core; scoreboard: ap_get_scoreboard_worker(sbh) now takes the sbh member from the connection rec, ap_get_scoreboard_worker(proc, thread) will now provide the unusual legacy lookup. [William Rowe]
  • mpm winnt: fix null pointer dereference PR 42572 [Davi Arnaut]
  • mod_authnz_ldap, mod_authn_dbd: Tidy up the code to expose authn parameters to the environment. Improve portability to EBCDIC machines by using apr_toupper(). [Martin Kraemer]
  • mod_ldap, mod_authnz_ldap: Add support for nested groups (i.e. the ability to authorize an authenticated user via a "require ldap-group X" directive where the user is not in group X, but is in a subgroup contained in X. PR 42891 [Paul J. Reder]
  • mod_ssl: Add support for caching SSL Sessions in memcached. [Paul Querna]
  • apxs: Enhance -q flag to print all known variables and their values when invoked without variable name(s). [William Rowe, Sander Temme]
  • apxs: Eliminate run-time check for mod_so. PR 40653. [David M. Lee ]
  • beos MPM: Create pmain pool and run modules' child_init hooks when entering ap_mpm_run(), then destroy pmain when exiting ap_mpm_run(). [Chris Darroch]
  • netware MPM: Destroy pmain pool when exiting ap_mpm_run() so that cleanups registered in modules' child_init hooks are performed. [Chris Darroch]
  • Fix issue which could cause error messages to be written to access logs on Win32. PR 40476. [Tom Donovan ]
  • The LockFile directive, which specifies the location of the accept() mutex lockfile, is deprecated. Instead, the AcceptMutex directive now takes an optional lockfile location parameter, ala SSLMutex. [Jim Jagielski]
  • mod_authn_dbd: Export any additional columns queried in the SQL select into the environment with the name AUTHENTICATE_. This brings mod_authn_dbd behaviour in line with mod_authnz_ldap. [Graham Leggett]
  • mod_dbd: Key the storage of prepared statements on the hex string value of server_rec, rather than the server name, as the server name may change (eg when the server name is set) at any time, causing weird behaviour in modules dependent on mod_dbd. [Graham Leggett]
  • mod_proxy_fcgi: Added win32 build. [Mladen Turk]
  • sendfile_nonblocking() takes the _brigade_ as an argument, gets the first bucket from the brigade, finds it not to be a FILE bucket and barfs. The fix is to pass a bucket rather than a brigade. [Niklas Edmundsson ]
  • mod_rewrite: support rewritemap by SQL query [Nick Kew]
  • ap_get_server_version() has been removed. Third-party modules must now use ap_get_server_banner() or ap_get_server_description(). [Jeff Trawick]
  • All MPMs: Introduce a check_config phase between pre_config and open_logs, to allow modules to review interdependent configuration directive values and adjust them while messages can still be logged to the console. Handle relevant MPM directives during this phase and format messages for both the console and the error log, as appropriate. [Chris Darroch]
  • core: Do not allow internal redirects like the DirectoryIndex of mod_dir to circumvent the symbolic link checks imposed by FollowSymLinks and SymLinksIfOwnerMatch. [Nick Kew, Ruediger Pluem, William Rowe]
  • New SSLLogLevelDebugDump [ None (default) | IO (not bytes) | Bytes ] configures the I/O Dump of SSL traffic, when LogLevel is set to Debug. The default is none as this is far greater debugging resolution than the typical administrator is prepared to untangle. [William Rowe]
  • mod_disk_cache: If possible, check if the size of an object to cache is within the configured boundaries before actually saving data. [Niklas Edmundsson ]
  • Worker and event MPMs: Remove improper scoreboard updates which were performed in the event of a fork() failure. [Chris Darroch]
  • Add support for fcgi:// proxies to mod_rewrite. [Markus Schiegl ]
  • Remove incorrect comments from scoreboard.h regarding conditional loading of worker_score structure with mod_status, and remove unused definitions relating to old life_status field. [Chris Darroch ]
  • Remove allocation of memory for unused array of lb_score pointers in ap_init_scoreboard(). [Chris Darroch ]
  • Add mod_proxy_fcgi, a FastCGI back end for mod_proxy. [Garrett Rooney, Jim Jagielski, Paul Querna]
  • Event MPM: Fill in the scoreboard's tid field. PR 38736. [Chris Darroch ]
  • mod_charset_lite: Remove Content-Length when output filter can invalidate it. Warn when input filter can invalidate it. [Jeff Trawick]
  • Authz: Add the new module mod_authn_core that will provide common authn directives such as 'AuthType', 'AuthName'. Move the directives 'AuthType' and 'AuthName' out of the core module and merge mod_authz_alias into mod_authn_core. [Brad Nicholes]
  • Authz: Move the directives 'Order', 'Allow', 'Deny' and 'Satisfy' into the new module mod_access_compat which can be loaded to provide support for these directives. [Brad Nicholes]
  • Authz: Move the 'Require' directive from the core module as well as add the directives '', '', '' and 'Reject' to mod_authz_core. The new directives introduce 'AND/OR' logic into the authorization processing. [Brad Nicholes]
  • Authz: Add the new module mod_authz_core which acts as the authorization provider vector and contains common authz directives. [Brad Nicholes]
  • Authz: Renamed mod_authz_dbm authz providers from 'group' and 'file-group' to 'dbm-group' and 'dbm-file-group'. [Brad Nicholes]
  • Authz: Added the new authz providers 'env', 'ip', 'host', 'all' to handle host-based access control provided by mod_authz_host and invoked through the 'Require' directive. [Brad Nicholes]
  • Authz: Convert all of the authz modules from hook based to provider based. [Brad Nicholes]
  • mod_cache: Add CacheMinExpire directive to set the minimum time in seconds to cache a document. [Brian Akins , Ruediger Pluem]
  • mod_authz_dbd: SQL authz with Login/Session support [Nick Kew]
  • Fix typo in ProxyStatus syntax error message. [Christophe Jaillet ]
  • Asynchronous write completion for the Event MPM. [Brian Pane]
  • Added an End-Of-Request bucket type. The logging of a request and the freeing of its pool are now done when the EOR bucket is destroyed. This has the effect of delaying the logging until right after the last of the response is sent; ap_core_output_filter() calls the access logger indirectly when it destroys the EOR bucket. [Brian Pane]
  • Rewrite of logresolve support utility: IPv6 addresses are now supported and the format of statistical output has changed. [Colm MacCarthaigh]
  • Rewrite of ap_coreoutput_filter to do nonblocking writes [Brian Pane]
  • Added new connection states for handler and write completion [Brian Pane]
  • mod_cgid: Refuse to work on Solaris 10 due to OS bugs. PR 34264. [Justin Erenkrantz]
  • Teach mod_ssl to use arbitrary OIDs in an SSLRequire directive, allowing string-valued client certificate attributes to be used for access control, as in: SSLRequire "value" in OID("1.3.6.1.4.1.18060.1") [Martin Kraemer, David Reid]
  • [Apache 2.3.0-dev includes those bug fixes and changes with the Apache 2.2.xx tree as documented, and except as noted, below.]