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Changes with Apache 2.0.23

  *) Improve content generation throughout Apache, providing closer
     compliance with HTML 3.2, HTML 4.01 Transitional and XHTML 1.0
     Transitional specifications.  [William Rowe]

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Changes with Apache 2.0.22
  
  *) Fix a problem where the threaded MPM stalls after restarts or
     segfaults.  Also prevent multiple active processes from using
     the same scoreboard slot.  [Greg Ames]
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  *) Apache/Win32 now fills in the service description with Apache's
     server version string, including loaded and advertised modules.
     [William Rowe]

  *) Improved support for the Win32 build, to recover gracefully from
     missing apr or apr-util directories or the awk interpreter, 
     create the proper cgi-bin examples, including a test-cgi.bat, and 
     fix the perl shebang line for printenv.pl, when installing from 
     the build environment.  [William Rowe]

  *) Fix a segfault in threaded.c caused by passing uninitialized
     apr_thread_t * to apr_thread_join().  [Jeff Trawick]

  *) Use new APR number conversion functions to reduce CPU consumption 
     when setting the content length, and in mod_log_config.
     [Brian Pane]
     
  *) Fix problem reported by Taketo Kabe <kabe@sra-tohoku.co.jp>
     where HEAD response headers were being repeated twice for
     files greater than 32K bytes (4*AP_MIN_BYTES_TO_WRITE). This
     problem in the http_header filter was exposed by the recent rewrite
     of the content_length filter. [Taketo Kabe, Bill Stoddard]

  *) Fix seg faults in mod_status with ExtendedStatus enabled, after
     restarts.  A garbage pointer to a vhost's server_rec from the
     previous generation was being left around under certain
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  *) Fix a cosmetic problem with mod_include.  Non-existant SSI vars
     used to appear as '(none', without the closing paren.
     [Günter Knauf <eflash@gmx.net>]

  *) Improve the exports generating awk script.  In the past, we had
     work around problems in the awk script by avoiding some #if and
     #ifdefs.  This has bitten us many times in generating the exports.c
     file.  This improvement allows corrects the header file parsing.
     [Sander Striker <striker@apache.org>]

Changes with Apache 2.0.21
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  *) Resolve the Win32 htpasswd bug, where a file that existed would be
     overwritten, regardless of the -c flag.
     [William Rowe, Mladen Turk <mladen.turk@mail.inet.hr>]

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  *) Introduce connection sub-pools into ab.  Truncating the lifetime
     of these allocations means that ab no longer perpetually grows
     its working set, running out of memory on large request attempts.
     [William Rowe]

  *) Make scoreboard creation a hook.  This allows management
     modules to have access to the scoreboard at the time that it is
     created, and at every restart request.  
     [Cody Sherr <csherr@covalent.net>]

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  *) Changed AP_MPMQ_MAX_DAEMONS to refer to MaxClients and
     added an AP_MPMQ_MAX_DAEMON_USED to refer to the highest
     daemon index actually used in the scoreboard. I also
     updated the pertinent calls. [Paul J. Reder]

  *) Win32: Prevent listening sockets from being inherited by
     the Apache child process, CGI scripts, rotatelog process
     etc.  If the Apache child process segfaults, any processes 
     that the child started are not reaped. Prior to this fix,
     these processes inherited the listening sockets which sometimes
     prevented the restarted Apache child process from accepting
     connections (ie, the server would hang). 
     [Bill Stoddard]

  *) Provide vhost and request strings when ExtendedStatus is on.
     [Greg Ames]

  *) Fix some issues with the pod and prefork: check the pod *after*
     processing a connection so that a server processing a time-
     consuming request bails out as soon as practical; when the
     parent process wakes up a server process via connect(), use an
     APR timeout on the connect() so that we don't hang for a long
     time if there aren't server processes around to do accept().
     [Jeff Trawick, Greg Ames]

  *) Performance improvement to mod_mime.c. find_ct() in mod_mime, 
     spends a lot of time in apr_table_get calls.  Using the default 
     httpd.conf, the tables for languages and charsets are somewhat
     large, so the time spent scanning them on each request is
     significant. Replacing the tables with hash tables provides
     a nice speedup. [Brian Pane <bpane@pacbell.net>]
  *) Add two functions to allow modules to access random parts of the
     scoreboard.  This allows modules compiled for one MPM to access the
     scoreboard, even if it the server was compiled for another MPM.
     [Harrie Hazewinkel <harrie@covalent.net>]

Changes with Apache 2.0.20
  *) Fix problem in content-length filter where the filter would
     buffer all the output from a CGI before sending any bytes
     down the filter stack to the network. This problem would cause
     significant memory consumption if the CGIs generated
     lots of bytes. [Bill Stoddard]
  
  *) Get non-blocking CGI pipe reads working with the bucket brigades.
     [Bill Stoddard]
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  *) Fix seg fault on Windows when serving files cached with mod_file_cache.
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     [Bill Stoddard]

  *) Fix a bug in the threaded MPM that would cause it to kill off all
     workers immediately after starting if the number of workers started
     was above a certain threshold.  [Ryan Bloom, Bill Stoddard]
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Changes with Apache 2.0.19
  *) Fix problem with threaded MPM.  The problem was that if each child
     process was busy serving a single long-lived request and the server
     was sent a graceful restart signal, the server would stop serving
     requests.  This would happen because each child process would wait to
     die until the last thread was done, and the parent wouldn't spawn any
     new children until a process died.  Now, the parent looks at the fact
     that the children are dying gracefully, and starts new children.
     Those new children only start enough threads to compliment the number
     of threads in the other child process that shares the same spot in
     the scoreboard.  In this way, we make sure to never go over
     MaxClients.  [Ryan Bloom]

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  *) modified mod_negotiation and mod_autoindex to speed up by almost a
     factor of two on apr_dir_read()-enhanced platforms, such as Win32
     and OS2, by calling ap_sub_request_lookup_dirent() with the results
     already provided by apr_dir_read().  [William Rowe]

  *) mod_file_cache is now more robust to filtering and serves requests
     slightly more efficiently.  [Cliff Woolley]

  *) Fix problem handling FLUSH bucket in the chunked encoding filter.
     Module was calling ap_rwrite() followed by ap_rflush() but the 
     served content was not being displayed in the browser. Inspection
     of the output stream revealed that the first data chunk was
     missing the trailing CRLF required by the RFC.  [Bill Stoddard]
  *) apxs no longer generates ap_send_http_header() in the example handler

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  *) Fix an ab problem which could cause a divide-by-zero exception
     with certain invocations (e.g., ab -k -c 6 -n 100 localhost/).
     [Ian Holsman <ianh@cnet.com>]

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  *) Solve case-insensitive platforms' confusion about negotiated
     filenames, allowing files of differnt case to match in choosing
     the document to serve.  [William Rowe]

  *) Fix brokenness when ThreadsPerChild is higher than the built-in
     limit.  We left ap_threads_per_child at the higher value which
     led to segfaults when doing certain scoreboard operations.
     [Jeff Trawick]

  *) Fix seg faults and/or missing output from mod_include.  The
     default_handler was using the subrequest pool for files and
     MMAPs, even though the associated APR structures typically 
     live longer than the subrequest. [Greg Ames]
  
  *) Extend mod_setenvif to support specifying regular expressions
     on the SetEnvIf (and SetEnvIfNoCase) directive attribute field.
     Example:  SetEnvIf ^TS*  [a-z].* HAVE_TS 
     will cause HAVE_TS to be set if any of the request headers begins 
     with "TS" and has a value that begins with any character in the
     set [a-z]. [Bill Stoddard]

  *) httpd children now re-bind themselves to a random CPU on
     multiprocessor systems on AIX via bindprocessor() in 2.0.
     [Victor J. Orlikowski]
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  *) Fix htdigest. It would go into a loop in getline when adding 
     a second user. [Bill Stoddard]

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  *) Win32 platforms now fully support mod_userdir options.  [Will Rowe]

  *) Automatically generate httpd.exp for AIX.
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     DSOs now work again on AIX in 2.0
     [Victor J. Orlikowski]
  *) Add a new request hook, error_log.  This phase allows modules
     to act on the error log string _after_ it has been written
     to the error log.  The goal for this hook is to allow monitoring
     modules to send the error string to the monitoring agent.
     [Ryan Bloom]

  *) Modify mod_echo to make it use filters for input and output.
     [Ryan Morgan <rmorgan@covalent.net>]

  *) Extend mod_headers to support conditional driven Header 
     add, append and set. Use SetEnvIf to set an envar and conditionally
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