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Changes with Apache 2.0.27-dev

  *) Cleanup the proxy code that creates a request to the origin
     server.  This change adds an optional hook, which allows modules
     to gain control while the request is created if the proxy module
     is loaded.  The purpose of this hook is to allow modules to add
     input and/or output filters to the request to the origin.  While
     I was at it, I made the core use this hook, so that proxy request
     creation uses some of the code from the core.  This can still be
     greatly improved, but this is a good start.  [Ryan Bloom]

Changes with Apache 2.0.26
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  *) Port the MaxClients changes from the worker MPM to the threaded
     MPM.  [Ryan Bloom]

  *) Fix mod_proxy so that it handles chunked transfer-encoding and works
     with the new input filtering system.  [Justin Erenkrantz]

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  *) Introduce the MultiviewsMatch directive, to allow the operator
     to be flexible in recognizing Handlers and Filters filename
     extensions as part of the Multiviews matching logic, strict with
     MultiviewsMatch NegotiatedOnly to accept only filename extentions 
     that designate negotiated parameters, (content type, charset, etc.)
     or MultiviewsAll for the 1.3 behavior of matching any files, even
     if they have unregistered extensions.  [William Rowe]

  *) Fixed the configure script to add a LoadModule directive to
     the default httpd.conf for any module that was compiled
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     as a DSO.  [Aaron Bannert <aaron@clove.org>]
  *) rewrite mod_ssl input filtering to work with the new input filtering
     system.  [Justin Erenkrantz]

  *) prefork: Don't segfault when we are able to listen on some but
     not all of the configured ports.  [Jeff Trawick]

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  *) Build mod_so even if no core modules are built shared.
     [Aaron Bannert <aaron@clove.org>]

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  *) Introduce ap_directory_walk rewrite (with further optimizations
     required) to adapt to the ap_process_request_internal() changes.
     Optimized so subrequests and redirects now reuse previous section 
     merges, until we mismatch with the original directory_walk, and
     precomputed r->finfo results will cause directory_walk to skip
     the most expensive phases of the function.  [William Rowe]

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  *) Allow ApacheMonitor to connect to and control Apache on other 
     WinNT/2K machines.   [Mladen Turk <mturk@mappingsoft.com>]
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  *) Remove the Port directive.  In it's place, the Listen directive
     is now a required directive, which tells Apache what port to
     listen on.  The ServerName directive has also been extended
     to accept an optional port.  If the port is specified to the
     ServerName, the server will report that port whenever it
     reports the port that it is listening on.  This change was
     made to ease configuration errors that stem from having a Port
     directive, and a Listen directive.  In that situation, the server
     would only listen to the port specified by the Listen command,
     which caused a lot of confusion to users.  [Ryan Bloom]

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  *) Added mod_mime_magic, mod_unique_id and mod_vhost_alias to the Win32
     build, as loadable modules.  [William Rowe]

  *) Fix --enable-mods-shared processing.  If most is specified,
     then all modules that can be compiled as shared modules are.
     [Aaron Bannert <aaron@clove.org>]

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  *) Update the mime.types file to map video/vnd.mpegurl to mxu
     and add commonly used audio/x-mpegurl for m3u extensions.        
     [Heiko Recktenwald <uzs106@uni-bonn.de>, Lars Eilebrecht]

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  *) Eliminate the depreciated r->content_language, in favor of the array
     r->content_languages introduced many years ago.  Module authors must
     substantially overhaul their modules, so this needs to be upgraded
     if the module still relied on backwards-brokeness.  [William Rowe]

  *) Allow configure help strings to work with autoconf 2.50+ and 2.13.
     [Justin Erenkrantz]

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  *) Rewrite the input filtering mechanisms to consolidate and reorganize
     code.  In short, core_input_filter does something now and
     ap_http_filter is now only concerned with HTTP.  [Justin Erenkrantz]

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  *) Update the Win32 build to re-absorb mod_proxy and family.
     [William Rowe]

  *) Resolved the build failure on Win32 using MSVC 5.0 (without the
     current SDK.)  [William Rowe]

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  *) Some style changes to the code that does ProxyErrorOverride. Fixed
     config merge behaviour. [Graham Leggett]

  *) Allow support programs to be compiled against a static version
     of libapr.  This allows the smaller support programs to be 
     relocated.  [Aaron Bannert <aaron@clove.org>]

  *) Update the mime.types file to the registered media types as
     of 2001-09-25, and add mapping for xsl extension [Mark Cox]

  *) Fix MaxClients in the Worker MPM, so that it specifies the maximum
     number of clients that can connect at the same time, instead of
     specifying the maximum number of child processes.
     [Aaron Bannert <aaron@clove.org>]

  *) Switch proc_pthread AcceptMutex configuration directive to pthread to 
     be consistent with 1.3.  [Justin Erenkrantz]

  *) Cache apr_explode_localtime() value for 15 seconds.
     [Brian Pane <bpane@pacbell.net>]

  *) Fix mod_include to not return ETag or Last-Modified headers.
     [Ian Holsman <ianh@cnet.com>]

  *) Fix worker MPM's scoreboard logic.  [Aaron Bannert <aaron@clove.org>]

  *) Eliminate the wasteful run-time conversion of method names from strings 
     to numbers in places where the methods are known at compile time.  
     [Brian Pane <bpane@pacbell.net>]

  *) Turn the worker MPM's queue into a LIFO.  This may
     improve cache-hit performance under some conditions.
     [Aaron Bannert <aaron@clove.org>]

  *) Switch back to SIGUSR1 for graceful restarts on all platforms that
     support it.  [Justin Erenkrantz]

  *) Cleanup the worker MPM.  We no longer re-use transaction
     pools.  This incurs less overhead than shuffling the pools
     around so that they can be re-used.  Remove one of the
     queue's condition variables.  We just redefined the API to
     state that you can't try to add more stuff than you allocated
     segments for.  [Aaron Bannert <aaron@clove.org>]

  *) Fix SSL VPATH builds [Cody Sherr <csherr@covalent.net>]

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  *) Fixed persistent connections when a request contains a body.
     [Greg Stein]

  *) mod_dav uses a new API to speak to the backend provider for dead
     property management. [Greg Stein]

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  *) Remove the Win32 script-processing exception from mod_cgi, and
     roll build_command_line/build_argv_list into a unified, overrideable
     ap_cgi_build_command optional function.  [William Rowe]

  *) Rewrite find_start_sequence to use a better search algorithm
     to find the start tag.  [Justin Erenkrantz]

  *) Fix a seg fault in mod_include.  When we are generating an
     internal redirect, we must set r->uri to "", not a bogus
     string, and not NULL.  [Ryan Bloom]

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  *) Optimized location_walk, so subrequests, redirects and second passes
     now reuse previous section merges on a <Location > by <Location >
     basis, until we mismatch with the original location_walk. 
     [William Rowe]

  *) Back out the 1.45 change to util_script.c.  This change made
     us set the environment variable REQUEST_URI to the redirected
     URI, instead of the originally requested URI.
     [Taketo Kabe <kabe@sra-tohoku.co.jp>]

  *) Make mod_include do lazy evaluation of potentially expensive to
     compute variables.  [Brian Pane <bpane@pacbell.net>]

  *) Fix logging of bytes sent for HEAD requests.  %b and %B should
     log either - or 0, before this patch, they were both logging
     the file size.  [Taketo Kabe <kabe@sra-tohoku.co.jp>]

  *) Make mod_include check for BYTE_CHECK_THRESHOLD per bucket rather 
     than per character.  [Brian Pane <bpane@pacbell.net>]

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  *) Normalize the primary request, redirects and sub-requests to
     run the same ap_process_request_internal for consistency in
     robustness, behavior and security.  [William Rowe]

  *) Fix a segfault with mod_include when r->path_info is not set
     (which is the case with mod_proxy).  [Ian Holsman <ianh@cnet.com>]

  *) Add -X functionality back.  This indicates to all MPMs and any other
     part of Apache that it should run in "debug" mode.  [Justin Erenkrantz]

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  *) Some initial support for the cygwin platform [prefork only].
     This is not to be confused with support for the WinNT/Win32
     platform, which is the recommended configuration for native
     Win32 users.  The cygwin platform support is recommended for
     cygwin platform users. [Stipe Tolj <tolj@wapme-systems.de>]

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  *) Changed syntax of Set{Input|Output}Filter.  The list of filters
     must be semicolon delimited (if more than one filter is given.)
     The Set{Input|Output}Filter directive now overrides a parent
     container's directive (e.g. SetInputFilter in <Directory /web/foo>
     will override any SetInputFilter directive in <Directory /web>.)
     This new syntax is more consistent with Add{Input|Output}Filter
     directives defined in mod_mime.  Also cures a bug in prior releases
     where the Set{Input|Output}Filter directive would corrupt the 
     global configuration if the multiple directives were nested.
     [William Rowe]

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