Apache 2.0.14 Released as Alpha

Monday Mar 12th 2001 by ServerWatch Staff

Apache 2.0 offers numerous enhancements, improvements and performance boosts over the 1.3 codebase.

From the Apache Group:
The Apache Group is proud to announce the release the fourteenth release
of Apache 2.0.  This release is the first release to use our new release
process.  This process allows the Apache developers to more easily
determine the quality of any release.  Instead of tagging any release
as an alpha or beta from now on, all releases will be available as
numbered releases, and the release status will only be available in the
tarball name.  More information is available on this process in the
Apache development archives.

Apache 2.0 offers numerous enhancements, improvements and performance
boosts over the 1.3 codebase. The most visible and noteworthy addition
is the ability to run Apache in a hybrid thread/process mode on any
platform that supports both threads and processes.  This has shown to
improve the scalability of the Apache HTTPD server significantly in
our early testing, on some versions of Unix.  With this version of Apache,
we have also added support for filtered I/O.  This allows modules to modify
the output of other modules before it is sent to the client.  This release also
greatly improves the performance and robustness of Apache on the
Microsoft Windows Operating Systems.  This alpha includes support for IPv6
on all platforms that support IPv6.

This version of Apache is known to work on many versions of Unix, BeOS,
OS/2, and Windows.  Because of many of the advancements in Apache 2.0,
the initial release of Apache is expected to perform equally well on all
supported platforms.

There are new snapshots of the Apache httpd source available every 6
hours from http://dev.apache.org/from-cvs/apache-2.0/ - please
download and test if you feel brave. We don't guarantee anything
except that it will take up disk space, but if you have the time and
skills, please give it a spin on your platforms.

Apache has been the most popular web server on the Internet since
April of 1996. The May 2000 WWW server site survey by Netcraft (see:

http://www.netcraft.co.uk/Survey/) found that more web servers were
using Apache than any other software running on more than 60% of the
Internet web servers.

For more information, please check out http://www.apache.org/httpd.html

Known problems with Apache 2.0.14

  *) WARNING: Apache 2.0b1 is not expected to run on Windows 95, 98 or ME.
     The intitial production release of Apache 2.0 is expected to run on
     these consumer operating systems, but they cannot be recommended as
     production environments due to the lack of integrated security and

  *) The canonical paths are being overhauled.  This affects especially
     Win32 users with this release.  Due to this transitional state,
     file with names containing non-ASCII characters may refuse serve.
     This is in preparation for the next release, users will be able to
     serve any Unicode named files with Apache/Win32 on Windows NT/2000.

  *) Win32 users will see no message when Apache 2.0b1 is started as a
     console.  While normal for unix, this differs from the behavior in
     Apache 1.3 on Windows.

Changes with Apache 2.0.14

  *) Fix content-length computation.  We ONLY compute a content-length if
     We are not in a 1.1 request and we cannot chunk, and this is a keepalive
     or we already have all the data.  [Ryan Bloom]

  *) Report unbounded containers in the config file.  Previously, a typo
     in the  directive could result in the rest of the config
     file being silently ignored, with undesired defaults used.
     [Jeff Trawick]

  *) Make the old_write filter use the ap_f* functions for the buffering.
     [Ryan Bloom]

  *) Move more code from the http module into the core server.  This
     is core code, basically the default handler, the default input
     and output filters, and all of the core configuration directives.
     All of this code is required in order for the server to work, with or
     without HTTP.  The server is closer to working without the HTTP

     module, although there is still more to do.  [Ryan Bloom]

  *) Fix a number of SGI compile warnings throughout the server.  Fix some
     bad parameters to apr_bucket_read().  Fix a bad statement in
     ap_method_in_list().  For the mod_rewrite cache use apr_time_t
     consistently; we were mixing apr_time_t and time_t in invalid ways
     before.  In load_file(), call apr_dso_error() instead of
     apr_strerror() so that we get a more specific string on some platforms.
     PR #6980  [Jeff Trawick]

  *) Allow modules to query the MPM about it's execution profile.  This
     query API can and should be extended in the future, but for now,
     max_daemons, and threading or forking is a very good start.
     [Jon Travis ]

  *) Modify mod_include to send blocks of data no larger than 9k.
     Without this, mod_include will wait until the whole file is parsed,
     or the first tag is found to send any data to the client.
     [Paul J. Reder ]

  *) Fix mod_info, so that  and  directives are
     not displayed twice when displaying the current configuration.
     [Ryan Morgan ]

  *) Add config directives to override DEFAULT_ERROR_MSG and
     DEFAULT_TIME_FORMAT.  This was sent in as PR 6193.
     [Dan Rench ]

  *) Get mod_info building and loading on Win32.  [William Rowe]

  *) Begin to move protocol independant functions out of mod_http.  The goal
     is to have only functions that are HTTP specific in the http directory.
     [Ryan Bloom]

Changes with Apache 2.0.13 (not released)

  *) Don't assume that there will always be multiple calls to the byterange
     filter.  It is possible that we will need to do byteranges with only
     one call to the filter.  [Ryan Morgan ]

  *) Move the error_bucket definition from the http module to the
     core server.  Every protocol will need this ability, not just
     HTTP.  [Ryan Bloom]

Changes with Apache 2.0.12 (not released)

  *) Modify mod_file_cache to save pre-formatted strings for
     content-length and last-modified headers for performance.
     [Mike Abbot ]

  *) Namespace protect IOBUFSIZ since it is exposed in the API.
     [Jon Travis ]

  *) Use "Basic" authentication instead of "basic" in ab, as the spec
     says we should.  [Andre Breiler ]

  *) Fix a seg fault in mod_userdir.c.  We used to use the pw structure
     without ever filling it out.  This fixes PR 7271.
     [Taketo Kabe  and
      Cliff Woolley ]

  *) Add a couple of GCC attribute tags to printf style functions.
     [Jon Travis ]

  *) Add the correct language tag for interoperation with the Taiwanese
     versions of MSIE and Netscape. [Clive Lin ] PR#7142

  *) Migrate the perchild MPM to use the new apr signal child, and
     APR thread functions.  [Ryan Bloom]

  *) Close one copy of the CGI's stdout before creating the new process.
     The CGI will still have stdout, because we have already dup'ed it.
     This keeps Apache from waiting forever to send the results of a CGI
     process that has forked a long-lived child process.
     [Taketo Kabe ]

  *) Remove the rest of the pthreads functions from the threaded MPM.
     This requires the APR support for a signal thread that was just
     added.  [Ryan Bloom]

  *) Make mod_dir use a fixup for sending a redirect to the browser.
     Before this, we were using a handler, which doesn't make much
     sense, because the handler wasn't generating any data, it would
     either return a redirect error code, or DECLINED.  This fits the
     current hooks better.  [Ryan Morgan ]

  *) Make the threaded MPM use APR threads instead of pthreads.
     [Ryan Bloom]

  *) Get mod_tls to the point where it actually appears to work in all cases.
     [Ben Laurie]

  *) implement --enable-modules and --enable-mods-shared for "all" and
     "most".  [Greg Stein]

  *) Move the threaded MPM to use APR locks instead of pthread locks.
     [Ryan Bloom]

  *) Rename mpmt_pthread to threaded.  This is more in line with the
     fact that mpmt_pthread shouldn't be using pthreads directly, and
     it is a smaller name that doesn't tie into anything.
     [Ryan Bloom]

  *) Rename the module structures so that the exported symbol matches
     the file name, and it is easier to automate the installation
     process (generating LoadModule directives from the module filenames).
     [Martin Kraemer]

  *) Remove the coalesce filter.  With the ap_f* functions, this filter
     is no longer needed. [Ryan Bloom]

Changes with Apache 2.0.11 (not released)

  *) Remove the dexter MPM.  Perchild is the same basic idea, but it has the
     added feature of allowing a uid/gid per child process.  If no
     uid/gid is specified, then Perchild behaves exactly like dexter.
     [Ryan Bloom]

  *) Get perchild building again. [Ryan Bloom]

  *) Don't disable threads just because we are using the prefork MPM.
     If somebody wants to compile without threads, they must now add
     --disable-threads to the configure command line.  [Ryan Bloom]

  *) Begin to move the calls to update_child_status into common code, so
     that each individual MPM does not need to update the scoreboard itself.
     [Ryan Bloom]

  *) Allow mod_tls to compile under Unix boxes where openssl has been
     installed to the system include files.
     [Gomez Henri ]

  *) Cleanup the mod_tls configure process.  This should remove any need
     to hand-edit any files.  We require OpenSSL 0.9.6 or later, but
     configure doesn't check that yet.  [Ryan Bloom]

  *) Add a very early prototype of SSL support (in mod_tls.c). It is

     vital that you read modules/tls/README before attempting to build
     it. [Ben Laurie]

  *) Fix a potential seg fault on all platforms.  David Reid fixed this
     on BEOS, but the problem could happen anywhere, so we don't want
     to #ifdef it. [Cliff Woolley ]

  *) Add new LogFormat directive, %D, to log time it takes to serve a
     request in microseconds. [Bill Stoddard]

  *) Change AddInputFilter and AddOutputFilter to SetInputFilter and
     SetOutputFilter.  This corresponds nicely with the other Set
     directives, which operate on containers while the Add* directives
     tend to work directly on extensions.  [Ryan Bloom]

  *) Cleanup the header handling a bit.  This uses the apr_brigade_*
     functions for the buffering so that we don't need to compute
     the length of the headers before we actually create the header
     buffer.  [Ryan Bloom]

  *) Allow filters to buffer data using the ap_f* functions.  These have
     become macros that resolve directly to apr_brigade_*.
     [Ryan Bloom]

  *) Get the Unix MPM's to do a graceful restart again.  If we are going
     to register a cleanup with ap_cleanup_scoreboard, then we have to
     kill the cleanup with the same function,  and that function can't be
     static.  [Ryan Bloom]

  *) Install all required header files.  Without these, it was not
     possible to compile some modules outside of the server.
     [Ryan Bloom]

  *) Fix the AliasMatch directive in Apache 2.0.  When we brought a patch
     forward from 1.3 to 2.0, we missed a single line, which broke regex
     aliases.  [Ryan Bloom]

  *) We have a poor abstraction in the protocol.  This is a temporary
     hack to fix the bug, but it will need to be fixed for real.  If
     we find an error while sending out a custom error response, we back
     up to the first non-OK request and send the data.  Then, when we send
     the EOS from finalize_request_protocol, we go to the last request,

     to ensure that we aren't sending an EOS to a request that has already
     received one.  Because the data is sent on a different request than
     the EOS, the error text never gets sent down the filter stack.  This
     fixes the problem by finding the last request, and sending the data
     with that request.  [Ryan Bloom]

  *) Make the server status page show the correct restart time, and
     thus the proper uptime. [Ryan Bloom]

  *) Move the CGI creation logic from mod_include to mod_cgi(d).  This
     should reduce the amount of duplicate code that is required to
     create CGI processes.
     [Paul J. Reder ]

  *) ap_new_connection() closes the socket and returns NULL if a socket
     call fails.  Usually this is due to a connection which has been
     reset.  [Jeff Trawick]

  *) Move the Apache version information out of httpd.h and into release.h.
     This is in preparation for the first tag with the new tag and release
     system.  [Ryan Bloom]

  *) Begin restructuring scoreboard code to enable adding back in
     the ability to use IPC other than shared memory.
     Get mod_status working on Windows again. [Bill Stoddard]

  *) Make mod_status work with 2.0.  This will work for prefork,
     mpmt_pthread, and dexter.  [Ryan Bloom]

  *) Correct a typo in httpd.conf.
     [Kunihiro Tanaka ] PR#7154

  *) Really fix mod_rewrite map lookups this time. [Tony Finch]

  *) Get the correct IP address if ServerName isn't set and we can't
     find a fully-qualified domain name at startup.
     PR#7170 [Danek Duvall ]

  *) Make mod_cgid work with SuExec.  [Ryan Bloom]

  *) Adopt apr user/group name features for mod_rewrite.  Eliminates some
     'extra' stat's for user/group since they should never occur, and now
     resolves the SCRIPT_USER and SCRIPT_GROUP, including on WinNT NTFS
     volumes.  [William Rowe]

  *) Adopt apr features to simplify mod_includes.  This changes the
     behavior of the USER_NAME variable, unknown uid's are now reported
     as USER_NAME="" rather than the old user#000 result.
     WinNT now resolves USER_NAME on NTFS volumes.  [William Rowe]

  *) Adopt apr features for simplifing mod_userdir, and accept the new
     Win32/OS2 exceptions without hiccuping.  [William Rowe]

  *) Replace configure --with-optim option by using and saving the
     environment variable OPTIM instead.  This is needed because configure
     options do not support multiple flags separated by spaces.
     [Roy Fielding]

  *) Fix some byterange handling.  If we get a byte range that looks like
     "-999999" where that is past the end of the file, we should return
     a PARTIAL CONTENT status code, and return the whole file as one big
     byterange.  This matches the 1.3 handling now.  [Ryan Bloom]

  *) Make the error bucket a real meta-data bucket.  This means that the
     bucket length is 0, and a read returns NULL data.  If one of these
     buckets is passed down after the headers are sent, this data will
     just be ignored.  [Greg Stein]

  *) The prefork MPM wasn't killing child processes correctly if a restart
     signal was received while the process was serving a request.  The child
     process would become the equivalent of a second parent process.  If
     we break out of the accept loop, then we need to do die after cleaning
     up after ourselves.  [Ryan Bloom]

  *) Change the Prefork MPM to use SIGWINCH instead of SIGUSR1 for graceful
     restarts.  [Ryan Bloom]

  *) Modify the apr_stat/lstat/getfileinfo calls within apache to use
     the most optimal APR_FINFO_wanted bits.  This spares Win32 from
     performing very expensive owner, group and permission lookups
     and allows the server to function until these apr_finfo_t fields
     are implemented under Win32.  [William Rowe]

  *) Support for typedsafe optional functions - that is functions exported by
     optional modules, which, therefore, may or may not be present, depending
     on configuration. See the experimental modules mod_optional_fn_{ex,im}port
     for sample code. [Ben Laurie]

  *) filters can now report an HTTP error to the server.  This is done
     by sending a brigade where the first bucket is an error_bucket.
     This bucket is a simple bucket that stores an HTTP error and
     a string.  Currently the string is not used, but it may be needed
     to output an error log.  The http_header_filter will find this
     bucket, and output the error text, and then return
     AP_FILTER_ERROR, which informs the server that the error web page
     has already been sent.  [Ryan Bloom]

  *) If we get an error, then we should remove all filters except for
     those critical to serving a web page.  This fixes a bug, where
     error pages were going through the byterange filter, even though
     that made no sense.  [Ryan Bloom]

  *) Relax the syntax checking of Host: headers in order to support
     iDNS. PR#6635 [Tony Finch]

  *) Cleanup the byterange filter to use the apr_brigade_partition
     and apr_bucket_copy functions.  This removes a lot of very messy
     code, and hopefully makes this filter more stable.
     [Ryan Bloom]

  *) Remove AddModule and ClearModuleList directives.  Both of these
     directives were used to ensure that modules could be enabled
     in the correct order.  That requirement is now gone, because
     we use hooks to ensure that modules are in the correct order.
     [Ryan Bloom]

  *) When SuExec is specified, we need to add it to the list of
     targets to be built.  If we don't, then any changes to the
     configuration won't affect SuExec, unless 'make suexec' is
     specifically run.  [Ryan Bloom]

  *) Cleaned out open_file from mod_file_cache, as apr now accepts
     the APR_XTHREAD argument to open a file for consumption by

     parallel threads on win32.  [William Rowe]

  *) Correct a bug in determining when we follow symlinks.  The code
     expected a stat -1 result, not an apr_status_t positive error.
     Also check if the APR_FINFO_USER fields are valid before we
     follow the link.  [William Rowe]

  *) Move initgroupgs, ap_uname2id and ap_gname2id from util.c to
     mpm_common.c.  These functions are only valid on some platforms,
     so they should not be in the main-line code. [Ryan Bloom]

  *) Remove ap_chdir_file().  This function is not thread-safe,
     and nobody is currently using it.  [Ryan Bloom]

  *) Do not try to run make depend if there are no .c files in the
     current directory, doing so makes 'make depend' fail.
     [Ryan Bloom]

   *) Update highperformance.conf to work with either prefork or
      pthreads mpms.  [Greg Ames]

  *) Stop checking to see if this is a pipelined request if we know
     for a fact that it isn't.  Basically, if r->connection->keepalive == 0.
     This keeps us from making an extra read call when serving a 1.0
     request.  [Ryan Bloom and Greg Stein]

  *) Fix the handling of variable expansion look-ahead in mod_rewrite,
     i.e. syntax like %{LA-U:REMOTE_USER}, and also fix the parsing of
     more complicated nested RewriteMap lookups. PR#7087 [Tony Finch]

  *) Fix the RFC number mentioned when complaining about a missing
     Host: header. PR#7079 [Alexey Toptygin ]

  *) Fix an endless loop in ab which occurred when ab was posting
     and the server dropped the connection unexpectedly.
     [Jeff Trawick]

  *) Fix a segfault while handling request bodies in ap_http_filter().
     This problem has been seen with mod_dav usage as well as with
     requests where the body was just being discarded.  [Jeff Trawick]

  *) Some adjustment on the handling and automatic setting (via
     hints.m4) of various compilation flags (eg: CFLAGS). Also,

     add the capability to specify flags (NOTEST_CFLAGS and
     NOTEST_LDFLAGS) which are used to compile Apache, but
     not used during the configuration process. Useful for
     flags like "-Werror". [Jim Jagielski]

  *) Stop using environment variables to force debug mode or
     no detach.  We now use the -D command line argument to
     specify the correct mode.  -DONE_PROCESS and -DNO_DETACH.
     [Greg Stein, Ryan Bloom]

  *) Change handlers to use hooks. [Ben Laurie]

  *) Stop returning copies of filenames from both apr_file_t and
     apr_dir_t.  We pstrdup the filenames that we store in the
     actual structures, so we don't need to pstrdup the strings again.
     [Ryan Bloom]

  *) mod_cgi: Fix some problems where the wrong error value was being
     traced.  [Jeff Trawick]

  *) EBCDIC: Fix some missing ASCII conversion on some protocol data.
     [Jeff Trawick]

  *) Add generic hooks. [Ben Laurie]

  *) Use a real pool to dup the error log descriptor.  [Ryan Bloom]

  *) Fix a segfault caused by mod_ext_filter when the external filter
     program does not exist. [Jeff Trawick]

  *) Fix an output truncation error when on an HTTP >= 1.0 request an
     object of size between DEFAULT_BUCKET_SIZE and AP_MIN_BYTES_TO_WRITE
     was served through mod_charset_lite (or anything else that would
     create a transient bucket in this size range).  ap_bucket_make_heap()
     silently failed (fixed), transient_setaside() discovered it, but
     ap_save_brigade() ignored it (fixed). [Jeff Trawick]

  *) Ignore \r\n or \n when using PEEK mode for input filters.  The problem
     is that some browsers send extra lines at the end of POST requests, and
     we don't want to delay sending data back to the user just because the
     browser isn't well behaved. [Ryan Bloom]

  *) Get SuEXEC working again.  We can't send absolute paths to suExec
     because it refuses to execute those programs.  SuEXEC also wasn't

     always recognizing configuration changes made using the autoconf
     setup.  [Ryan Bloom]

  *) Allow the buildconf process to find the config.m4 files in the correct
     order.  Basically, we can now name config.m4 files as config\d\d.m4,
     and we will sort them correctly when inserting them into the build
     process.  [Ryan Bloom]

  *) Get mod_cgid to use apr calls for creating the actual CGI process.
     This also allows mod_cgid to use ap_os_create_priviledged_process,
     thus allowing for SuExec execution from mod_cgid.  Currently, we do
     not support everything that standard SuExec supports, but at least
     it works minimally now. [Ryan Bloom]

  *) Allow SuExec to be configured from the ./configure command line.
     [Ryan Bloom]

  *) Update some of the docs in README and INSTALL to reflect some of
     the changes in Apache 2.0 [Cliff Woolley ]

  *) If we get EAGAIN returned from the call to apr_sendfile, then we
     need to call sendfile again.  This gets us serving large files
     such as apache_2.0a9.tar.gz on FreeBSD again. [Ryan Bloom]

  *) Get the support programs building cleanly again.
     [Cliff Woolley ]

  *) The Apache/Win32 Apache.exe and dll's now live in bin.  The
     current directory logic now backs up over bin/ to determine the
     server root from the Apache.exe path.

  *) Apache/Win32 now follows the standard conventions of mod_foo.so
     loadable modules, dynamic libs are all named libfoo.dll, and the
     makefile.win populates the include, lib and libexec directories.

  *) Apache is now IPv6-capable.  On systems where APR supports IPv6,
     Apache gets IPv6 listening sockets by default.  Additionally, the
     Listen, NameVirtualHost, and  directives support IPv6
     numeric address strings (e.g., "Listen [fe80::1]:8080").
     [Jeff Trawick]

  *) Modify the install directory layout.  Modules are now installed in

     modules/.  Shared libraries should be installed in libraries/, but
     we don't have any of those on Unix yet.  All install directories
     are modifyable at configure time. [Ryan Bloom]

  *) Install all header files in the same directory on Unix. [Ryan Bloom]

  *) Get the functions in server/linked into the server, regardless of
     which modules linked into the server.  This uses the same hack
     for Apache that we use for APR and apr-util to ensure all of the
     necessary functions are linked.  As a part of thise, the CHARSET_EBCDIC
     was renamed to AP_CHARSET_EBCDIC for namespace protection, and to make
     the scripts a bit easier.
     [Ryan Bloom]

  *) Rework the RFC1413 handling to make it thread-safe, use a timeout
     on the query, and remove IPv4 dependencies.  [Jeff Trawick]

  *) Get all of the auth modules to the point that they will install and
     be loadable into the server.  Our new build/install mechanism expects
     that all modules will have a common name format.  The auth modules
     didn't use that format, so we didn't install them properly.
     [Ryan Bloom]

  *) API routines ap_pgethostbyname() and ap_pduphostent() are no longer
     available.  Use apr_getaddrinfo() instead.  [Jeff Trawick]

  *) Get "NameVirtualHost *" working in 2.0.  [Ryan Bloom]

  *) Return HTTP_RANGE_NOT_SATISFIABLE if the every range requested starts
     after the end of the response. [Ryan Bloom]

  *) Get byterange requests working with responses that do not have a
     content-length.  Because of the way byterange requests work, we have to
     have all of the data before we can actually do the byterange, so we
     can compute the content-length in the byterange filter.
     [Ryan Bloom]

  *) Get exe CGI's working again on Windows.
     [Allan Edwards]

  *) Get mod_cgid and mod_rewrite to work as DSOs by changing the way
     they keep track of whether or not their  post config hook has been

     called before.  Instead of a static variable (which is replaced when
     the DSO is loaded a second time), use userdata in the process pool.
     [Jeff Trawick]

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