Release 4.0.37
--------------

 * Improved Node.js compatibility. Calling on() on the request object
   now returns the request object itself. This fixes some issues with
   Express, Connect and Formidable. Furthermore, some WebSocket-related
   issues have been fixed.
 * Improved Meteor support. Meteor application processes are now shut down
   quicker. Previously, they linger around for 5 seconds while waiting for
   all connections to terminate, but that didn't work well because WebSocket
   connections were kept open indefinitely. Also, some WebSocket-related
   issues have been fixed.
 * Introduced a new tool `passenger-config detach-process` for gracefully
   detaching an application process from the process pool. Has a similar
   effect to killing the application process directly with `kill <PID>`,
   but killing directly may cause the HTTP client to see an error, while
   using this command guarantees that clients see no errors.
 * Fixed a crash occurs when an application fails to spawn, but the HTTP
   client disconnects before the error page is generated. Fixes issue #1028.
 * Fixed a symlink-related security vulnerability.

   Urgency: low
   Scope: local exploit
   Summary: writing files to arbitrary directory by hijacking temp directories
   Affected versions: 4.0.5 and later
   Fixed versions: 4.0.37

   Description:
   Phusion Passenger creates a "server instance directory" in /tmp during startup,
   which is a temporary directory that Phusion Passenger uses to store working files.
   This directory is deleted after Phusion Passenger exits. For various technical
   reasons, this directory must have a semi-predictable filename. If a local attacker
   can predict this filename, and precreates a symlink with the same filename that
   points to an arbitrary directory with mode 755, owner root and group root, then
   the attacker will succeed in making Phusion Passenger write files and create
   subdirectories inside that target directory. The following files/subdirectories
   are created:

    * control_process.pid
    * generation-X, where X is a number.

   If you happen to have a file inside the target directory called `control_process.pid`,
   then that file's contents are overwritten.

   These files and directories are deleted during Phusion Passenger exit. The target
   directory itself is not deleted, nor are any other contents inside the target
   directory, although the symlink is.

   Thanks go to Jakub Wilk for discovering this issue.


Release 4.0.36
--------------

 * [Enterprise] Fixed some Mass Deployment bugs.
 * [Enterprise] Fixed a bug that causes an application group to be put into
   Deployment Error Resistance Mode if rolling restarting fails while
   deployment error resistance is off. Deployment Error Resistance Mode is
   now only activated if it's explicitly turned on.
 * Passenger Standalone now gzips JSON responses.
 * Fixed some cases in which Passenger Standalone does not to properly cleanup
   its temporary files.


Release 4.0.35
--------------

 * Fixed some unit tests.


Release 4.0.34
--------------

 * The Node.js loader code now sets the `isApplicationLoader` attribute on the
   bootstrapping module. This provides a way for apps and frameworks that check
   for `module.parent` to check whether the current file is loaded by Phusion
   Passenger, or by other software that work in a similar way.

   This change has been introduced to solve a compatibility issue with CompoundJS.
   CompoundJS users should modify their server.js, and change the following:

       if (!module.parent) {

   to:

       if (!module.parent || module.parent.isApplicationLoader) {

 * Improved support for Meteor in development mode. Terminating Phusion Passenger
   now leaves less garbage Meteor processes behind.
 * It is now possible to disable the usage of the Ruby native extension by setting
   the environment variable `PASSENGER_USE_RUBY_NATIVE_SUPPORT=0`.
 * Fixed incorrect detection of the Apache MPM on Ubuntu 13.10.
 * When using RVM, if you set PassengerRuby/passenger_ruby to the raw Ruby binary
   instead of the wrapper script, Phusion Passenger will now print an error.
 * Added support for RVM >= 1.25 wrapper scripts.
 * Fixed loading passenger_native_support on Ruby 1.9.2.
 * The Union Station analytics code now works even without native_support.
 * Fixed `passenger-install-apache2-module` and `passenger-install-nginx-module` in
   Homebrew.
 * Binaries are now downloaded from an Amazon S3 mirror if the main binary server
   is unavailable.
 * And finally, although this isn't really a change in 4.0.34, it should be noted.
   In version 4.0.33 we changed the way Phusion Passenger's own Ruby source files
   are loaded, in order to fix some Debian and RPM packaging issues. The following
   doesn't work anymore:

       require 'phusion_passenger/foo'

   Instead, it should become:

       PhusionPassenger.require_passenger_lib 'foo'

   However, we overlooked the fact that this change breaks Ruby apps which use
   our Out-of-Band GC feature, because such apps had to call
   `require 'phusion_passenger/rack/out_of_band_gc'`. Unfortunately we're not able
   to maintain compatibility without reintroducing the Debian and RPM packaging
   issues. Users should modify the following:

       require 'phusion_passenger/rack/out_of_band_gc'

   to:

       if PhusionPassenger.respond_to?(:require_passenger_lib)
         # Phusion Passenger >= 4.0.33
         PhusionPassenger.require_passenger_lib 'rack/out_of_band_gc'
       else
         # Phusion Passenger < 4.0.33
         require 'phusion_passenger/rack/out_of_band_gc'
       end

Release 4.0.33
--------------

 * Fixed a compatibility problem in passenger-install-apache2-module with Ruby 1.8.
   The language selection menu didn't work properly.


Release 4.0.32
--------------

 * Fixed compatibility problems with old Ruby versions that didn't include RubyGems.


Release 4.0.31
--------------

 * Introduced a new tool: `passenger-config restart-app`. With this command you
   can initiate an application restart without touching restart.txt.
   Unlike touching restart.txt, this tool initiates the restart immediately
   instead of on the next request.
 * Fixed some problems in process spawning and request handling.
 * Fixed some problems with the handling of HTTP chunked transfer encoding
   bodies. These problems only occurred in Ruby.
 * Fixed the HelperAgent, upon shutdown, not correctly waiting 5 seconds until
   all clients have disconnected. Fixes issue #884.
 * Fixed compilation problems on FreeBSD.
 * Fixed some C++ strict aliasing problems.
 * Fixed some problems with spawning applications that print messages without
   newline during startup. Fixes issue #1039.
 * Fixed potential hangs on JRuby when Ctrl-C is used to shutdown the server.
   Fixes issue #1035.
 * When Phusion Passenger is installed through the Debian package,
   passenger-install-apache2-module now checks whether the Apache
   module package (libapache2-mod-passenger) is properly installed,
   and installs it using apt-get if it's not installed. Fixes
   issue #1031.
 * The `passenger-status --show=xml` command no longer prints the non-XML
   preamble, such as the version number and the time. Fixes issue #1037.
 * The Ruby native extension check whether it's loaded against the right Ruby
   version, to prevent problems when people upgrade Ruby without recompiling
   their native extensions.
 * Various other minor Debian packaging improvements.


Release 4.0.30
--------------

 * Fixed wrong autogeneration of HTTP Date header. If the web app does
   not supply a Date header, then Passenger will add one. Unfortunately
   due to the use of the wrong format string, December 30 2013 is
   formatted as December 30 2014. As a result, cookies that expire before
   2014 would expire on December 30 2013 and December 31 2013. Details can
   be found at [Github pull request 93](https://github.com/phusion/passenger/pull/93).

   This issue only affects Phusion Passenger for Nginx and Phusion Passenger
   Standalone, and does not affect Phusion Passenger for Apache.

   You can work around this problem in your application by setting a
   Date header. For example, in Rails you can do:

       before_filter { response.date = Time.now.utc }

   Many thanks to Jeff Michael Dean (zilkey) and many others for bringing this to our attention and for providing workarounds and feedback.


Release 4.0.29
--------------

 * Fixed a compilation problem on OS X Mavericks.


Release 4.0.28
--------------

 * Introduced a workaround for a GCC 4.6 bug. This bug could cause Phusion
   Passsenger to crash during startup. Affected operating systems include
   Ubuntu 12.04 and Amazon Linux 2013.09.01, though not every machine with
   this OS installed exhibits the problem. See issue #902.
 * Improved Node.js support: the Sails framework is now supported.
 * Improved Node.js support: the streams2 API is now supported.
 * Introduced support for hooks, allowing users to easily extend Phusion
   Passenger's behavior.
 * Fixed a bug in the `passenger start -R` option. It was broken because of a
   change introduced in 4.0.25.
 * Fixed a bug in PassengerMaxInstancesPerApp. Fixes issue #1016.
 * Fixed compilation problems on Solaris.
 * Fixed an encoding problem in the Apache autodetection code. Fixes
   issue #1026.
 * The Debian packages no longer depend on libruby.
 * Application stdout and stderr are now printed without normal
   Phusion Passenger debugging information, making them easier to read.


Release 4.0.27
--------------

 * [Apache] Fixed a bug in the Apache module which could lock up the Apache
   process or thread. This is a regression introduced in version 4.0.24.
 * Node.js application processes now have friendly process titles.


Release 4.0.26
--------------

 * Introduced the `PassengerBufferUpload` option for Apache. This option allows one
   to disable upload buffering, e.g. in order to be able to track upload progress.
 * [Nginx] The `HTTPS` variable is now set correctly for HTTPS connections, even
   without setting `ssl on`. Fixes issue #401.
 * [Standalone] It is now possible to listen on both a normal HTTP and an HTTPS port.
 * [Enterprise] The `passenger-status` tool now displays rolling restart status.


Release 4.0.25
--------------

 * The `PassengerAppEnv`/`passenger_app_env`/`--environment` option now also sets NODE_ENV,
   so that Node.js frameworks like Connect can properly respond to the environment.
 * Fixed a bug in our Debian/Ubuntu packages causing `passenger-install-nginx-module`
   not to be able to compile Nginx.
 * Arbitrary Node.js application structures are now supported.
 * [Nginx] Introduced the `passenger_restart_dir` option.
 * [Nginx] Upgraded preferred Nginx version to 1.4.4 because of CVE-2013-4547.


Release 4.0.24
--------------

 * Introduced the `PassengerNodejs` (Apache) and `passenger_nodejs` (Nginx)
   configuration options.
 * [Apache] Introduced the `PassengerErrorOverride` option, so that HTTP error
   responses generated by applications can be intercepted by Apache and customized
   using the `ErrorDocument` directive.
 * [Standalone] It is now possible to specify some configuration options in
   a configuration file `passenger-standalone.json`. When Passenger Standalone
   is used in Mass Deployment mode, this configuration file can be used to customize
   settings on a per-application basis.
 * [Enterprise] Fixed a potential crash when a rolling restart is triggered
   while a process is already shutting down.
 * [Enterprise] Fixed Mass Deployment support for Node.js and Meteor.


Release 4.0.23
--------------

 * Fixed compilation problems on GCC 4.8.2 (e.g. Arch Linux 2013-10-27).
 * Fixed a compatibility problem with Solaris /usr/ccs/bin/make: issue #999.
 * Support for the Meteor Javascript framework has been open sourced.


Release 4.0.22
--------------

 * [Enterprised] Fixed compilation problems on OS X Mavericks.


Release 4.0.21
--------------

 * [Nginx] Upgraded the preferred Nginx version to 1.4.3.
 * Node.js support has been open sourced.
 * Prelimenary OS X Mavericks support.
 * Work around an Apache packaging bug in CentOS 5.
 * Various user friendliness improvements in the documentation and the
   installers.
 * Fixed a bug in the always_restart.txt support. Phusion Passenger was
   looking for it in the wrong directory.
 * Many Solaris and Sun Studio compatibility fixes. Special thanks to
   "mark" for his extensive assistance.
 * [Standalone] The --temp-dir command line option has been introduced.


Release 4.0.20
--------------

 * Fixed a bug in Phusion Passenger Standalone's daemon mode. When in daemon
   mode, the Nginx temporary directory was deleted prematurely, causing some
   POST requests to fail. This was a regression that was introduced in 4.0.15
   as part of an optimization.
 * Fixed compilation problems on Solaris 10 with Sun Studio 12.3.
 * Improved detection of RVM problems.
 * It is now possible to log the request method to Union Station.
 * Introduced a new option, `PassengerLoadShellEnvvars` (Apache) and
   `passenger_load_shell_envvars` (Nginx). This allows enabling or disabling
   the loading of bashrc before spawning the application.
 * [Enterprise] Fixed a packaging problem which caused the flying-passenger
   executable not to be properly included in the bin path.
 * [Enterprise] Fixed a race condition which sometimes causes the Flying
   Passenger socket to be deleted after a restart. Fixes issue #939.
 * [Enterprise] The `byebug` gem is now supported for debugging on Ruby 2.0.
   The byebug gem requires a patch before this works:
   https://github.com/deivid-rodriguez/byebug/pull/29


Release 4.0.19
--------------

 * Fixed a problem with response buffering. Application processes are now
   properly marked available for request processing immediately after they're
   done sending the response, instead of after having sent the entire response
   to the client.
 * The "processed" counter in `passenger-status` is now bumped after the process
   has handled a request, not at the beginning.
 * [Enterprise] Fixed an off-by-one bug in the `passenger_max_processes` setting.


Release 4.0.18
--------------

 * The Enterprise variant of Phusion Passenger Standalone now supports
   customizing the concurrency model and thread count from the command line.
 * On Nginx, the Enterprise license is now only checked if Phusion Passenger
   is enabled in Nginx. This allows you to deploy Nginx binaries, that have
   Phusion Passenger Enterprise compiled in, to servers that are not
   actually running Phusion Passenger Enterprise.
 * Fixed a performance bug in the Union Station support code. In certain cases
   where a lot of data must be sent to Union Station, the code is now over
   100 times faster.
 * `passenger-status --show=union_station` now displays all clients that
   are connected to the LoggingAgent.
 * Added a workaround for Heroku so that exited processes are properly detected
   as such.
 * When using Phusion Passenger Standalone with Foreman, pressing Ctrl-C
   in Foreman no longer results in runaway Nginx processes.
 * Fixed backtraces in the Apache module.


Release 4.0.17
--------------

 * Fixed compilation problems on GCC 4.8 systems, such as Arch Linux 2013.04.
   Fixes issue #941.
 * Fixed some deprecation warnings when compiling the Ruby native extension
   on Ruby 2.0.0.
 * Fixed some Union Station-related stability issues.


Release 4.0.16
--------------

 * Allow Phusion Passenger to work properly on systems where the user's GID
   does not have a proper entry in /etc/group, such as Heroku.


Release 4.0.15
--------------

 * Out-of-band work has been much improved. The number of processes which
   may perform out-of-band work concurrently has been limited to 1.
   Furthermore, processes which are performing out-of-band work are now
   included in the max pool size constraint calculation. However, this
   means that in order to use out-of-band work, you need to have at least
   2 application processes running. Out-of-band work will never be triggered
   if you just have 1 process. Partially fixes issue #892.
 * Phusion Passenger now displays an error message to clients if too many
   requests are queued up. By default, "too many" is 100. You may customize
   this with `PassengerMaxRequestQueueSize` (Apache) or
   `passenger_max_request_queue_size` (Nginx).
 * A new configuration option, `PassengerStartTimeout` (Apache) and
   `passenger_start_timeout` (Nginx), has been added. This option allows you
   to specify a timeout for application startup. The startup timeout has exited
   since version 4.0.0, but before version 4.0.15 it was hardcoded at a value
   of 90 seconds. Now it is customizable. Fixes issue #936.
 * [Enterprise] The `PassengerMaxRequestTime`/`passenger_max_request_time`
   feature is now available for Python and Node.js as well, and is no longer
   limited to just Ruby. Fixes issue #938.
 * [Nginx] Introduced a configuration option `passenger_intercept_errors`,
   which decides if Nginx will intercept responses with HTTP status codes of
   400 and higher. Its effect is similar to `proxy_intercept_errors`.
 * [Standalone] Memory usage optimization: when `passenger start` is run with
   `--daemonize`, the frontend exits after starting the Nginx core. This saves
   ~20 MB of memory per `passenger start` instance.
 * [Standalone] Phusion Passenger Standalone is now also packaged in the
   Debian packages.
 * [Standalone] Fix a problem with the `passenger stop` command on Ruby 1.8.7.
   The 'thread' library was not properly required, causing a crash.
 * [Standalone] There is now builtin support for SSL.
 * Fix a crash when multiple `passenger_pass_header` directives are set.
   Fixes issue #934.
 * Permissions on the server instance directory are now explicitly set
   with chmod, so that permissions are correct on systems with a non-default
   umask. Fixes issue #928.
 * Fix permission problems when running `passenger start` with `--user`.
 * `passenger-config --detect-apache2` now correctly detects the eror log
   filename on Amazon Linux. Fixes issue #933.
 * An environment variable `PASSENGER_THREAD_LOCAL_STORAGE` has been added
   to the build system for forcefully disabling the use of thread-local
   storage within the Phusion Passenger codebase. This flag useful on systems
   that have broken support for thread-local storage, despite passing our build
   system's check for proper thread-local storage support. At the time of
   writing, one user has reported that Ubuntu 12.04 32-bit has broken
   thread-local storage report although neither the reporter nor us were able
   to reproduce the problem on any other systems running Ubuntu 12.04 32-bit.
   Note that this flag has no effect on non-Phusion Passenger code. Fixes
   issue #937.
 * It is now possible to preprocess events before they are sent to Union
   Station. This is useful for removing confidential data as demonstrated in
   this example `config/initializers/passenger.rb` file:

       if defined?(PhusionPassenger)
           event_preprocessor = lambda do |e|
               e.payload[:sql].gsub!("secret","PASSWORD") if e.payload[:sql]
           end
           PhusionPassenger.install_framework_extensions!(:event_preprocessor => event_preprocessor)
       end

Release 4.0.14
--------------

 * Fixed a bug in Passenger Standalone's source compiler, for the specific
   case when the downloaded Nginx binary doesn't work, and compilation
   of the Nginx binary did not succeed the first time (e.g. because of
   missing dependencies).
 * Precompiled Ruby native extensions are now automatically downloaded.


Release 4.0.13
--------------

 * Updated preferred Nginx version to 1.4.2.
 * Worked around the fact that FreeBSD 9.1 has a broken C++ runtime. Patch
   contributed by David Keller.
 * Autogenerated HTTP Date headers are now in UTC instead of local time.
   This could cause cookies to have the wrong expiration time. Fixes issue #913.
 * Fixed compatibility problems with Ruby 1.8.6 (issue #924).
 * Introduced a tool, `passenger-config --detect-apache2`, which autodetects
   all Apache installations on the system along with their parameters (which
   apachectl command to run, which log file to read, which config file to edit).
   The tool advises users about how to use that specific Apache installation.
   Useful if the user has multiple Apache installations but don't know about
   it, or when the user doesn't know how to work with multiple Apache
   installations.
 * Added an API for better Rack socket hijacking support.
 * Added a hidden configuration option for customizing the application start
   timeout. A proper configuration option will be introduced in the future.
 * Added autodetection support for Amazon Linux.
 * Fixed process metrics collection on some operating systems. Some systems'
   'ps' command expect no space between -p and the list of PIDs.


Release 4.0.10
--------------

 * Fixed a crash in PassengerWatchdog which occurs on some OS X systems.
 * Fixed exception reporting to Union Station.
 * Improved documentation.


Release 4.0.9
-------------

 * [Enterprise] Fixed a problem with passenger-irb.


Release 4.0.8
-------------

 * Fixed a problem with graceful web server restarts. When you gracefully
   restart the web server, it would cause Phusion Passenger internal sockets
   to be deleted, thus causing Phusion Passenger to go down. This problem
   was introduced in 4.0.6 during the attempt to fix issue #910.
 * The PassengerRestartDir/passenger_restart_dir now accepts relative
   filenames again, just like in Phusion Passenger 3.x. Patch
   contributed by Ryan Schwartz.
 * Documentation updates contributed by Gokulnath Manakkattil.
 * [Enterprise] Fixed a license key checking issue on some operating systems,
   such as CentOS 6.


Release 4.0.7
-------------

 * There was a regression in 4.0.6 that sometimes prevents
   PassengerLoggingAgent from starting up. Unfortunately this slipped
   our release testing. This regression has been fixed and we've updated
   our test suite to check for these kinds of regressions.


Release 4.0.6
-------------

 * Fixed a potential 100% CPU lock up in the crash handler, which only occurs
   on OS X. Fixes issue #908.
 * Fixed a crash in request handling, when certain events are trigger after
   the client has already disconnected. Fixes issue #889.
 * Phusion Passenger will no longer crash when the Phusion Passenger
   native_support Ruby extension cannot be compiled, e.g. because the Ruby
   development headers are not installed or because the current user has no
   permission to save the native extension file. Fixes issue #890.
 * Fixed OS X 10.9 support. Fixes issue #906.
 * Removed dependency on bash, so that Phusion Passenger works out of the box
   on BSD platforms without installing/configuring bash. Fixes issue #911.
 * Fix 'PassengerPoolIdleTime 0' not being respected correctly. Issue #904.
 * Admin tools improvement: it is now possible to see all currently running
   requests by invoking `passenger-status --show=requests`.
 * A new feature called Flying Passenger allows you to decouple the life time
   of Phusion Passenger from the web server, so that both can be restarted
   indepedently from each other. Please refer to
   http://blog.phusion.nl/2013/07/03/technology-preview-introducing-flying-passenger/
   for an introduction.
 * [Apache] Fixed compatibility with Apache pipe logging. Previously this
   would cause Phusion Passenger to lock up with 100% CPU during Apache
   restart.
 * [Nginx] The Nginx configure script now checks whether 'ruby' is in $PATH.
   Previously, if 'ruby' is not in $PATH, then the compilation process fails
   with an obscure error.
 * [Nginx] passenger-install-nginx-module now works properly even when Phusion
   Passenger is installed through the Debian packages. Before, the installer
   would tell you to install Phusion Passenger through the gem or tarball
   instead.
 * [Enterprise] Added pretty printing helpers to the Live IRB Console.
 * Fixed permissions on a subdirectory in the server instance directory. The
   server instance directory is a temporary directory that Phusion Passenger
   uses to store working files, and is deleted after Phusion Passenger exits.
   A subdirectory inside it is world-writable (but not world-readable) and is
   used for storing Unix domain sockets created by different apps, which may
   run as different users. These sockets had long random filenames to prevent
   them from being guessed. However because of a typo, this subdirectory was
   created with the setuid bit, when it should have sticky bit (to prevent
   existing files from being deleted or renamed by a user that doesn't own the
   file). This has now been fixed.
 * If the server instance directory already exists, it will now be removed
   first in order get correct directory permissions. If the directory still
   exists after removal, Phusion Passenger aborts to avoid writing to a
   directory with unexpected permissions. Fixes issue #910.
 * The installer now checks whether the system has enough virtual memory, and
   prints a helpful warning if it doesn't.
 * Linux/AArch64 compatibility fixes. Patch contributed by Dirk Mueller.
 * Improved documentation.


Release 4.0.5
-------------

 * [Standalone] Fixed a regression that prevented Passenger Standalone
   from starting. Fixes issue #899.
 * Fixed security vulnerability CVE-2013-2119.

   Urgency: low
   Scope: local exploit
   Summary: denial of service and arbitrary code execution by hijacking temp files
   Affected versions: all versions
   Fixed versions: 3.0.21 and 4.0.5

   Description:
   Phusion Passenger's code did not always create temporary files and directories in a secure manner. Temporary files and directories were sometimes created with a predictable filename. A local attacker can pre-create temporary files, resulting in a denial of service. In addition, this vulnerability allows a local attacker to run arbitrary code as another user, by hijacking temporary files.

   By pre-creating certain temporary files with certain permissions, attackers can prevent Passenger Standalone from starting (denial of service).

   By pre-creating certain temporary files with certain other permissions, attackers can trick `passenger start` and the build system (which is invoked by `passenger-install-apache2-module`/`passenger-install-nginx-module`) to run arbitrary code. The user that the code is run as, is equal to the user that ran `passenger start` or the build system. Attacks of this nature have to be timed exactly right. The attacker must overwrite the file contents right after Phusion Passenger has created the file contents, but right before the file is used. In the context of `passenger start`, the vulnerable window begins right after Passenger Standalone has created the Nginx config file, and ends when Nginx has read the config file. Once Nginx has started and initialized, the system is no longer vulnerable. `passenger stop` and other Passenger Standalone commands besides `start` are not vulnerable. In the context of the build system, the vulnerable window begins when `passenger-install-apache2-module`/`passenger-install-nginx-module` prints its first dependency checking message, and ends when it prints the first compiler command.

   Only the `passenger start` command, the `passenger-install-apache2-module` command and the `passenger-install-nginx-module` commands are vulnerable. Phusion Passenger for Apache and Phusion Passenger for Nginx (once they are installed) are not vulnerable.

   Fixed versions:
   3.0.21 and 4.0.5 have been released to address this issue.

   Workaround:
   You can use this workaround if you are unable to upgrade. Before invoking any Phusion Passenger command, set the `TMPDIR` environment variable to a directory that is not world-writable. Special care must be taken when you use sudo: sudo resets all environment variables, so you should either invoke sudo with `-E`, or you must set the environment variable after gaining root privileges with sudo.


Release 4.0.4
-------------

 * Fixed autodetection of noexec-mount /tmp directory. Fixes issue #850
   and issue #625.
 * Fixed a WSGI bug. wsgi.input was a file object opened in text mode,
   but should be opened in binary mode. Fixes issue #881.
 * Fixed a potential crash in Out-of-Band Work. Fixes issue #894.
 * Fixed a potential crash in rolling restarting, which only occurs if a
   process was also being spawned at the same time. Fixes issue #896.
 * [Apache] The RailsBaseURI and RackBaseURI directives have been unified.
   For a long time, RailsBaseURI told Phusion Passenger that the given
   sub-URI belongs to a **Rails 2** application. Attempt to use this
   directive with Rails 3 or with Rack applications would result in an
   error. Because this confused users, RailsBaseURI and RackBaseURI
   have now been unified and can now be used interchangably. Phusion
   Passenger will automatically detect what kind of application it is.
   The Nginx version already worked like this. Fixes issue #882.
 * [Standalone] The Passenger Standalone temp directory and
   PassengerWatchdog server instance directory have been unified.
   PassengerWatchdog already automatically updates the timestamps of
   all files in its server instance directory every 6 hours to prevent
   /tmp cleaners from deleting the directory. Therefore this
   unification prevents the Passenger Standalone temp directory to be
   deleted by /tmp cleaners as well. Fixes issue #654.
 * [Standalone] types_hash_max_size has been increased from 1024 to
   2048. This solves a problem that causes Nginx not to start on some
   platforms. Contributed by Jan-Willem Koelewijn.


Release 4.0.3
-------------

 * Better protection is now provided against application processes that
   are stuck and refuse to shut down cleanly. Since version 4.0.0,
   Phusion Passenger already forcefully shuts down all processes during
   web server shutdown. In addition to this, 4.0.3 now also forcefully
   shuts down processes that take more than 1 minute to shut down, even
   outside the context of web server shutdowns. This feature does not,
   however, protect against requests that take too long. Use
   PassengerMaxRequestTime (Apache) or passenger_max_request_time (Nginx)
   for that.
 * Fixed a crash in the HelperAgent which results in frequent process
   restarts in some traffic patterns. Fixes issue #862.
 * Fixed a problem that prevents processes from being spawned correctly
   if the user's bashrc changes working directory. Fixes issue #851.
 * passenger-status now also displays CPU usage.
 * The installer now checks for checksums when automatically downloading
   PCRE and Nginx. Contributed by Joshua Lund.
 * An error is now printed when trying to daemonize Phusion Passenger
   Standalone on Ruby implementations that don't support forking.
   Contributed by Benjamin Fleischer.
 * Although Phusion Passenger already supported JRuby, *installing*
   Phusion Passenger with JRuby was not possible. This has been fixed.
 * Various other minor bug fixes.


Release 4.0.2
-------------

 * Bumped the preferred Nginx version to 1.4.1 because of a critical
   Nginx security vulnerability, CVE-2013-2028. Users are advised to
   upgrade immediately.


Release 4.0.1
-------------

 * Fixed a crasher bug in the Deployment Error Resistance feature.
 * Fixed a bug in PassengerDefaultUser and PassengerDefaultGroup.
 * Fixed a bug which could cause application processes to exit before
   they've finished their request.
 * Fixed some small file descriptor leaks.
 * Bumped the preferred Nginx version to 1.4.0.
 * Editing the Phusion Passenger Standalone Nginx config template
   is no longer discouraged.
 * Improved documentation.


Release 4.0.0 release candidate 6
---------------------------------

 * WebSocket support on Nginx. Requires Nginx >= 1.3.15.
 * Improved RVM support.
 * Performance optimizations.
 * Various bug fixes.


Release 4.0.0 release candidate 5
---------------------------------

 * The default config snippet for Apache has changed! It must now contain a
   `PassengerDefaultRuby` option. The installer has been updated to output
   this option. The `PassengerRuby` option still exists, but it's only used
   for configuring different Ruby interpreters in different contexts. Please
   refer to the manual for more information.
 * We now provide GPG digital signatures for all file releases by Phusion.
   More information can be found in the manual.
 * `passenger-status` now displays process memory usage and time when it
   was last used. The latter fixes issue #853.
 * Exceptions in Rack application objects are now caught to prevent
   application processes from exiting.
 * The `passenger-config` tool now supports the `--ruby-command` argument,
   which helps the user with figuring out the correct Ruby command to use
   in case s/he wants to use multiple Ruby interpreters. The manual has
   also been updated to mention this tool.
 * Fixed streaming responses on Apache.
 * Worked around an OS X Unix domain socket bug. Fixes issue #854.
 * Out-of-Band Garbage Collection now works properly when the application
   has disabled garbage collection. Fixes issue #859.
 * Fixed support for /usr/bin/python on OS X. Fixes issue #855.
 * Fixed looping-without-sleeping in the ApplicationPool garbage collector
   if PassengerPoolIdleTime is set to 0. Fixes issue #858.
 * Fixed some process memory usage measurement bugs.
 * Fixed process memory usage measurement on NetBSD. Fixes issue #736.
 * Fixed a file descriptor leak in the Out-of-Band Work feature. Fixes issue #864.
 * The PassengerPreStart helper script now uses the default Ruby
   interpreter specified in the web server configuration, and no longer
   requires a `ruby` command to be in `$PATH`.
 * Updated preferred PCRE version to 8.32.
 * Worked around some RVM bugs.
 * The ngx_http_stub_status_module is now enabled by default.
 * Performance optimizations.


Release 4.0.0 release candidate 4
---------------------------------

 * Fixed compilation on systems where /tmp is mounted noexec.
 * Fixed some memory corruption bugs.
 * Improved debugging messages.
 * Phusion Passenger Standalone now sets underscores_in_headers.
   Fixes issue #708.
 * Fixed some process spawning compatibility problems, as
   reported in issue #842.
 * The Python WSGI loader now correctly shuts down client sockets
   even when there are child processes that keep the socket open.
 * A new configuration option PassengerPython (Apache) and
   passenger_python (Nginx) has been added so that users can
   customize the Python interpreter on a per-application basis.
   Fixes issue #852.
 * The Apache module now supports file uploads larger than 2 GB
   when on 32-bit systems. Fixes issue #838.
 * The Nginx version now supports the `passenger_temp_dir` option.
 * Environment variables set in the Nginx configuration file
   (through the `env` config option) are now correctly passed to
   all application processes. Fixes issue #371.
 * Fixed support for RVM mixed mode installations. Fixes issue #828.
 * Phusion Passenger now outputs the Date HTTP header in case the
   application didn't already do that (and was violating the HTTP spec).
   Fixes issue #485.
 * Phusion Passenger now checks whether /dev/urandom isn't broken.
   Fixes issue #516.


Release 3.9.5 (4.0.0 release candidate 3)
-----------------------------------------

 * Fixed Rake autodetection.


Release 3.9.4 (4.0.0 release candidate 2)
-----------------------------------------

 * More bug fixes.
 * More documentation updates.
 * Better crash diagnostics.


Release 3.9.3 (4.0.0 release candidate 1)
-----------------------------------------

 * The Nginx version now supports the `passenger_app_root` configuration option.
 * The Enterprise memory limiting feature has been extended to work with non-Ruby applications as well.
 * Application processes that have been killed are now automatically detected within 5 seconds. Previously Phusion Passenger needed to send a request to the process before detecting that it's gone. This change means that when you kill a process by sending it a signal, Phusion Passenger will automatically respawn it within 5 seconds (provided that the process limit settings allow respawning).
 * Phusion Passenger Standalone's HTTP client body limit has been raised from 50 MB to 1 GB.
 * Python 3 support has been added.
 * The build system has been made compatible with JRuby and Ruby 2.0.
 * The installers now print a lot more information about detected system settings so that the user can see  whether something has been wrongly detected.
 * Some performance optimizations. These involve further extending the zero-copy architecture, and the use of hash table maps instead of binary tree maps.
 * Many potential crasher and freezer bugs have been fixed.
 * Error diagnostics have been further improved.
 * Many documentation improvements.


Release 3.9.2 (4.0.0 beta 2)
----------------------------

 * New feature: JRuby and Rubinius support.
 * New feature: Out of Band Work.
 * Sending SIGBART to a Ruby process will now trigger the same behavior
   as SIGQUIT - that is, it will print a backtrace. This is necessary
   for proper JRuby support because JRuby cannot catch SIGQUIT.
 * Rolling restarts and depoyment error resistance are now also available
   in Phusion Passenger Standalone in the Enterprise version.
 * System call failure simulation framework.
 * Improved crash reporting.
 * Many documentation improvements.
 * Many bug fixes.


Release 3.9.1 (4.0.0 beta 1)
----------------------------

This is the first beta of Phusion Passenger 4. The changes are numerous.

 * Support for multiple Ruby versions.
 * The internals now use evented I/O.
 * Real-time response buffering.
 * Improved zero-copy architecture.
 * Rewritten ApplicationPool and process spawning subsystem.
 * Multithreading within Ruby apps (Phusion Passenger Enterprise only).
 * Python WSGI support lifted to "beta" status.
 * More protection against stuck processes.
 * Automatically picks up environment variables from your bashrc.
 * Allows setting environment variables directly in Apache.
 * Automatic asset pipeline support in Standalone.
 * Deleting restart.txt no longer triggers a restart.
 * More stable Union Station support.
 * Many internal robustness improvements.
 * Better relocatability without wasting space.


Release 3.0.21
--------------

 * Rebootstrapped the libev configure to fix compilation problems on Solaris 11.
 * Fixed support for RVM mixed mode installations. Fixes issue #828.
 * Fixed encoding problems in Phusion Passenger Standalone.
 * Changed preferred Nginx version to 1.2.9.
 * Catch exceptions raised by Rack application objects.
 * Fix for CVE-2013-2119. Details can be found in the announcement for version 4.0.5.
 * Version 3.0.20 was pulled because its fixes were incomplete.


Release 3.0.19
--------------

 * Nginx security fix: do not display Nginx version when
   server_tokens are off.
 * Fixed compilation problems on some systems.
 * Fixed some Union Station-related bugs.


Release 3.0.18
--------------

 * Fixed compilation problems on Fedora 17.
 * Fixed Union Station compatibility with Rails 3.2.
 * Phusion Passenger Enterprise Standalone now supports rolling
   restarts and deployment error resistance.


Release 3.0.17
--------------

 * Fixed a Ruby 1.9 encoding-related bug in the memory measurer.
   (Phusion Passenger Enterprise)
 * Fixed OOM adjustment bugs on Linux.
 * Fixed compilation problems on Fedora 18 and 19.
 * Fixed compilation problems on SunOS.
 * Fixed compilation problems on AIX. Contribution by Perry Smith.
 * Fixed various compilation warnings.
 * Upgraded preferred Nginx version to 1.2.3.

3.0.16 was an unofficial hotfix release, and so its announcement had been skipped.


Release 3.0.15
--------------

 * Updated documentation.
 * Updated website links.


Release 3.0.14
--------------

 * [Apache] Fixed a long-standing mod_rewrite-related problem.
   Some mod_rewrite rules would not work, but it depends on the exact
   mod_rewrite configuration so it would work for some people but not
   for others. Issue #563. Thanks a lot to cedricmaion for providing
   information on the nature of the bug and to peter.nash55 for
   providing a VM that allowed us to reproduce the problem.
 * [Nginx] Preferred Nginx version to 1.2.2.
   The previously preferred version was 1.2.1.
 * Cleared some confusing terminology in the documentation.
 * Fixed some Ruby 1.9 encoding problems.


Release 3.0.13
--------------

 * [Nginx] Preferred Nginx version upgraded to 1.2.1.
 * Fixed compilation problems on FreeBSD 6.4. Fixes issue #766.
 * Fixed compilation problems on GCC >= 4.6.
 * Fixed compilation problems on OpenIndiana and Solaris 11. Fixes issue #742.
 * Union Station-related bug fixes.
 * Sending the soft termination signal twice to application processes no longer makes them crash. Patch contributed by Ian Ehlert.


Release 3.0.12
--------------

 * [Apache] Support Apache 2.4. The event MPM is now also supported.
 * [Nginx] Preferred Nginx version upgraded to 1.0.15.
 * [Nginx] Preferred PCRE version upgraded to 8.30.
 * [Nginx] Fixed compatibility with Nginx < 1.0.10.
 * [Nginx] Nginx is now installed with http_gzip_static_module by default.
 * [Nginx] Fixed a memory disclosure security problem.
   The issue is documented at http://www.nginx.org/en/security_advisories.html
   and affects more modules than just Phusion Passenger. Users are advised
   to upgrade as soon as possible. Patch submitted by Gregory Potamianos.
 * [Nginx] passenger_show_version_in_header now hides the Phusion Passenger version number from the 'Server:' header too.
   Patch submitted by Gregory Potamianos.
 * Fixed a /proc deprecation warning on Linux kernel >= 3.0.


Release 3.0.11
--------------

 * Fixed a compilation problem on platforms without alloca.h, such as FreeBSD 7.
 * Improved performance and solved some warnings on Xen systems by compiling
   with `-mno-tls-direct-seg-refs`. Patch contributed by Michał Pokrywka.


Release 3.0.10
--------------

 * [Nginx] Dropped support for Nginx versions older than 1.0.0
 * [Nginx] Fixed support for Nginx 1.1.4+
 * [Nginx, Standalone] Upgraded default Nginx version to 1.0.10
   The previously default version was 1.0.5.
 * [Nginx] New option passenger_max_requests
   This is equivalent to the PassengerMaxRequests option in the Apache
   version: Phusion Passenger will automatically shutdown a worker process
   once it has processed the specified number of requests.
   Contributed by Paul Kmiec.
 * [Apache] New option PassengerBufferResponse
   The Apache version did not buffer responses. This could block the Ruby
   worker process in case of slow clients. We now enable response buffering
   by default. It can be turned off through this option. Feature contributed
   by Ryo Onodera.
 * Fixed remaining Ruby 1.9.3 compatibility problems
   We already supported Ruby 1.9.3 since 3.0.8, but due to bugs in Ruby
   1.9.3's build system Phusion Passenger would fail to detect Ruby 1.9.3
   features on some systems. Fixes issue #714.
 * Fixed a bug in PassengerPreStart
   A regression was introduced in 3.0.8, causing the prespawn script to
   connect to the host name instead of to 127.0.0.1. Fix contributed by
   Andy Allan.
 * Fixed compatibility with GCC 4.6
   Affected systems include Ubuntu 11.10.
 * Fixed various compilation problems.
 * Fixed some Ruby 1.9 encoding problems.
 * Fixed some Ruby 1.9.3 deprecation warnings.


Release 3.0.9
-------------

 * [Nginx] Fixed a NULL pointer crash that occurs on HTTP/1.0 requests
   when the Host header isn't given.
 * Fixed deprecation warnings on RubyGems >= 1.6.
 * Improved Union Station support stability.


Release 3.0.8
-------------

 * [Nginx] Upgraded preferred Nginx version to 1.0.5.
 * [Nginx] Fixed various compilation problems on various platforms.
 * [Nginx] We now ensure that SERVER_NAME is equal to HTTP_HOST without the port part.
   This is needed for Rack compliance. By default Nginx sets SERVER_NAME to
   whatever is specified in the server_name directive, but that's not necessarily
   the correct value. This fixes, for example, the use of the 'map' statement
   in config.ru.
 * [Nginx] Added the options passenger_buffer_size, passenger_buffers and passenger_busy_buffers_size.
   These options are similar to proxy_module's similarly named options. You can
   use these to e.g. increase the maximum header size limit.
 * [Nginx] passenger_pre_start now supports virtual hosts that listen on Unix domain sockets.
 * [Apache] Fixed the pcre.h compilation problem.
 * [Standalone] Fixed 'passenger stop'.
   It didn't work properly because it kept waiting for 'tail' to exit.
   We now properly terminate 'tail' as well.
 * Fixed compatibility with Rake 0.9.
 * Fixed various Ruby 1.9 compatibility issues.
 * Various documentation improvements.
 * New Union Station filter language features.
   It now supports status codes and response times.
   Please refer to https://engage.unionstationapp.com/help#filtering
   for more information.


Release 3.0.7
-------------

 * Fixed a bug passenger-install-apache2-module. It could crash on
   some systems due to a typo in the code.
 * Upgraded preferred Nginx version to 1.0.0.
 * Phusion Passenger Standalone now pre-starts application processes
   at startup instead of doing that at the first request.
 * When sending data to Union Station, the HTTP status code is now also
   logged.
 * Various Union Station-related stability improvements.
 * The Linux OOM killer was previously erroneously disabled for all
   Phusion Passenger processes, including application processes. The
   intention was to only disable it for the Watchdog. This has been
   fixed, and the Watchdog is now the only process for which the OOM
   killer is disabled.
 * Fixed some compilation problems on OpenBSD.
 * Due to a typo, the dependency on file-tail was not entirely removed
   in 3.0.6. This has now been fixed.


Release 3.0.6
-------------

 * Fixed various compilation problems such as XCode 4 support and OpenBSD support.
 * Fixed various Union Station-related stability issues.
 * Fixed an issue with host name detection on certain platforms.
 * Improved error logging in various parts.
 * The dependency on the file-tail library has been removed.
 * During installation, check whether /tmp is mounted with 'noexec'.
   Phusion Passenger's installer relies on /tmp *not* being mounted
   with 'noexec'. If it is then the installer will now show a helpful
   error message instead of bailing out in a confusing manner. Users
   can now tell the installer to use a different directory for storing
   temporary files by customizing the $TMPDIR environment variable.
 * Phusion Passenger Standalone can now run Rackup files that are not named 'config.ru'.
   The filename can be passed through the command line using the -R option.


Release 3.0.5
-------------

 * [Apache] Fixed Union Station process statistics collection
   Union Station users that are using Apache may notice that no process
   information show up in Union Station. This is because of a bug in
   Phusion Passenger's Apache version, which has now been fixed.
 * [Apache] PassengerAnalytics has been renamed to UnionStationSupport
   This option has been renamed for consistency reasons.
 * [Nginx] passenger_analytics has been renamed to union_station_support
   This option has been renamed for consistency reasons.
 * Fixed Union Station data sending on older libcurl versions
   Some Union Station users have reported that their data don't show up.
   Upon investigation this turned out to be a compatibility with older
   libcurl versions. Affected systems include all RHEL 5 based systems,
   such as RHEL 5.5 and CentOS 5.5. We've now fixed compatibility
   with older libcurl versions.
 * Added support for the Union Station filter language
   This language can be used to limit the kind of data that's sent to
   Union Station. Please read
   https://engage.unionstationapp.com/help#filtering for details.
 * Fixed a PassengerMaxPoolSize/passenger_max_pool_size violation bug
   People who host a lot of different applications on Phusion Passenger
   may notice that it sometimes spawns more processes than is allowed
   by PassengerMaxPoolSize/passenger_max_pool_size. This has been fixed.


Release 3.0.4
-------------

 * [Apache] Changed mod_dir workaround hook priority
   Phusion Passenger temporarily disables mod_dir on all Phusion
   Passenger-handled requests in order to avoid conflicts. In order to do this
   it registers some Apache hooks with the APR_HOOK_MIDDLE priority, but it
   turned out that this breaks some other modules like mod_python. The hook
   priority has been changed to APR_HOOK_LAST to match mod_dir's hook
   priorities. Issue reported by Jay Freeman.
 * Added support for Union Station: http://www.unionstationapp.com/
 * Some error messages have been improved.


Release 3.0.3
-------------

 * [Nginx] Preferred Nginx version upgraded to 0.8.54
   The previous preferred version was 0.8.53.
 * PATH_INFO and REQUEST_URI now contain the original escaped URI
   Phusion Passenger passes the URI, as reported by Apache/Nginx, to
   application processes through the PATH_INFO and REQUEST_URI variables.
   These variables are supposed to contain the original, unescaped URI, e.g.
   /clubs/%C3%BC. Both Apache and Nginx thought that it would be a good idea
   to unescape the URI before passing it to modules like Phusion Passenger,
   thereby causing PATH_INFO and REQUEST_URI to contain the unescaped URI,
   e.g. /clubs/ü. This causes all sorts of encoding problems. We now manually
   re-escape the URI when setting PATH_INFO and REQUEST_URI. Issue #404.
 * The installer no longer detects directories as potential commands
   Previously the installer would look in $PATH for everything that's
   executable, including directories. If one has /usr/lib in $PATH
   and a directory /usr/lib/gcc exists then the installer would recognize
   /usr/lib/gcc as the compiler. We now explicitly check whether the item
   is also a file.
 * PseudoIO now responds to #to_io
   Phusion Passenger sets STDERR to a PseudoIO object in order to capture
   anything written to STDERR during application startup. This breaks
   some libraries which expect STDERR to respond to #to_io. This has now
   been fixed. Issue #607.
 * Fixed various other minor bugs
   See the git commit log for details.


Release 3.0.2
-------------

 * [Nginx] Fixed compilation problems
   The Nginx compilation process was broken due to not correctly reverting
   the working directory of the Nginx configure script. This has been fixed:
   issue #595.
 * [Nginx] Fixed crash if passenger_root refers to a nonexistant directory
   Issue #599.
 * Fixed compilation problems on NetBSD
   There was a typo in a NetBSD-specific fcntl() call. It also turns out that
   NetBSD doesn't support some ISO C99 math functions like llroundl(); this
   has been worked around by using other functions. Issue #593.
 * Fixed file descriptor closing issues on FreeBSD
   Phusion Passenger child processes didn't correct close file descriptors
   on FreeBSD because it queries /dev/fd to do that. On FreeBSD /dev/fd
   only returns meaningful results if fdescfs is mounted, which it isn't
   by default. Issue #597.


Release 3.0.1
-------------

 * MUCH faster compilation
   We've applied code aggregation techniques, allowing Phusion Passenger
   to be compiled much quicker now. For example, compiling the Nginx
   component (not Nginx itself) on a MacBook Pro now takes only 29
   seconds instead of 51 seconds, an improvement of 75%! Compiling the
   Apache module on a slower Dell Inspiron now takes 39 seconds instead of
   1 minute 22 seconds, or 110% faster!
 * Fixed malfunction after web server restart
   On Linux systems that have a non-standard filesystem on /tmp, Phusion
   Passenger could malfunction after restarting the web server because of
   a bug that's only triggered on certain filesystems. Issue #569.
 * Boost upgraded to version 1.44.0.
   We were on 1.42.0.
 * Much improved startup error messages
   Phusion Passenger performs many extensive checks during startup to ensure
   integrity. However the error message in some situation could be vague.
   These startup error messages have now been improved dramatically, so that
   if something goes wrong during startup you will now more likely know why.
 * Curl < 7.12.1 is now supported
   The previous version fails to compile with Curl versions earlier than
   7.12.1. Issue #556.
 * passenger-make-enterprisey fixed
   This is the command that people can run after donating. It allows people
   to slightly modify Phusion Passenger's display name as a joke. In 3.0.0 it
   was broken because of a typo. This has been fixed.
 * Removed passenger-stress-test
   This tool was used during the early life of Phusion Passenger for stress
   testing websites. Its performance has never been very good and there are
   much better tools for stress testing, so this tool has now been removed.
 * [Apache] RailsEnv and RackEnv configuration options are now equivalent
   In previous versions, RailsEnv only had effect on Rails 1 and Rails 2 apps
   while RackEnv only had effect on Rack apps. Because Rails 3 apps are
   considered Rack apps, setting RailsEnv had no effect on Rails 3 apps.
   Because this is confusing to users, we've now made RailsEnv and RackEnv
   equivalent. Issue #579.
 * [Nginx] Fixed compilation problems on systems with unpowerful shells
   Most notably Solaris. Its default shell does not support some basic
   constructs that we used in the Nginx configure script.
 * [Nginx] Upgraded default Nginx version to to 0.8.53
   The previous default was 0.8.52.
 * [Nginx] passenger_enabled now only accepts 'on' or 'off' values
   Previously it would recognize any value not equal to 'on' as meaning
   'off'. This caused confusion among users who thought they could also
   specify 'true', so we now throw a proper error if the value is
   unrecognized. Fixes issue #583.


Release 3.0.0
-------------

This is a major release with many changes. Please read our blog for details.


Release 2.2.15
--------------

 * [Apache] Fixed incorrect temp dir cleanup by passenger-status
   On some systems, running passenger-status could print the following
   message:
   
      *** Cleaning stale folder /tmp/passenger.1234
   
   ...after which Phusion Passenger breaks because that directory is
   necessary for it to function properly. The cause of this problem
   has been found and has been fixed.
 * [Apache] Fixed some upload handling problems
   Previous versions of Phusion Passenger check whether the size of
   the received upload data matches the contents of the Content-Length
   header as received by the client. It turns out that there could
   be a mismatch e.g. because of mod_deflate input compression, so
   we can't trust Content-Length anyway and we're being too strict.
   The check has now been removed.
 * [Nginx] Fixed compilation issues with Nginx >= 0.7.66
   Thanks to Potamianos Gregory for reporting this issue. Issue #500.
 * [Nginx] Default Nginx version changed to 0.7.67
   The previous default version was 0.7.65.
 * Fixed more Bundler problems
   Previous versions of Phusion Passenger would preload some popular
   libraries such as mysql and sqlite3 in order to utilize copy-on-write
   optimizations better. However this behavior conflicts with Bundler
   so we've removed it.


Release 2.2.14
--------------

 * Added support for Rubinius
   Patch contributed by Evan Phoenix.
 * Fixed a mistake in the SIGQUIT backtrace message.
   Patch contributed by Christoffer Sawicki.
 * [Nginx] Fix a localtime() crash on FreeBSD
   This was caused by insufficient stack space for threads. Issue #499.


Release 2.2.13
--------------

 * Fixed some Rails 3 compatibility issues that were recently introduced.
 * Fixed a typo that causes config/setup_load_paths.rb not to be loaded
   correctly.


Release 2.2.12
--------------

 * Improved Bundler support.
   Previous versions might not be able to correctly load gems bundled
   by Bundler. We've also documented how our Bundler support works and
   how to override our support if you need special behavior.
   Please refer to the Phusion Passenger Users Guide, section
   "Bundler support".
 * Worked around some user account handling bugs in Ruby. Issue #192.
 * Fixed some Ruby 1.9 tempfile.rb compatibility problems.
 * Fixed some compilation problems on some ARM Linux platforms.
 * [Apache] Suppress bogus mod_xsendfile-related error messages.
   When mod_xsendfile is being used, Phusion Passenger might print
   bogus error messages like "EPIPE" or "Apache stopped forwarding
   the backend's response" to the log file. These messages are
   normal, are harmless and can be safely ignored, but they pollute
   the log file. So in this release we've added code to suppress
   these messages when mod_xsendfile is being used. Issue #474.
 * [Nginx] Fixed "passenger_user_switching off" permission problems
   If Nginx is running as root and passenger_user_switching is turned
   off, then Phusion Passenger would fail to initialize because of
   a permission problem. This has been fixed. Issue #458.
 * [Nginx] Nginx >= 0.8.38 is now supported.
   Thanks to Sergey A. Osokin for reporting the problem.
 * [Nginx] passenger-install-nginx-module upgraded
    It now defaults to installing Nginx 0.7.65 instead of 0.7.64.


Release 2.2.11
--------------

 * This release fixes a regression that appeared in 2.2.10 which only
   affects Apache. When under high load, Apache might freeze and stop
   responding to requests. It is caused by a race condition which is
   why it escaped our last release testing.
   
   This problem does not affect Nginx; you only have to upgrade if
   you're using Apache.
   
   http://groups.google.com/group/phusion-passenger/t/d5bb2f17c8446ea0


Release 2.2.10
--------------

 * Fixed some Bundler compatibility problems.
 * Fixed some file descriptor passing problems, which previously
   could lead to mysterious crashes.
 * Fixed some compilation problems on newer GCC versions. Issue #430.
 * Support #size method in rack.input.



Release 2.2.9
-------------

 * Fixed compatibility with Rails 3.
   Actually, previous Phusion Passenger releases were already compatible
   with Rails 3, depending on the spawn method that would be invoked. Here's
   the story:
   
   Since Phusion Passenger 2.2.8, when the file config.ru exists, Phusion
   Passenger will treat the app as a Rack app, not as a Rails app. This is
   in contrast to earlier versions which gave Rails detection more priority
   than Rack detection. Phusion Passenger loads Rack apps and Rails apps in
   different ways. The Rails loader was not compatible with Rails 3, which
   is what we've fixed in this release.
   
   That said, a Rails 3 app would have worked out-of-the-box on Phusion
   Passenger 2.2.8 as well because Rails 3 apps include a config.ru file
   by default, causing Phusion Passenger 2.2.8 to use the Rack loader.
   Earlier versions of Phusion Passenger would just completely bail out
   because they'd use the Rails loader.
   
   That said, with 2.2.9 there are still some caveats:
   - Smart spawning (the mechanism with which REE's 33% memory reduction
     is implemented) is *not* supported for Rack apps. This means that if
     you want to utilize smart spawning with Rails 3, then you should
     remove your config.ru file.
   - Rails 3 depends on Rack 1.1.0. You must have Rack 1.1.0 installed as
     a gem, even if you've bundled it with the gem bundler. This is because
     Phusion Passenger itself depends on Rack.
   
   Both of these caveats are temporary. We have plans to solve both of these
   properly in the future.
 * What's up with the Gem Bundler?
   There has been some reports that Phusion Passenger is not compatible with
   Yehuda Katz's gem bundler (http://github.com/wycats/bundler). This might
   have been true for an earlier version of the gem bundler, but the latest
   version seems to work fine. Please note that you need to insert the
   following snippet in config/preinitializer.rb, as instructed by the gem
   bundler's README:
   
     require "#{RAILS_ROOT}/vendor/gems/environment"
   
   The Rails::Boot monkey patching code as posted at
   http://yehudakatz.com/2009/11/03/using-the-new-gem-bundler-today/
   does not seem to be required anymore.
 * Fixed support for ActiveRecord subclasses that connect to another database.
   ActiveRecord subclasses that connect to a database other than the default
   one did not have their connection correctly cleared after forking.
   This can result in weird errors along the lines of "Lost connection to
   MySQL server during query". Issue #429.
 * [Nginx] Fixed PCRE URL.
   passenger-install-nginx-module downloads PCRE 7.8 if PCRE is not already
   installed. However PCRE 7.8 has been removed from their FTP server,
   so we've updated the URL to point to the latest version, 8.0.


Release 2.2.8
-------------

 * [Nginx] Fixed some signal handling problems.
   Restarting Nginx on OS X with SIGHUP can sometimes take a long time or
   even fail completely. This is because of some signal handling problems,
   which have now been fixed.
 * [Nginx] Added OpenSSL as dependency.
   OpenSSL is required in order to install Nginx, but this was not checked
   by passenger-install-nginx-module. As a result,
   passenger-install-nginx-module fails on e.g. out-of-the-box Ubuntu
   installations until the user manually installs OpenSSL. Issue #422.
 * [Nginx] Fixed support for internal redirects and subrequests.
   It is now possible to, for example, point X-Accel-Redirects to Phusion
   Passenger-served URLs. Patch contributed by W. Andrew Loe III: issue #433.
 * [Apache] Fixed a GnuTLS compatibility issue.
   mod_gnutls can cause Phusion Passenger to crash because of an unchecked
   NULL pointer. This problem has now been fixed: issue #391.
 * Fixed thread creation issue on Intel Itanium platforms.
   This fixes issue #427.
 * Fixed compilation problems on Linux running on the Renesas SH4 CPU.
   Patch contributed by iwamatsu: issue #428.
 * The Rack library has been unvendored.
   The original reason for vendoring was to work around broken Rails
   applications that explicitly specify Rack as a gem dependency. We've
   found a better workaround that does not require vendoring Rack.
   This also fixes a compatibility problem with Rails 3, because Rails
   3 depends on a newer Rack version than the one we had vendored.
   Issue #432.
 * Fixed compatibility with Ruby 1.9.1 patchlevel >= 152
   Ruby 1.9.1 patchlevel >= 152 has a bug in its tempfile library. If you've
   seen an error message along the lines of

      *** Exception IOError in Passenger RequestHandler (closed stream)
   
   then this is a Ruby bug at work. This bug has been fixed in Ruby 1.9.2,
   but Ruby 1.9.1 still contains this bug. We've added a workaround so that
   the bug is not triggered with this Ruby version. Issue #432.


Release 2.2.7
-------------

 * Removed forgotten debugging code in passenger-install-apache2-module,
   which caused it not to compile anything.


Release 2.2.6
-------------

 * Some /tmp cleaner programs such as tmpwatch try to remove subdirectories
   in /tmp/passenger.xxx after a while because they think those
   subdirectories are unused. This could cause Phusion Passenger to
   malfunction, requiring a web server restart. Measures have now been
   taken to prevent those tmp cleaner programs from removing anything
   in /tmp/passenger.xxx. Issue #365.
 * When autodetecting the application type, Rack is now given more priority
   than Rails. This allows one to drop a config.ru file in a Rails directory
   and have it detected as a Rack application instead of a Rails application.
   Patch contributed by Sam Pohlenz: issue #338.
 * The default socket backlog has been increased from 'SOMAXCONN' (which
   is 128 on most platforms) to 1024. This should fix most
   'helper_server.sock failed: Resource temporarily unavailable'
   errors.
 * Fixed compilation problems on Solaris. Issue #369 and issue #379.
 * Fixed crashes on PowerPC.
 * Some Ruby 1.9 compatibility fixes. Issue #398.
 * The installer now displays correct dependency installation instructions
   for Mandriva Linux.
 * [Apache] The location of the 'apxs' and 'apr-config' commands can now
   also be passed to the installer through the --apxs-path and
   --apr-config-path parameters, in addition to the $APXS2 and $APR_CONFIG
   environment variables. Issue #3.
 * [Nginx] Various problems that only occur on 64-bit platforms have been fixed.
 * [Nginx] The installer now installs Nginx 0.7.64 by default.


Release 2.2.5
-------------

 * [Apache] Small file uploads are now buffered; fixes potential DoS attack
   Phusion Passenger buffers large file uploads to temp files so that it
   doesn't block applications while an upload is in progress, but it sent
   small uploads directly to the application without buffering it. This could
   result in a potential DoS attack: the client can send many small, incomplete
   file uploads to the server, and this would block all application processes
   until a timeout occurs. In order to solve this problem, Phusion Passenger
   now buffers small file uploads in memory. Bug #356.

 * [Apache] Fixed support for mod_rewrite passthrough rules
   Mod_rewrite passthrough rules were not properly supported because of a bug
   fix for supporting encoded slashes (%2f) in URLs. Unfortunately, due to
   bugs/limitations in Apache, we can support either encoded slashes or
   mod_rewrite passthrough rules, but not both; supporting one will break the
   other.

   Support for mod_rewrite passthrough rules is now enabled by default; that
   is, support for encoded slashes is disabled by default. A new configuration
   option, "PassengerAllowEncodedSlashes", has been added. Turning this option
   on will enable support for encoded slashes and disable support for
   mod_rewrite passthrough rules.

   Issue #113 and issue #230.

 * [Apache] Added a configuration option for resolving symlinks in the document root path
   Phusion Passenger 2.2.0 and higher no longer resolves symlinks in
   the document root path in order to properly support Capistrano-style
   directory structures. The exact behavior is documented in the Users Guide,
   section "How Phusion Passenger detects whether a virtual host is a web
   application".

   However, some people relied on the old behavior. A new configuration option,
   PassengerResolveSymlinksInDocumentRoot, has been added to allow reverting
   back to the old behavior.

   Patch contributed by Locaweb (http://www.locaweb.com.br/).

 * [Apache] mod_env variables are now also passed through CGI environment headers
   Prior to version 2.2.3, environment variables set by mod_env are passed to
   the application as CGI environment headers, not through Ruby's ENV variable.
   In the last release we introduced support for setting ENV environment
   variables with mod_env, and got rid of the code for setting CGI environment
   headers. It turns out that some people relied on the old behavior, we so now
   environment variables set with mod_env are set in both ENV and in the CGI
   environment.
   
   Fixes bug #335.

 * [Apache] Fixed compilation problems on some Linux systems with older versions of Apache
   If you used to see compilation errors like this:

       ext/apache2/Configuration.cpp:554: error: expected primary-expression before '.' token

   then this version should compile properly.

 * [Apache] Fixed I/O timeouts for communication with backend processes
   Got rid of the code for enforcing I/O timeouts when reading from or writing to
   a backend process. This caused more problems than it solved.

 * [Nginx] Support for streaming responses (e.g. Comet or HTTP push)
   Buffering of backend responses is now disabled. This fixes support for
   streaming responses, something which the Apache version has supported
   for a while now. One can generate streaming responses in Ruby on Rails
   like this:

       render :text => lambda { |response, output|
           10_000.times do |i|
               output.write("hello #{i}!\n")
           end
       }

 * [Nginx] Installer now installs Nginx 0.7.61 by default
   Previously it installed 0.6.37 by default.

 * [Nginx] Fixed the installer's --extra-configure-flags flag when combined with --auto-download
   Arguments passed to --extra-configure-flags were not being passed to the
   Nginx configure script when --auto-download is given. This has been
   fixed: bug #349.

 * [Nginx] Fixed unnecessary download of PCRE
   The installer now checks whether PCRE is installed in /opt/local (e.g.
   MacPorts) as well before concluding that it isn't installed and going ahead
   with downloading PCRE.

 * Fixed STDERR capturing
   While spawning an application, Phusion Passenger captures any output written
   to STDERR so that it can show them later if the application failed to start.
   This turns out to be much more difficult than expected, with all kinds of
   corner cases that can mess up this feature.

   For example, if the Rails log file is not writable, then this can cause
   Rails to crash with a bizarre and unhelpful error message whenever it tries
   to write to STDERR:

       /!\ FAILSAFE /!\  Thu Aug 20 14:58:39 +1000 2009
       Status: 500 Internal Server Error
       undefined method `[]' for nil:NilClass

   Some applications reopen STDERR to a log file. This didn't work.

   Of all of these problems have been fixed now. (Bug #332)

 * Fixed some bugs in application sources preloading
   Rails >= 2.2 already preloads the application sources, in which case Phusion
   Passenger wasn't supposed to perform it's own preloading, but the Rails
   >= 2.2 detection code was bugged. This has been fixed.

   Rails < 2.2 doesn't preload the application sources by itself, but there
   should be a certain order with which the sources are preloaded, otherwise
   preloading could fail in some applications. We now enforce a specific load
   order: first models, then controllers, then helpers.

   Bug #359.
 
 * Fixed a few bugs in WSGI compliance
   PATH_INFO is supposed to be set to the request URI, but without the query
   string and without the base URI. This has been fixed: bug #360.

 * Fixed some Ruby 1.9-specific crashes caused by encoding issues. Bug #354.
 * Fixed loading of config/environment.rb on Ruby 1.9.2, because Ruby 1.9.2
   no longer has "." in the default load path. Patch by metaljastix, issue #368.
 * The Users Guide for Apache now mentions something about correct permissions
   for application directories.
 * Fixed compilation problems on IA-64 (bug #118). We also reduced the stack
   sizes for the threads by half, so Phusion Passenger should use even less
   virtual memory now.
 * Fixed compilation problems on Linux systems with ARM CPU.
 * Fixed a few compatibility problems with 64-bit OpenBSD.
 * Fixed a few typos and minor bugs.


Older releases
--------------
Please consult the blog posts on http://blog.phusion.nl/ for the information about older releases.
