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Phusion Passenger 4.0.52 released

By Hongli Lai on September 24th, 2014

Phusion Passenger is a fast and robust web server and application server for Ruby, Python, Node.js and Meteor. Passenger takes a lot of complexity out of deploying web apps, and adds powerful enterprise-grade features that are useful in production. High-profile companies such as Apple, New York Times, AirBnB, Juniper, American Express, etc are already using it, as well as over 350.000 websites.

Phusion Passenger is under constant maintenance and development. Version 4.0.52 is a bugfix release.

Phusion Passenger also has an Enterprise version which comes with a wide array of additional features. By buying Phusion Passenger Enterprise you will directly sponsor the development of the open source version.

Recent changes

Version 4.0.50 and 4.0.51 have been skipped because they were hotfixes for Enterprise customers. The changes in 4.0.50, 4.0.51 and 4.0.52 combined are as follows:

  • Fixed a null termination bug when autodetecting application types.
  • Node.js apps can now also trigger the inverse port binding mechanism by passing '/passenger' as argument. This was introduced in order to be able to support the Hapi.js framework. Please read this StackOverflow answer for more information regarding Hapi.js support.
  • It is now possible to abort Node.js WebSocket connections upon application restart. Please refer to this page for more information. Closes GH-1200.
  • Passenger Standalone no longer automatically resolves symlinks in its paths.
  • passenger-config system-metrics no longer crashes when the system clock is set to a time in the past. Closes GH-1276.
  • passenger-status, passenger-memory-stats, passenger-install-apache2-module and passenger-install-nginx-module no longer output ANSI color codes by default when STDOUT is not a TTY. Closes GH-487.
  • passenger-install-nginx-module --auto is now all that’s necessary to make it fully non-interactive. It is no longer necessary to provide all the answers through command line parameters. Closes GH-852.
  • Minor contribution by Alessandro Lenzen.
  • Fixed a potential heap corruption bug.
  • Added Union Station support for Rails 4.1.

Installing or upgrading to 4.0.52

OS X OS X Debian Debian Ubuntu Ubuntu
Heroku Heroku Ruby gem Ruby gem Tarball Tarball


Phusion Passenger’s core is open source. Please fork or watch us on Github. 🙂

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