Version 4.1.0 of Unicorn

Release Notes: Rack::Chunked and Rack::ContentLength middlewares are loaded by default for RACK_ENV=(development|deployment) users. CTL characters are now rejected from HTTP header values and Exception messages are now filtered for [:cntrl:] characters. There were minor bugfixes and future-proofing changes for Ruby 2.0.

Other releases

  •  05 Feb 2014 21:05

Release Notes: This release fixes a race condition during worker startup.

  •  29 Jan 2014 14:20

Release Notes: This release fixes races/error handling in the worker SIGQUIT handler.

  •  11 Jan 2014 10:19

Release Notes: This release contains fairly major internal workings of master-to-worker notifications. There are also several bugfixes and documentation updates, but no incompatibilities.

  •  05 Nov 2013 02:27

Release Notes: This release supports SO_REUSEPORT on new listeners, and adds minor tweaks and fixes.

  •  21 Jun 2013 10:57

Release Notes: This release fixes the --no-default-middleware option. There are also minor documentation updates and internal cleanups.


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A MarkDown editor with live HTML previews.


Project Spotlight


A high performance document database.