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A very fast & simple Ruby web server

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Octocat-spinner-32 benchmark
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== Thin
Tiny, fast & funny HTTP server

Thin is a Ruby web server that glues together 3 of the best Ruby libraries in web history:
 * the Mongrel parser: the root of Mongrel speed and security
 * Event Machine: a network I/O library with extremely high scalability, performance and stability
 * Rack: a minimal interface between webservers and Ruby frameworks
Which makes it, with all humility, the most secure, stable, fast and extensible Ruby web server
bundled in an easy to use gem for your own pleasure.

=== Installation
For the latest stable version:

 sudo gem install thin

or using my mirror (might be more recent and unstable):

 sudo gem install thin --source

Or from source:

 git clone git://
 cd thin
 rake install

=== Usage
A +thin+ script is offered to easily start your Rails application:

 cd to/your/rails/app
 thin start

But Thin is also usable through Rack +rackup+ command.
You need to setup a file and require thin in it:
 cat <<EOS
 require 'thin'
 app = proc do |env|
      'Content-Type' => 'text/html',
      'Content-Length' => '2'
 run app
 rackup -s thin
See example/ for details and rackup -h

=== License
Ruby License,

=== Credits
The parser was stolen from Mongrel by Zed Shaw.
Mongrel Web Server (Mongrel) is copyrighted free software by Zed A. Shaw
<zedshaw at zedshaw dot com> You can redistribute it and/or modify it under
either the terms of the GPL.

Thin is copyright Marc-Andre Cournoyer <>

Get help at
Report bugs at
and major security issues directly to a team member (see COMMITTERS)
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