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.


For the latest stable version:

sudo gem install thin

or using my mirror (might be more recent):

sudo gem install thin --source

Or from source:

git clone git://
cd thin
rake install


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|
 [200, {'Content-Type'=>'text/html'}, ['hi']]

run app
rackup -s thin

See example/ for details and rackup -h


Ruby License,


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 <[email protected]>

Please report any bug at and major security issues directly to me at [email protected]