Rainbows! 4.6.1

A HTTP server for sleepy Rack applications

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What's new in Rainbows! 4.5.0:

  • This release adds hijacking support for Rack 1.5.x users. See Rack documentation for more information about hijacking. Lin Jen-Shin also provided the -N/--no-default-middleware option. Minor packaging cleanups and new HACKING document.
  • There are also some corner-case bugfixes for *Epoll* users (sleepy_penguin, these bugs do not affect EM or Cool.io users) and test suite portability improvements.
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GPL v3 
The Rainbows! Team
ROOT \ Internet \ HTTP (WWW)
1 Rainbows! Screenshot:
Rainbows! is a HTTP server for sleepy Rack applications. It is based on Unicorn, but designed to handle applications that expect long request/response times and/or slow clients. For Rack applications not heavily bound by slow external network dependencies, consider Unicorn instead as it simpler and easier to debug.

Rainbows! is for the odd things Unicorn fails at:

* 3rd-party APIs (to services outside your control/LAN)
* OpenID consumers (to providers outside your control/LAN)
* Reverse proxy implementations with editing/censoring (to upstreams outside your control/LAN)
* Comet
* BOSH (with slow clients)
* HTTP server push
* Long polling
* Reverse Ajax

Rainbows may also be used to service slow clients even with fast applications using the Rev concurrency model.


You may download the tarball from the Rainbows project page on Rubyforge and run setup.rb after unpacking it:


You may also install it via Rubygems on Rubyforge:

 gem install rainbows


for Rack applications

In APP_ROOT (where config.ru is located), run:


Rainbows! will bind to all interfaces on TCP port 8080 by default.

Configuration File(s)

Rainbows! will look for the config.ru file used by rackup in APP_ROOT.

For deployments, it can use a config file for Unicorn and Rainbows!-specific options specified by the --config-file/-c command-line switch. Rainbows! accepts all options found in Unicorn::Configurator as well as the “Rainbows!” block, so you can have the following in your config file:

 Rainbows! do
 use :Revactor
 worker_connections 400

Last updated on February 28th, 2013

feature list requirements

#HTTP server #Rack applications #web server #Rack #HTTP #server #Unicorn

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