Build Status Gem Version Gem

A High Performance HTTP Server for Ruby


require 'agoo'

Agoo::Server.init(6464, 'root')

class MyHandler
  def call(req)
    [ 200, { }, [ "hello world" ] ]

handler =
Agoo::Server.handle(:GET, "/hello", handler)

# To run this example type the following then go to a browser and enter a URL
# of localhost:6464/hello.
# ruby hello.rb


gem install agoo

What Is This?

Agoo is Japanese for a type of flying fish. This gem flies. It is a high performance HTTP server that serves static resource at hundreds of thousands of fetchs per second. A a simple hello world Ruby handler at over 100,000 requests per second on a desktop computer. That places Agoo at about 85 times faster than Sinatra and 1000 times faster than Rails. In both cases the latency was two orders of magnitude lower or more. Checkout the benchmarks. Note that the benchmarks had to use a C program called Perfer to hit the Agoo limits. Ruby benchmarks driver could not push Agoo hard enough.

Agoo supports the Ruby rack API which allows for the use of rack compatible gems such as Hanami and Rails. Agoo also supports WebSockets and SSE.


  • Clustered Agoo is ready. For slower application and a machine with multiple cores a significant improvement is performance is realized. The application must be stateless in that no data is shared between workers.

  • WebSocket and SSE are supported and a PR has been submitted to updated the Rack spec. Go over to the proposed Rack extension and give it a look and a thumbs-up or heart if you like it.

  • Agoo now serves Rails static assets more than 8000 times faster than the default Puma. Thats right, 8000 times faster.



Releases are made from the master branch. The default branch for checkout is the develop branch. Pull requests should be made against the develop branch.


Follow @peterohler on Twitter for announcements and news about the Agoo gem.