gistfile1.rb

require 'rubygems'
require 'eventmachine'
require 'evma_httpserver'

module Simpleton
  include EventMachine::HttpServer

  def self.run
    EventMachine::run do
      EventMachine::start_server('0.0.0.0', 9000, self)
    end
  end
  
  def process_http_request
    response = EventMachine::DelegatedHttpResponse.new(self)
    response.status = 200
    response.headers['Content-Type'] = 'text/plain'
    response.content = "Hello\n"
    response.send_response
  end
end

Simpleton.run