es-proxy.rb

#!/usr/bin/env ruby

require 'em-proxy'

Proxy.start(:host => "0.0.0.0", :port => 9201, :debug => false) do |conn|
  conn.server :srv, :host => "127.0.0.1", :port => 9200

  conn.on_data do |data|
    puts data
    data
  end

  conn.on_response do |backend, resp|
    puts resp
    resp
  end

  conn.on_finish do |backend, name|
    puts name
    unbind if backend == :srv
  end
end