gistfile1.rb

require 'sinatra/base'
require 'eventmachine'
require 'em-http-request'

EM.run do
  class App < Sinatra::Base
    get "/bar" do
      stream(:keep_open)  do |out|
        http = EventMachine::HttpRequest.new('https://www.google.dk/').get

        http.errback { out << "error!" }

        http.callback {
          p http.response_header.status
          p http.response_header
          p http.response
          out << http.response
        }

      end
    end
  end
  App.run!
end