async_sinatra_streaming_example.rb

require 'sinatra'
require 'eventmachine'

get '/' do
  stream(:keep_open) do |out|
    count = 0
    timer = EM.add_periodic_timer(1) do
      out << "<p>ohai</p>\n"
      count += 1
      if count == 10
        timer.cancel 
        out.close
      end
    end
  end
end