yes WEB API (Ruby + Sinatra/Streaming)

yes_web_api.rb

# coding: utf-8
require 'sinatra'
require 'sinatra/streaming'

set server: 'thin', connections: []
th = Thread.new{
  while true
    puts "currently connection: #{settings.connections.size}"
    settings.connections.each{ |e|
      e << "yes\n"
    }
    sleep 1
  end
}

get '/' do
  stream :keep_open do |out|
    out.callback{ settings.connections.delete(out) }
    out.errback{ settings.connections.delete(out) }
    settings.connections << out
  end
end