Simplest simplest async rack server (for thin and friends)

async_rack.rb

class Server
    
  def call(env)
    
    EM.system 'sayBobInOneSecond' do |result, status|
      env['async.callback'].call [200, {'Content-Type' => 'text/plain'}, [result]]
    end

    throw :async
  end
  
end

run Server.new