$:.unshift File.join(File.dirname(__FILE__), '..', 'lib/') require 'rack/server_status' use Rack::ServerStatus, scoreboard_path: './tmp' class HelloWorldApp def call(env) #sleep 10 [ 200, { 'Content-Type' => 'text/plain' }, ['Hello World!'] ] end end map "/foo" do run HelloWorldApp.new end