(ns sample.app (:require [ring.adapter.jetty :as jetty] [compojure.core :refer [defroutes GET]])) (defroutes handler (GET "/" [] {:headers {"Content-type" "text/plain; charset=UTF-8"} :body "Hello World!"})) (defn -main [] (jetty/run-jetty handler {:port (Integer. (or (System/getenv "PORT") "5000")) :join? false}))