main.go for the simple-server medium post

createSimpleServer.go

func main() {
	mux := http.NewServeMux()
	mux.Handle("/public/", logging(public()))
	mux.Handle("/", logging(index()))

	port, ok := os.LookupEnv("PORT")
	if !ok {
		port = "8080"
	}

	addr := fmt.Sprintf(":%s", port)
	server := http.Server{
		Addr:         addr,
		Handler:      mux,
		ReadTimeout:  15 * time.Second,
		WriteTimeout: 15 * time.Second,
		IdleTimeout:  15 * time.Second,
	}
	log.Println("main: running simple server on port", port)
	if err := server.ListenAndServe(); err != nil {
		log.Fatalf("main: couldn't start simple server: %v\n", err)
	}
}