basic

basic.go

package main

import (
	"fmt"
	"net/http"
	"os"
)

func rootHandler(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte("hello world"))
}

func main() {
	port := os.Getenv("PORT")
	if port == "" {
		port = "8888"
	}
	fmt.Println("listening on", port)
	http.ListenAndServe("0.0.0.0:"+port, http.HandlerFunc(rootHandler))
}