main.go

package main

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

var port = "8080"
var root = "."

func handler(h http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		log.Println(r.RemoteAddr, r.Method, r.URL)
		h.ServeHTTP(w, r)
	})
}

func main() {
	if env := os.Getenv("PORT"); env != "" {
		port = env
	}
	if args := os.Args; len(args) > 1 {
		root = args[1]
	}
	log.Println("Starting web server at http://0.0.0.0:" + port)
	panic(http.ListenAndServe(":"+port, handler(http.FileServer(http.Dir(root)))))
}