Basic http server in go using gorilla mux

main.go

package main

import (
	"flag"
	"fmt"
	"log"
	"net/http"
	"github.com/gorilla/mux"
)

var port= flag.Int("port", 8000, "Port to bind to")
var ip= flag.String("ip", "", "IP Address to bind to, blank for all")

func init() {
	flag.Parse()
}

func main() {
	router := mux.NewRouter()
	router.HandleFunc("/", helloWorldHandler).Methods(http.MethodGet)
	bindAddr := fmt.Sprintf("%s:%d", *ip, *port)
	fmt.Printf("Listening to %s\n", bindAddr)
	log.Fatal(http.ListenAndServe(bindAddr, router))
}

func helloWorldHandler(w http.ResponseWriter, r *http.Request) {
	w.WriteHeader(http.StatusOK)
	w.Header().Add("Content-Type", "text/plain")
	fmt.Fprintln(w, "Hello World")
}