Basic REST Api in Go w/ Gorilla

rest.go

package main

import (
	"net/http"
	"encoding/json"
	"github.com/gorilla/mux"
)

func HomeHandler(rw http.ResponseWriter, r *http.Request) {
	rw.Header().Set("Content-Type", "application/json")
	rw.Write([]byte("home"))
}

func CountryHandler(rw http.ResponseWriter, r *http.Request) {
	rw.Header().Set("Content-Type", "application/json")
	js, _ := json.Marshal([]string{"bolivia", "russia", "germany", "italy"})
	rw.Write(js)
}

func CityHandler(rw http.ResponseWriter, r *http.Request) {
	rw.Header().Set("Content-Type", "application/json")
	js, _ := json.Marshal([]string{"chicago", "moscow", "munich", "milan"})
	rw.Write(js)
}

func main() {
	r := mux.NewRouter()

	// Map url routes to functions
	r.HandleFunc("/", HomeHandler)
	r.HandleFunc("/countries", CountryHandler)
	r.HandleFunc("/cities", CityHandler)
	http.Handle("/", r)

	// Start server
	http.ListenAndServe(":3000", nil)
}