Golang : Multiplexer with net/http and map

This is additional tutorial on multiplexer, with just net/http package and a map.

A multiplexer allows you to route to different function or handler based on the URL's path.

For example :

 "/someresource/:id" ---> "code to do something with the resource"

 "/users/:name/profile" ---> "code to do something with the profile"

This tutorial is similar to the previous tutorial on multiplexer with NewServeMux() function, but it uses a map instead.

 package main

 import "net/http"

 type home struct{}

 func (h home) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 w.Write([]byte("Hello, World!"))
 }

 type page struct {
 body string
 }

 func (p page) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 // echo back the page first URI
 w.Write([]byte(p.body))
 }

 // use map instead
 type multiplexer map[string]http.Handler

 func (m multiplexer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 if handler, ok := m[r.RequestURI]; ok {
 handler.ServeHTTP(w, r)
 } else {
 w.WriteHeader(http.StatusNotFound)
 }
 }

 var mux = multiplexer{
 "/": home{},
 "/references/": page{"references"},
 "/tutorials/":  page{"tutorials"},
 }

 func main() {
 http.ListenAndServe(":8080", mux)
 }