Better martini error handler that supports 404 and 405 scenerios

main.go

package main

import (
	"github.com/talbright/martini"
	"net/http"
	"strings"
	"fmt"
)

func generic() string {
	return "Generic Handler"
}

func NotFound(res http.ResponseWriter,req *http.Request,routes martini.Routes) {
	availMethods := routes.MethodsFor(req.URL.Path)
	if len(availMethods)>0 {
		res.Header().Set("Allow", strings.Join(availMethods,","))
		http.Error(res, "405 method not allowed", http.StatusMethodNotAllowed)
	}else{
		http.Error(res, "404 page not found", http.StatusNotFound)
	}
}

func main() {
	m := martini.Classic()
	// curl -i -XPUT http://localhost:3000
	// curl -i -XGET http://localhost:3000
	m.Get("/", generic)
	m.NotFound(NotFound)
	m.Group("/worlds", func(r martini.Router) {
		// curl -i -XPUT http://localhost:3000/worlds/new
		// curl -i -XGET http://localhost:3000/worlds/new
		r.Post("/new", generic)
		r.Put("/new", generic)
		r.Delete("/new", generic)
	})
	m.Run()
}