handlers.go

package foo

import (
	"net/http"
)

type MethodHandler map[string]http.Handler

func (h MethodHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {	
	if handler, ok := h[req.Method]; ok {
		handler.ServeHTTP(w, req)
	} else {
		if len(h) > 0 {
			header := ""
			for k := range h {
				header += k + ", "
			}
			w.Header().Set("Allow", header[:len(header)-2])
		}
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)		
	}
}