code: func UrlFor(name string, args ...string) *url.URL {
  	r := Router.Get(name)
  	if r == nil {
  		log.Panicf("UrlFor: No such route '%s'\n", name)
  	}
  	u, err := r.URL(args...)
  	if err != nil {
  		log.Panicln("UrlFor: " + err.Error())
  	}
  	return u
  }
docs: // UrlFor returns the relative URL for the route name