func (p ParameterProvider) PathParams(req *http.Request) map[string]string { return mux.Vars(req) }
func (p ParameterProvider) PathParam(req *http.Request, param string) string { return mux.Vars(req)[param] }
func (r RouteProvider) Vars(req *http.Request) map[string]string { return mux.Vars(req) }