code: func Params(r *http.Request) map[string]string {
  	v := r.Context().Value(routeParamsID)
  	if v == nil {
  		return map[string]string{}
  	}
  	if v, ok := v.(map[string]string); ok {
  		return v
  	}
  	return map[string]string{}
  }
docs: // Params return the router params