code: func init() {
  	render.Respond = func(w http.ResponseWriter, r *http.Request, v interface{}) {
  		if err, ok := v.(error); ok {
  
  			// We set a default error status response code if one hasn't been set.
  			if _, ok := r.Context().Value(render.StatusCtxKey).(int); !ok {
  				w.WriteHeader(400)
  			}
  
  			// We log the error
  			fmt.Printf("Logging err: %s\n", err.Error())
  
  			// We change the response to not reveal the actual error message,
  			// instead we can transform the message something more friendly or mapped
  			// to some code / language, etc.
  			render.DefaultResponder(w, r, render.M{"status": "error"})
  			return
  		}
  
  		render.DefaultResponder(w, r, v)
  	}
  }
docs: // This is entirely optional, but I wanted to demonstrate how you could easily
  // add your own logic to the render.Respond method.