code: func MakeStdHandler(fn StdHandlerFunc) http.HandlerFunc {
  	return func(w http.ResponseWriter, r *http.Request) {
  		// ensure that neither proxies nor browsers cache http traffic
  		SetNoCacheHeaders(w.Header())
  
  		out, err := fn(w, r)
  		if err != nil {
  			trace.WriteError(w, err)
  			return
  		}
  		if out != nil {
  			roundtrip.ReplyJSON(w, http.StatusOK, out)
  		}
  	}
  }
docs: // MakeStdHandler returns a new http.Handle func from http.HandlerFunc