docs: function RAgent_onResponse(message) {
    var reqID = message.id
  
    if (!this._requestCBs.has(reqID)) return
  
    var cb = this._requestCBs.get(reqID)
    this._requestCBs.delete(reqID)
  
    if (message.error) {
      var err = new Error(message.error)
      return cb(err, message.body)
    }
  
    cb(null, message.body)
  }