code: func MaxRecvMsgSize(s int) client.Option {
  	return func(o *client.Options) {
  		if o.Context == nil {
  			o.Context = context.Background()
  		}
  		o.Context = context.WithValue(o.Context, maxRecvMsgSizeKey{}, s)
  	}
  }
docs: //
  // MaxRecvMsgSize set the maximum size of message that client can receive.
  //