docs: func Unmarshal(req *request.Request) {
  	defer req.HTTPResponse.Body.Close()
  	if req.DataFilled() {
  		err := jsonutil.UnmarshalJSON(req.Data, req.HTTPResponse.Body)
  		if err != nil {
  			req.Error = awserr.NewRequestFailure(
  				awserr.New("SerializationError", "failed decoding JSON RPC response", err),
  				req.HTTPResponse.StatusCode,
  				req.RequestID,
  			)
  		}
  	}
  	return
  }