code: func addDefaultTimeout(tt fab.TimeoutType) RequestOption {
  	return func(ctx context.Client, o *requestOptions) error {
  		if o.Timeouts[tt] == 0 {
  			return WithTimeout(tt, ctx.EndpointConfig().Timeout(tt))(ctx, o)
  		}
  		return nil
  	}
  }
docs: // addDefaultTimeout adds default timeout if timeout is not specified