code: func (c *RPCClientDriver) rpcStringCall(method string) (string, error) {
  	var info string
  
  	if err := c.Client.Call(method, struct{}{}, &info); err != nil {
  		return "", err
  	}
  
  	return info, nil
  }
docs: // Helper method to make requests which take no arguments and return simply a
  // string, e.g. "GetIP".