code: func (c *Client) GetCACert() ([]byte, error) {
  	var cert bytes.Buffer
  	res, err := c.RawReq("GET", "/ca-cert", nil, nil, nil)
  	if err != nil {
  		return nil, err
  	}
  	defer res.Body.Close()
  	if _, err := io.Copy(&cert, res.Body); err != nil {
  		return nil, err
  	}
  	return cert.Bytes(), nil
  }
docs: // GetCACert returns the CA cert for the controller