code: func (c *Client) GetClusterCACert() (*LocalCAResponse, error) {
  	out, err := c.Get(c.Endpoint("cacert"), url.Values{})
  	if err != nil {
  		return nil, trace.Wrap(err)
  	}
  	var localCA LocalCAResponse
  	if err := json.Unmarshal(out.Bytes(), &localCA); err != nil {
  		return nil, trace.Wrap(err)
  	}
  	return &localCA, nil
  }
docs: // GetClusterCACert returns the CAs for the local cluster without signing keys.