code: func (c *Client) serverTrustedCerts(server string) []string {
  	configOnce.Do(c.parseConfig)
  	if config == nil {
  		return nil
  	}
  	alias := config.Alias(server)
  	if alias == "" {
  		return nil
  	}
  	return config.Servers[alias].TrustedCerts
  }
docs: // serverTrustedCerts returns the trusted certs for server from the config.