code: func (s *RequestHeaderAuthenticationOptions) ToAuthenticationRequestHeaderConfig() *authenticatorfactory.RequestHeaderConfig {
  	if len(s.ClientCAFile) == 0 {
  		return nil
  	}
  
  	return &authenticatorfactory.RequestHeaderConfig{
  		UsernameHeaders:     s.UsernameHeaders,
  		GroupHeaders:        s.GroupHeaders,
  		ExtraHeaderPrefixes: s.ExtraHeaderPrefixes,
  		ClientCA:            s.ClientCAFile,
  		AllowedClientNames:  s.AllowedNames,
  	}
  }
docs: // ToAuthenticationRequestHeaderConfig returns a RequestHeaderConfig config object for these options
  // if necessary, nil otherwise.