code: func (s *APIServer) deleteReverseTunnel(auth ClientI, w http.ResponseWriter, r *http.Request, p httprouter.Params, version string) (interface{}, error) {
  	domainName := p.ByName("domain")
  	err := auth.DeleteReverseTunnel(domainName)
  	if err != nil {
  		return nil, trace.Wrap(err)
  	}
  	return message(fmt.Sprintf("reverse tunnel %v deleted", domainName)), nil
  }
docs: // deleteReverseTunnel deletes reverse tunnel