code: func (s *APIServer) getReverseTunnels(auth ClientI, w http.ResponseWriter, r *http.Request, p httprouter.Params, version string) (interface{}, error) {
  	reverseTunnels, err := auth.GetReverseTunnels()
  	if err != nil {
  		return nil, trace.Wrap(err)
  	}
  	items := make([]json.RawMessage, len(reverseTunnels))
  	for i, tunnel := range reverseTunnels {
  		data, err := services.GetReverseTunnelMarshaler().MarshalReverseTunnel(tunnel, services.WithVersion(version), services.PreserveResourceID())
  		if err != nil {
  			return nil, trace.Wrap(err)
  		}
  		items[i] = data
  	}
  	return items, nil
  }
docs: // getReverseTunnels returns a list of reverse tunnels