code: func (h *Handler) serveGetRaftLeader(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
  	leader := h.Store.Leader()
  	if leader == "" {
  		hh.ServiceUnavailableError(w, ErrNoKnownLeader.Error())
  		return
  	}
  
  	hh.JSON(w, 200, dt.RaftLeader{Host: h.Store.Leader()})
  }
docs: // serveGetRaftLeader returns the current raft leader.