code: func (s *HTTPServer) CoordinateNodes(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
  	if s.checkCoordinateDisabled(resp, req) {
  		return nil, nil
  	}
  
  	args := structs.DCSpecificRequest{}
  	if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
  		return nil, nil
  	}
  
  	var out structs.IndexedCoordinates
  	defer setMeta(resp, &out.QueryMeta)
  	if err := s.agent.RPC("Coordinate.ListNodes", &args, &out); err != nil {
  		sort.Sort(&sorter{out.Coordinates})
  		return nil, err
  	}
  
  	return filterCoordinates(req, out.Coordinates), nil
  }
docs: // CoordinateNodes returns the LAN nodes in the given datacenter, along with
  // raw network coordinates.