code: func (s *HTTPServer) CoordinateNode(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
  	if s.checkCoordinateDisabled(resp, req) {
  		return nil, nil
  	}
  
  	node := strings.TrimPrefix(req.URL.Path, "/v1/coordinate/node/")
  	args := structs.NodeSpecificRequest{Node: node}
  	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.Node", &args, &out); err != nil {
  		return nil, err
  	}
  
  	result := filterCoordinates(req, out.Coordinates)
  	if len(result) == 0 {
  		resp.WriteHeader(http.StatusNotFound)
  		return nil, nil
  	}
  
  	return result, nil
  }
docs: // CoordinateNode returns the LAN node in the given datacenter, along with
  // raw network coordinates.