function drawEnd(evt) {
  let coords = evt.feature.getGeometry().getCoordinates();

  // how can i get these??
  let projection = null; // ????;
  let resolution = null; // ????;

  let getFeatureInfoUrl = self._myTileWMSLayer.getSource().getFeatureInfoUrl(evt.coordinates, resolution, projection);
  // call getFeatureInfoUrl....
}