code: public GpsTraceDetails get(long id)
  	{
  		SingleElementHandler<GpsTraceDetails> handler = new SingleElementHandler<>();
  		try
  		{
  			osm.makeAuthenticatedRequest(GPX + "/" + id, "GET", new GpsTracesParser(handler) );
  		}
  		catch(OsmNotFoundException e)
  		{
  			return null;
  		}
  		return handler.get();
  	}
docs: Get information about a given GPS trace or null if it does not exist.
  
  @throws OsmAuthorizationException if this application is not authorized to read the user's
  traces (Permission.READ_GPS_TRACES)
  OR if the trace in question is not the user's own trace
  and at the same time it is not public
  OR if not logged in at all