public static void ConfigureExceptionHandler(this IApplicationBuilder app, ILoggerManager logger)
 {
     app.UseExceptionHandler(appError =>
     {
         appError.Run(async context =>
         {
             var contextFeature = context.Features.Get <IExceptionHandlerFeature>();
             if (contextFeature != null)
             {
                 await logger.LogExceptionAsync(contextFeature.Error);
             }
         });
     });
 }