I am returning an error from my route handler like this

return errors.New("Request interrupted by the client")

and I have registered a callback like this

app.OnError(func(ctx aero.Context, err error) {
		fmt.Printf("An Error occured.")
	         ctx.String(err.Error())
	})

but If I visit the route, The connection is closed without sending error message and no error message is printed in the console. It seems OnError callback is not working. Am I missing something?