Why ServletHelper isn't included in flow 3?

Flow
1

I see ServletHelper in flow-server-2.2 but not in flow 3.
when I look in [api]
(https://vaadin.com/api/platform/14.1.23/com/vaadin/flow/server/ServletHelper.html) I see there but not inside flow-server-3.0.0

  1. Is it no more supported?
  2. what is alternative for it under flow 3?
2

ServletHelper has been replaced by HandlerHelper

See https://github.com/vaadin/flow/issues/5565 for details

HTH

Marco