Re-direction of URL in PM 5.8.2

Previously while using PMUser and PMHelpdesk in PM version 5.6.3 both URL behavior was observed as same - GET Response 200.

After Customer upgraded to PM version  5.8.2,  the PMHelpdesk behavior has different performance -  a redirection before getting the Response 200.

Customer is looking for any of the document that has mentioned that PMHelpdesk has added a redirection. Any idea ?