I don’t do Web 2 but that URL will return a 404 unless you handle it in HandleURL and return True. Given it is HandleURL, it is (in and of itself) session agnostic.
This is the best thread with an example of session management from HandleURL provided by @Greg_O_Lone 
HandleURL Session Specific - Targets / Web - Xojo Programming Forum
In any case think you’ll need to return a ‘normal’ HTML page from this request if handling in HandleURL.