I meant to reply to this, likelihood is they have removed the server side support for autofill requests. I won't bore you, or waste my owntime, writing out the details, if you really want to know PM me.
Basically, that link is correct and theoretically should work however the forum devs have either removed the functionality, if it used to work, through recent updates- or they never allowed it in the first place. There is no way around it I'm afraid.