Allow call to external page on logout

[jeffchulg]

I installed a reverse proxy and I would like dokuwiki to auto-logoff and call this page.

There is currently no option to do it and this means that the auto-logoff is not actually working.

Would it be possible to add this capability ?

[jeffchulg]

Concretely, it means allow replacement for

send_redirect(wl($ID, '', true, '&'));

to
header('Location:XXX')

when some config is done.