I've fixed OpenId plugin, and it required using some server-side storage for really short amount of time - just between 2 pages. What would be best solution for this?
Gdn::Cache() seems to be not working, Gdn::Session->SetAttribute() works only at runtime, Gdn::Session->SetPreference() works for registered users only (while this is at registration process).
$_SESSION is not being used in vanilla at all. Is it ok to start php session and use it?