Same way ActionDispatch::Session::CacheStore does.
All session stores use a cookie to store a unique ID for each session...For most stores, this ID is used to look up the session data on the server, e.g. in a database table.
(obviously you'd substitute Redis for the database table mentioned above)
All session stores use a cookie to store a unique ID for each session...For most stores, this ID is used to look up the session data on the server, e.g. in a database table.
(obviously you'd substitute Redis for the database table mentioned above)