You can overwrite the cookie, or delete it by setting it to nil. Session nil works for cookie sessions I believe.

Its been a while since I’ve touched that code. You could also set the expiration of the cookie to last the session.

@trevor you might also want to take a look at https://github.com/ring-clojure/ring-session-timeout/blob/master/src/ring/middleware/session_timeout.clj