i use the ring session middleware, it works just fine https://github.com/ring-clojure/ring/wiki/Sessions

that middleware is expecting a plain value response @UAEH11THP ( https://github.com/ring-clojure/ring/blob/master/ring-core/src/ring/middleware/session.clj#L108 ) - it won't work if your responses are Deferred - should be trivial to modify it to work with Deferred responses though

yeah things get tricky if you use deferred responses