gistfile1.txt

(defn add-trailing-slash
  [handler]
  (fn [request]
    (if (.endsWith (:uri request) "/")
      (handler request)
      (let [newurl (str/replace (:uri request) #"(?<=.)$" "/")]
        ({:status 301 :headers {"Location" newurl}})))))

(def app (-> app-routes
             handler/site
             add-trailing-slash
             wrap-stateful-session))