I've been trying to get this xhrio co-effect to work. The core problem seems to be that db is not present. I can hard code the uri, and that works, but db isn't there. So I have two problems, the uri is incomplete and worse, it completely resets db to nothing but show-twirly.

(reg-event-fx                           ;; note the trailing -fx
 :http-inventory                        ;; usage:  (dispatch [:http-inventory])
 (fn [world [_ _]]                    ;; the first param will be "world"
   (let [db (:db world)
         server (str (:remote-server-path db) "api/products")]
     {:db   (assoc db :show-twirly true)   ;; causes the twirly-waiting-dialog to show??
      :http-xhrio {:method          :get
                   :uri             server
                   :timeout         8000                                           ;; optional see API docs
                   :response-format (ajax/json-response-format {:keywords? true})  ;; IMPORTANT!: You must provide this.
                   :on-success      [::success-http-result]
                   :on-failure      [::failure-http-result]}})))