Clojure wrap-json-response returning 404 - json

Question

I am learning to use Closure/Compojure and I am having problems on building a small web app.
I have the following routes defined on mywebapp/routes.clj
(defroutes app-routes
(GET "/" [] (index-page))
(GET "/about" [] (about-page))
(GET "/bluebutton" [] (bluebutton-page))
(GET "/bluebutton/patient" [] (patient-handler))
(route/resources "/")
(route/not-found "No page"))
And the one that is not working /bluebutton/patient, where I am expecting to have a JSON response with the following code:
(use '[ring.middleware.json :only [wrap-json-response]]
'[ring.util.response :only [response]])
(defn patient-handler []
(println "patient-handler")
(wrap-json-response (response {:body {:foo "bar"}})))
For some reason I am getting a 404 response on my browser but I am checking on REPL output that I am executing the code of patient-handler, do you guys know If I am missing something?
Thanks in advance! And sorry for my weird english!

Answer 1

wrap-json-response takes a function as it's argument and returns a new function that when called will to the json wrapping. like so:
(defn patient-handler []
(println "patient-handler")
(middleware/wrap-json-response (fn [_] (response {:body {:foo "bar"}}))))
though a more normal app would have this split into it's own function (or entire namespace):
(ns hello-web.handler
(:require [compojure.core :refer :all]
[compojure.handler :as handler]
[ring.middleware.json :as middleware]
[compojure.route :as route]
[ring.util.response :refer [response]]))
(defroutes app-routes
(GET "/" [] "Hello World")
(route/resources "/")
(GET "/bluebutton/patient" [] (patient-handler))
(route/not-found "Not Found"))
(def app
(handler/site app-routes))
(defn create-json-response [request]
(response {:body {:foo "bar"}}))
(defn patient-handler []
(println "patient-handler")
(middleware/wrap-json-response create-json-response))