Middleware

As far as route ordering, FYI:

(defmy-routes
(compojure.api.sweet/api:middleware [print-middleware-3 print-middleware-4]
(compojure.api.sweet/GET"/1/hello" request
:middleware [print-middleware-5 print-middleware-6]
(ring.util.response/response"Hello, World!"))))
(defmy-handler
(-> my-routes
print-middleware-2
print-middleware-1))
(let [request (mock/request:get"/1/hello")]
(my-handler request))
[1] Receiving Request [2] Receiving Request [3] Receiving Request
[4] Receiving Request
[5] Receiving Request
[6] Receiving Request
[6] Returning Response
[5] Returning Response
[4] Returning Response
[3] Returning Response
[2] Returning Response
[1] Returning Response
=> {:status200, :headers {}, :body"Hello, World!"}

Three places to apply middleware:

1. On a particular route (#5,6 in the above example). These get executed immediately after the handler + middleware injected by compojure.core.make-route;
2. On the whole app level (#3,4 in the above example). These get executed after the route handler + compojure.core middleware + route-level middleware;
3. On the whole app level (#1,2 in the above example). These get executed after the route handler + compojure.core middleware + route-level middleware + app-level middleware + the middleware injected by compojure.api.sweet/api.