Learning Clojure

learning-clojure.md

Ring

• Adapater Http Request -> Ring Request Ring Resposne -> Http Response
• Handler Ring Request -> Http Response Basically clojure function

(defn handler [req]
  {:status: 200
   :body "Hello, world!"
   :headers {}})

• Middleware Handler + Options -> Handler

(defn mw [hdlr & options]
  (fn [req]
    (hdlr (modify req)))
(defn mw [hdlr & options]
  (fn [req]
    (modify (hdlr req)))
(defn mw [hdlr & options]
  (fn [req]
    (do-something)
    (hdlr req))

Ring CheatSheet

Compojure

• Routing Path + Http Method route to specific Handler

(defroute rotues
  (Get "/" [] home-handler)
    ...
  (not-found "Page not found."))