Define the Routes with Reitit

Web Development with Clojure, Third Edition — by Dmitri Sotnikov, Scot Brown (17 / 107)

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Reitit is a general purpose routing library that can be used to provide routing on top of Ring as well as for client-side routing, as we’ll see later on. It provides a way to associate handler functions with a URL and an HTTP method.

We already saw some examples of routing using Reitit when we built our first application in Chapter 1, ​Getting Your Feet Wet​. Now let’s take a closer look at the functionality it provides. First, add it as a dependency in the ring-app project.

ring-app-5/project.clj

​ :dependencies [[org.clojure/clojure ​"1.10.1"​]
​                [metosin/muuntaja ​"0.6.7"​]
​                [metosin/reitit ​"0.5.11"​]
​                [metosin/ring-http-response ​"0.9.1"​]
​                [ring ​"1.8.2"​]]

With the dependency in place, let’s update the namespace to reference reitit.ring and add a route for the / URI.

ring-app-5/src/ring_app/core.clj

​ (​ns​ ring-app.core
​   (:require
​    [reitit.ring :as reitit]
​    [muuntaja.middleware :as muuntaja]
​    [ring.adapter.jetty :as jetty]
​    [ring.util.http-response :as response]
​    [ring.middleware.reload :refer [wrap-reload]]))
​ 
​ ​;;...​
​ 
​ (​def​ routes
​   [[​"/"​ {:get html-handler}]])
​ 
​ 
​ (​def​…