Web Development with Clojure, 2nd Edition

WebSockets Using Sente

Now that we have some familiarity with how WebSockets work, let’s take a look at using the Sente library,^[53] which provides a number of useful features, as seen in the following list.

• Ajax fallback support—Automatically falls back to using Ajax polling when WebSockets are not available

• keep-alives—Ensures the connection is not dropped

• buffering—Provides internal buffering for messages

• data encoding—Takes care of serializing and deserializing the message data

• Ring security—Is compatible with Ring anti-forgery middleware

Update the Server

Let’s start by adding the Sente dependencies in the project.clj file.

:dependencies [...
               [com.taoensso/sente "1.8.0"]]

We can now update the guestbook.routes.ws namespace to use ...