Chapter 5Real-Time Messaging with WebSockets
In this chapter we’ll take a look at using WebSockets for client-server communication. In the traditional Ajax approach, the client first sends a message to the server and then handles the reply using an asynchronous callback. WebSockets provide the ability for the web server to initiate the message exchange with the client.
Currently, our guestbook application does not provide a way to display messages generated by other users without reloading the page. If we wanted to solve this problem using Ajax, our only option would be to poll the server and check if any new messages are available since the last poll. This is inefficient since the clients end up continuously polling the server regardless ...
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