October 2012
Intermediate to advanced
392 pages
9h 59m
English
Content preview from Learning NodeBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter 13. WebSockets and Socket.IO
In this chapter, we’re working in both the client and server environments, because both are necessary when it comes to WebSockets and Socket.IO.
WebSockets is a relatively new web technology that enables bidirectional, real-time communication directly from within a client to a server application, and back again. The communication occurs over TCP (Transmission Control Protocol), via sockets. The Socket.IO libraries provide the support necessary to implement this technology. Not only does Socket.IO provide a module to use in your Node application, but it also provides a client-side JavaScript library to enable the client end of the communication channel. For an added bonus, it also works as an Express middleware.
In this chapter I’ll introduce WebSockets more fully by demonstrating how Socket.IO works, both in the client and in the server.
WebSockets
Before jumping into using Socket.IO, I want to provide a quick overview of WebSockets. To do that, I also need to explain bidirectional full-duplex communication.
The term full duplex describes any form of data transmission that allows communication in both directions. The term bidirectional means that both endpoints of a transmission can communicate, as opposed to unidirectional communication, when one end of a data transmission is a sender and all other endpoints are receivers. WebSockets provides the capability for a web client, such as a browser, to open up bidirectional full-duplex communication with ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.