September 2015
Intermediate to advanced
150 pages
3h 9m
English
Content preview from WebSocket
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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.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 1. Quick Start
The WebSocket API and protocol is defined in RFC 6455. WebSocket gives you a bidirectional, full-duplex communications channel that operates over HTTP through a single socket.
Existing hacks that run over HTTP (like long polling) send requests at intervals, regardless of whether messages are available, without any knowledge of the state of the server or client. The WebSocket API, however, is different—the server and client have an open connection from which they can send messages back and forth. For the security minded, WebSocket also operates over Transport Layer Security (TLS) or Secure Sockets Layer (SSL) and is the preferred method, as you will see in Chapter 6.
This book will help you understand the WebSocket API, the protocol, and how to use it in your web applications today.
In this book, JavaScript is used for all code examples. Node.js is used for all server code, and for occasional client code or tests when a browser is extraneous to getting a sense of functionality. To understand the examples, you’ll need some level of proficiency with JavaScript. If you’d like to study up on JavaScript, I recommend Douglas Crockford’s JavaScript: The Good Parts (O’Reilly).
Node.js has been so prevalant in the past several years that the barriers to entry for the examples in this book are remarkably low. If you’ve done any development for the Web, chances are good that you’ve developed in JavaScript or at least understand it. The use of Node.js and JavaScript ...
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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.