Andrew Lombardi - WebSocket: Lightweight Client-Server Communications
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Until recently, creating desktop-like applications in the browser meant using inefficient Ajax or Comet technologies to communicate with the server. With this practical guide, youll learn how to use WebSocket, a protocol that enables the client and server to communicate with each other on a single connection simultaneously. No more asynchronous communication or long polling!
For developers with a good grasp of JavaScript (and perhaps Node.js), author Andrew Lombardi provides useful hands-on examples throughout the book to help you get up to speed with the WebSocket API. Youll also learn how to use WebSocket with Transport Layer Security (TLS).
- Learn how to use WebSocket API events, messages, attributes, and methods within your client application
- Build bi-directional chat applications on the client and server with WebSocket as the communication layer
- Create a subprotocol over WebSocket for STOMP 1.0, the Simple Text Oriented Messaging Protocol
- Use options for older browsers that dont natively support WebSocket
- Protect your WebSocket application against various attack vectors with TLS and other tools
- Debug applications by learning aspects of the WebSocket lifecycle
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by Andrew Lombardi
Copyright 2015 Mystic Coders, LLC. All rights reserved.
Printed in the United States of America.
Published by OReilly Media, Inc. , 1005 Gravenstein Highway North, Sebastopol, CA 95472.
OReilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (http://safaribooksonline.com). For more information, contact our corporate/institutional sales department: 800-998-9938 or corporate@oreilly.com .
- Editors: Simon St. Laurent and Brian MacDonald
- Production Editor: Colleen Lobner
- Copyeditor: Kim Cofer
- Proofreader: Sharon Wilkey
- Indexer: Wendy Catalano
- Interior Designer: David Futato
- Cover Designer: Karen Montgomery
- Illustrator: Rebecca Demarest
- September 2015: First Edition
- 2015-09-04: First Release
See http://oreilly.com/catalog/errata.csp?isbn=9781449369279 for release details.
The OReilly logo is a registered trademark of OReilly Media, Inc. WebSocket, the cover image of a sea anemone, and related trade dress are trademarks of OReilly Media, Inc.
While the publisher and the author have used good faith efforts to ensure that the information and instructions contained in this work are accurate, the publisher and the author disclaim all responsibility for errors or omissions, including without limitation responsibility for damages resulting from the use of or reliance on this work. Use of the information and instructions contained in this work is at your own risk. If any code samples or other technology this work contains or describes is subject to open source licenses or the intellectual property rights of others, it is your responsibility to ensure that your use thereof complies with such licenses and/or rights.
978-1-449-36927-9
[LSI]
For Joaqun
The Web has grown up.
In the old days, we used to code design-rich websites using an endless mess of nested tables. Today we can use a standards-based approach with Cascading Style Sheets (CSS) to achieve designs not possible in the Webs infancy. Just as CSS ushered in a new era of ability and readability to the design aspects of a site, WebSocket can do that for bidirectional communication with the backend.
WebSocket provides a standards-based approach to coding for full-duplex bidirectional communication that replaces the age-old hacks like Comet and long polling. Today we have the ability to create desktop-like applications in a browser without resorting to methods that exhaust server-side resources.
In this book, youll learn the simple ways to deliver on bidirectional communication between server and client, and do so without making the IT guy cry.
This book is for programmers who want to create web applications that can communicate bidirectionally between server and client and who are looking to avoid using hacks that are prevalent on the Web today. The promise of WebSocket is a better way, based on standards and supported by all modern browsers, with sensible fallback options for those who need to support it. For those who havent considered WebSocket, put down the Comet tutorial you have been reading.
This book is appropriate for novices and experienced users. I assume that you have a programming background and are familiar with JavaScript. Experience with Node.js is helpful, but not required. This book will also benefit those who are charged with maintaining servers that run WebSocket code, and are responsible for ensuring the security of the infrastructure. You need to know the potential pitfalls of integrating WebSocket and what that means for you. The earlier chapters may be of less use to you, but the last three chapters will give you enough knowledge to know what is coming across your network.
Ive been in the trenches, and have had to implement acceptable hacks to achieve bidirectional communication for clients who needed the functionality. It is my hope that I can show you a better way, one that is based on standards and proves simple to implement. For several clients over the years, I have successfully deployed this books approach to communicating with the backend by using WebSocket rather than long polling and have achieved the goals I was after.
I often read a book by skimming and pulling out the relevant pieces to use as a reference while coding. If youre actually reading this preface, the following list will give you a rough idea of each chapters goals:
Chapters provide a quick-start guide with instructions on dependencies needed throughout the book, and introduces you to the JavaScript API.
presents a full example with client and server code using chat.
In you write your own implementation of a standard protocol and layer it on top of WebSocket.
is essential for those who need to support older browsers.
Finally, Chapters dive into aspects of security, debugging, and an overview of the protocol.
The following typographical conventions are used in this book:
ItalicIndicates new terms, URLs, email addresses, filenames, and file extensions.
Constant widthUsed for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords.
Constant width boldShows commands or other text that should be typed literally by the user.
Constant width italicShows text that should be replaced with user-supplied values or by values determined by context.
This element signifies a general note.
Supplemental material (code examples, exercises, etc.) is available for download at https://github.com/kinabalu/websocketsbook.
This book is here to help you get your job done. In general, if example code is offered with this book, you may use it in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.
We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: WebSocket by Andrew Lombardi (OReilly). Copyright 2015 Mystic Coders, LLC, 978-1-4493-6927-9.
If you feel your use of code examples falls outside fair use or the permission given above, feel free to contact us at .
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