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, you’ll 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. You’ll 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 don’t 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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• 对于熟练掌握JavaScript（或许还有Node.js）的开发者，作者Andrew Lombardi在书中提供了有用的实践案例，帮助你快速掌握WebSocket API。你还将学习如何使用带有传输层安全（TLS）的WebSocket。
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• 了解如何在客户端应用程序中使用WebSocket API事件、消息、属性和方法
• 以WebSocket为通信层，在客户端和服务器上构建双向聊天应用程序
• 在WebSocket上为STOMP 1.0（面向文本的简单消息传输协议）创建一个子协议
• 为不支持WebSocket的旧版浏览器使用选项
• 利用TLS和其他工具保护你的WebSocket应用免受各种攻击载体的影响
• 通过学习WebSocket生命周期的各个方面来调试应用程序