Both of these applications incorporate many of the techniques discussed throughout the book. The second, called AjaxMail, is an Ajax-enabled email system. The first, FooReader.NET, is an Ajax-powered RSS reader. The last part of the book walks through the creation of two full-fledged Ajax web applications. Ajax debugging techniques are also discussed. A chapter introducing a request management framework explores how to manage all of the requests inside of an Ajax application. Also included is a discussion on web services and how they may be used to perform Ajax techniques. Different data transmission formats, including plain text, HTML, XML, and JSON are discussed for their advantages and disadvantages. Once a basic understanding of the various request types is discussed, the book moves on to provide in-depth examples of how and when to use Ajax in a web site or web application. To make this discussion clearer, a brief overview of HTTP requests and responses is included. Request brokers such as hidden frames, dynamic iframes, and XHR are compared and contrasted, explaining when one method should be used over another. After this introduction, the book moves on to cover the implementation of specific Ajax techniques. A detailed discussion of how frames, JavaScript, cookies, XML, and XMLHttp requests (XHR) related to Ajax is included. The book begins by exploring the roots of Ajax, covering how the evolution of the web and new technologies directly led to the development of Ajax techniques. Professional Ajax 2nd Edition provides a developer-level tutorial of Ajax techniques, patterns, and use cases.

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