Making asynchronous HTTP requests from Webpages is an effective technique in bringing seemingly static pages to life.
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Asynchronous JavaScript and XML (AJAX) has become a popular technology in creating richer and more dynamic Web clients, and is often used to incorporate desktop features in the browser. However, the usual XMLHttpRequest-based AJAX clients suffer from the limitation of only being able to communicate to the server from where they are downloaded. This becomes problematic for deployment environments that span multiple domains. In addition, developers end up writing browser-specific code since each of the main browsers implements this XML request object differently.
The way people interact on the Web has changed drastically. Many Web applications currently being developed are open, collaborative, and in perpetual beta. Characteristics like these define "Web 2.0," with one of its more important characteristics being a rich browser client—one that resembles traditional desktop applications. Client-side technologies like JavaScript, which were relegated to doing menial client-side tricks/validations, have come to prominence and are playing an important role in delivering a richer experience to Web users.
There are several good resources on the Web about AJAX, but for the sake of completeness and setting the stage, we describe the technology briefly here: AJAX is a Web development technique for creating interactive Web applications. The intent is to make Webpages more responsive by exchanging small amounts of data with the server behind the scenes, so the entire Webpage does not have to reload each time the user makes a change.
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