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Fixing AJAX: XMLHttpRequest Considered Harmful
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11/09/2005, By Jason Levitt
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AJAX applications wouldn't be possible (or, at least, wouldn't be nearly as cool) without the XMLHttpRequest object that lets your JavaScript application make GET, POST, and other types of HTTP requests from within the confines of a web browser. All of the most interesting AJAX applications that have appeared in the past couple of years use the XMLHttpRequest object extensively to give users a responsive in-browser experience without the messiness of traditional HTML forms posting.
A word of caution here: there is a good reason why XMLHttpRequests are restricted. Allowing them to freely access any domain from within a web page opens up users to potential security exploitation. Not surprisingly, these three hacks, which offload the request to your web server, potentially threaten to disparage your web server's identity, if not its contents. Caution is advised before deploying them.
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