By Billy Hoffman
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W HAT A JAX I S N OT It is worth noting not just what Ajax is, but what it is not. Most people understand that Ajax is not a programming language in itself, but rather a collection of other technologies. What may be more surprising is that Ajax functionality is not something that necessarily needs to be turned on by the server. It is client-side code that makes the requests and processes the responses. As we will see, client-side code can be easily manipulated by an attacker. In October 2005, the Web site MySpace was hit with a Web virus.
The getHttpRequest method creates an XMLHttpRequest object, which is the object that allows the page to make asynchronous requests to the server. If one class could be said to be the key to Ajax, it would be XMLHttpRequest (sometimes abbreviated as XHR). Some of the key properties and methods of XHR are open Specifies properties of the request, such as the HTTP method, to be used and the URL to which the request will be sent. It is worth noting that open does not actually open a connection to a Web server; this is done when the send method is called.