By Billy Hoffman
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Additional info for Ajax Security
Once a response is received from the asynchronous request, the data or page fragment contained in the response has to be inserted back into the current page. This is accomplished by making modifications to the DOM. getElementById to find the HTML span in which the time was displayed. The handleCurrentTimeChanged method then called additional DOM methods to create a text node if necessary and then modify its contents. This is nothing new or revolutionary; but the fact that the dynamic content can be refreshed from the server and not be included with the initial response makes all the difference.
Worse, the debitAccount function works the same way. It would be possible to completely wipe out all of the money in any user’s account. The existence of a server API also increases the attack surface of the application. An application’s attack surface is defined as all of the areas of the application that an attacker could potentially penetrate. The most commonly attacked portions of any Web application are its inputs. For traditional Web applications, these inputs include any form inputs, the query string, the HTTP request cookies, and headers, among others.
Complete page postbacks were still required to fetch new data. This made it impractical to use DHTML for applications like map and direction applications, because too much data—potentially gigabytes worth—needed to be downloaded to the client. This also made it impossible to use DHTML for applications that need to be continuously updated with fresh data, like stock tickers. It was not until the invention of XHR and Ajax that applications like these could be developed. AJAX:THE GOLDILOCKS OF ARCHITECTURE So, where does Ajax fit into the architecture scheme?