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Most applications for the Flash platform make some kind of HTTP request. An HTTP request may involve specifying a URL to navigate to or communicate with, and variables that may be passed using GET or POST methods. The most common HTTP request in Flash applications is navigating to a URL. This is done using the URLRequest class and the navigateToURL() function.
The URLRequest class handles all communication involved in making an HTTP request. The URLRequest class used by other class methods of the ActionScript API requires an HTTP request, such as the navigateToURL and Loader classes.