var request : URLRequest = new URLRequest ( YOUR URL HERE );
var loader : URLLoader = new URLLoader ();
loader.addEventListener( Event.COMPLETE, handleLoaderComplete );
loader.addEventListener(HTTPStatusEvent.HTTP_STATUS, ldrStatus);
loader.load ( request );
protected function ldrStatus(evt:HTTPStatusEvent):void
{
trace(evt.status)
}
protected function handleLoaderComplete(event:Event):void
{
trace("COMPLETE");
}
попробуйте код выше, evt.status должен дать 200, в случае успеха.