AS3のベーシック認証
var url:String = "URL";
var urlReq:URLRequest = new URLRequest(url);
var base64Encoder:Base64Encoder = new Base64Encoder;
base64Encoder.encodeUTFBytes("ID" + ":" + "パスワード");
var base64strings:String = base64Encoder.toString();
urlReq.requestHeaders = [new URLRequestHeader("Authorization", "Basic " + base64strings)];
var urlLoader:URLLoader = new URLLoader;
urlLoader.addEventListener(Event.COMPLETE,onCompete);
urlLoader.load(urlReq);
function onCompete(e:Event):void
{
var str:String = urlLoader.data as String;
trace(str);
}