AS3 Preloader Cache Problem?

So the following code is Lee's implementation of a preloader which works fine first load but goes crazy when the browser loads a cached file, jumping from 0% to 100% randomly

Things I have tried to no avail:

• switching off gzip compression, tho I dont think it is on

• Using ENTER_FRAME instead of progress and complete

      l.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, loop);
      l.contentLoaderInfo.addEventListener(Event.COMPLETE, done);
      l.load(new URLRequest("http://www.foo.com/foo.swf"));
  
      function loop(e:ProgressEvent):void
      {
          perc = Math.round(e.bytesLoaded / e.bytesTotal * 100);
          lt.text = String(perc);
          if (perc >= 100)
              l.contentLoaderInfo.removeEventListener(ProgressEvent.PROGRESS, loop);
      }
  
      function done(e:Event):void
      {
          l.contentLoaderInfo.removeEventListener(Event.COMPLETE, done);
          addChild(l);
      }
  

I do not believe I am loading it more than once:

public function Main():void 
        {
            if (stage) init();
            else addEventListener(Event.ADDED_TO_STAGE, init);  
        }

        private function init(e:Event = null):void 
        {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            Security.allowDoma开发者_Go百科in("http://www.foo.com");
            preLoader();
        }

I discovered the problem happens because the files are hosted on an addon domain.

To fix this I changed the url to reference the main domain:

from

l.load(new URLRequest("http://www.foo.com/foo.swf"))

to

l.load(new URLRequest("http://foo.maindomain.com/foo.swf"))

and also add

Security.allowDomain("http://foo.maindomain.com");