为什么我的flex图像控件不会显示我的图像？

I have created an ashx handler that returns an image to my flex app. If I go directly to the url for example (www.mysite.com/handler.ashx?id=34) the browser will display the image. If you set the source of an image control in flex to the same address. I get "Error #2124: Loaded file is an unknown type.". Any hintsI have created an ashx handler that returns an