flash is suck in urlStream or fileRef.upload

urlStream is always good, it trigger the browser request to server, but very raw and cannot detect the upload progress (no progress event fire during upload) ( cal the speed and use Timer to pretend the progress bar )

but fileRef.upload is really poor, it use its user agent, so it is independent to browser, so no session can be save, it make a new session i think

judge yourself use which class then 🙂