Vaadin StreamVariable usage

I have tried to use a StreamVariable in my WebCam add-on to stream picture from the flash side to vaadin without using the current UPLOAD hack… The my StreamVariable is in the client side this literal
“app://APP/UPLOAD/PID_SVAADIN_WEBCAM_PID/postTargetUri/7d8abb3c-0715-4569-acbe-7a84b2b5ae32”

What might be the correct way to call the uri from the e.g. flash side? I have tried different compinations of streamvariable uri and application url, but so far without success…

Johannes

Reply to myself: contextroot catenated with streamvariable literal starting from /APP…

In my case: http://localhost:8081/WebCam/APP/UPLOAD/PID_SVAADIN_WEBCAM_PID/postTargetUri/ba1dcffe-1623-4655-9e77-4b56531d9333;jsesionid=F5A1194AD23C964A8DC3212CF9F356E2