Set streamState property to what the code expects. #5622
Don't know what issue is caused by the current code, but StreamState.RequestedUrl is currently set to the file extension of the Uri.
The code isn't expecting this, and isn't working as designed later, when it's checked for its url value.
By url only being set to the file extension part of the request - eg. avi if http://184.108.40.206/web/film.avi (line 91)