Hi Staszek, I've found one issue in the CSS attribute parsing. Smartsprites can't handle image URL declaration where the is a semi colon in the URL like below : background-image : url('http://issues.carrot2.org/s/302/1/_/images/carrot2-clustering-engine.gif") background-image : url('jar:/images/carrot2-clustering-engine.gif") For the first URL, with the new ReourceHandler, we are able to retrieve the data over the web. For the second URL, it's a special syntax used by Jawr to retrieve resource for a specific generator. There is only one class to modify which is CssSyntaxUtils. I've add in attachement a diff for the change. Don't hesitate to tell me if something is not clear. Kind regards, Ibrahim