I've just read about SLING-613 and thought it's the right moment to raise awareness about Flash/Flex limitations. Besides other limitations, Flash cannot handle any HTTP status besides 200. A solution that has established is to tunnel every response in status 200. For example, Alfresco Webscripts handle this with a switch in the HTTP request header, http://wiki.alfresco.com/wiki/Web_Scripts#Forcing_Success_Response_Status .
So it boils down to the question whether Flex/Flash support is an issue for Sling? Marc
