[Users] SpiceHTML5, noVNC console and Spice Proxy mixable?

Hello, I already have a thread regarding SpiceHTML5 open and where I'm going to give further feedback as requested. In the mean time I would like to ask if the three features in the subject are completely mixable or not, as in the next days I'm going to test them all and I would like to start from consistent setup and not to give wrong answers based on wrong initial setup. If I understood correctly, both SpiceHTML5 and noVNC console are based on websocket proxy through the config parameter called WebSocketProxy and I can consolidate this proxy on the engine . SO that I can in the same environment use both. Correct? Coming then to Spice Proxy, managed by config parameter "SpiceProxyDefault", my questions are: - is it mixable with the two above or are they mutually exclusive? - can I configure the engine itself to be the proxy, installing squid on it? - If yes, what would be correct parameter for SpiceProxyDefault: localhost:3128 or engine_hostname.domainname:3128? If both are ok, I think it is more convenient to use localhost, correct? Thanks in advance, Gianluca