Answer with HTTP/1.0 until 1.1 is really implemented

Currently, the HTTP server answers with `1.1` but does not handle persistent connexions.
Because of this, well behaving client, expecting proper handling of the advertised 1.1 semantic do not work:
the incoming Request object does never trigger the `end` event.
This of course is because an HTTP/1.1 client never closes the socket connexion.