Does anyone know how you can force signalr to re-negotiate the transport?

Does anyone know how you can force signalr to re-negotiate the transport? if you're on websockets and that disconnects, it will renegotiate using say, long-polling - but if the websocket support comes back, it doesn't seem to ever re-negotiate and switch back to websockets. I know that the transport is meant to be internal and transparent, but if we prefer websockets, we'd like to use it and only use the others as a fallback; moving back to websockets later if it's available. I guess if it's using an alternate transport we could toggle a stop/start but that seems like the wrong way to approach it