open fun websocketAbs(url: String, headers: MultiMap, version: WebsocketVersion, subProtocols: String, wsConnect: Handler<WebSocket>, failureHandler: Handler<Throwable>): HttpClient
Connect a WebSocket with the specified absolute url, with the specified headers, using the specified version of WebSockets, and the specified websocket sub protocols.
version - the websocket version
subProtocols - the subprotocols to use
wsConnect - handler that will be called with the websocket when connected
failureHandler - handler that will be called if websocket connection fails
Return
a reference to this, so the API can be used fluently