public static WebSocketCreator create(WebSocketHandlerWrapper handlerWrapper) {
        return new SparkWebSocketCreator(handlerWrapper.getHandler());
    }
Creates a {@link WebSocketCreator} that uses the given handler class/instance for
the WebSocket connections.

@param handlerWrapper The wrapped handler to use to manage WebSocket connections.
@return The WebSocketCreator.
src/main/java/spark/embeddedserver/jetty/websocket/WebSocketCreatorFactory.java