public void webSocket(String path, Class<?> handlerClass) {
        addWebSocketHandler(path, new WebSocketHandlerClassWrapper(handlerClass));
    }
Maps the given path to the given WebSocket handler class.
<p>
This is currently only available in the embedded server mode.

@param path         the WebSocket path.
@param handlerClass the handler class that will manage the WebSocket connection to the given path.
src/main/java/spark/Service.java