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

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