default void configureWebSockets(Map<String, WebSocketHandlerWrapper> webSocketHandlers,
                                     Optional<Long> webSocketIdleTimeoutMillis) {

        NotSupportedException.raise(getClass().getSimpleName(), "Web Sockets");
    }
Configures the web sockets for the embedded server.

@param webSocketHandlers          - web socket handlers.
@param webSocketIdleTimeoutMillis - Optional WebSocket idle timeout (ms).
src/main/java/spark/embeddedserver/EmbeddedServer.java