问：如何将消息从spring被动websocket（服务器）发送到jswebsocket（客户端）？
我正在尝试将消息从标准spring被动websocket服务器发送到非被动js客户端。建立初始连接并将响应消息从服务器发送回客户端。但当我试图通过rest点调用custom方法向客户机发送消息时，消息并没有被发送。
流程是这样的，首先调用api rest端点来向处理程序发送消息给特定的客户机，然后客户机应该用restapi返回的响应进行响应。
查看了rsockets，但无法使用它们，因为我无法更改客户端，并且客户端只支持标准websockets。我还想知道使用被动服务器和客户端的轮询响应是否会提高性能，因为这看起来像是阻塞操作？
套接字处理程序：

@Component
public class ReactiveWebSocketHandler implements WebSocketHandler {
    Map<String, WebSocketSession> socketSessions = new HashMap<>();
    @Override
    public Mono<Void> handle(WebSocketSession session) {
        //Store current session in map.
        WebsocketContext.WEB_SOCKET_SESSIONS.put(session.getId(), session);
        Flux<WebSocketMessage> output = session.receive()
                .map(value -> session.textMessage("Subscription succesful, SessionId: " + session.getId()));
        return session.send(output);
    }
    public boolean sendMessageToClient(String sessionId) {
        //Get stored session and send message.
        WebSocketSession wss = WebsocketContext.WEB_SOCKET_SESSIONS.get(sessionId);
        var message = Mono.just(wss.textMessage("Server message"));
        wss.send(message);
        //for now true is returned but later this method should wait for answer from client in form of string
        return true;
    }
}

存储套接字会话的上下文。

public class WebsocketContext {
    public static Map<String, WebSocketSession> WEB_SOCKET_SESSIONS = new HashMap<>();
}

配置：

@Configuration
public class WebConfig {
    @Bean
    public HandlerMapping webSocketHandlerMapping() {
        Map<String, WebSocketHandler> map = new HashMap<>();
        map.put("/websocket",new ReactiveWebSocketHandler());
        SimpleUrlHandlerMapping handlerMapping = new SimpleUrlHandlerMapping();
        handlerMapping.setOrder(1);
        handlerMapping.setUrlMap(map);
        return handlerMapping;
    }
    @Bean
    public WebSocketHandlerAdapter handlerAdapter() {
        return new WebSocketHandlerAdapter();
    }
}