import SockJS from "sockjs-client";
import Stomp from "stompjs"; 

    connection() {
            // 
            this.socket = new SockJS("http://192.168.6.67:8081/endpoint");
            this.stompClient = Stomp.over(this.socket);
            // websocket
            this.stompClient.connect({}, () => {
                this.stompClient.subscribe("/user/39/message", (msg) => { 
                    console.log(222)
                    console.log(msg.body); 
                });
            }, (err) => {
                console.log(err)
            });
        },

I don"t know if the things on my front end are wrong. I can use one-to-many ("/ topic/getResponse"), but not one-to-one ("/ user/39/message"). Please give me some advice