I'm having trouble proxies websocket using http-proxy-middleware. The error I got was Websocket connection to https://api.dsm-staging.test.site failed. Here's the code I'm using in express :

const { createProxyMiddleware } = require("http-proxy-middleware");

const options = {
  target: "https://api.dsm-staging.test.site",
  changeOrigin: true,
  ws: true,
};

const proxy = createProxyMiddleware(options);
app.use("/v1/*", proxy);

This is my code in front end :

this.socket = io("https://api.dsm-staging.app.test.site", {
        reconnectionAttempts: 5,
        reconnectionDelayMax: 10000,
        extraHeaders: {
          Authorization: `Bearer ${token}`,
        },
        transports: ["websocket"],
 });

 this.socket.on("connect", () => {
    console.log(this.socket.connected);
  });