불필요 삭제

client/src/components/Room/Screen.js

@@ -31,12 +31,7 @@ const Screen = () => {
   };
 
   useEffect(() => {
-    let newSocket = io("http://localhost:8080", {
-      withCredentials: true,
-      extraHeaders: {
-        "my-custom-header": "abcd",
-      },
-    });
+    let newSocket = io("http://localhost:8080");
     let localStream;
     newSocket.on("userEnter", (data) => {
       createReceivePC(data.id, newSocket);

server/app.js

@@ -14,8 +14,6 @@ const io = new Server(server, {
   cors: {
     origin: "http://localhost:3000",
     methods: ["GET", "POST"],
-    allowedHeaders: ["my-custom-header"],
-    credentials: true,
   },
 });
 app.use(express.json());