1. express ๋ก ์๋ฒ ๊ตฌ์ถ express ? node.js์ ํ๋ ์์ํฌ ์๋ฒ ์ฌ์ด๋ ํ๋ ์์ํฌ๋ก Node.js์ API๋ฅผ ๋จ์ํํ๊ณ , ์ฝ๊ฒ ์๋ฒ ๊ตฌ์ถ ๊ฐ๋ฅ express application์ผ๋ก๋ถํฐ http server ์์ฑ import express from 'express'; import http from 'http'; const app = express(); const server = http.createServer(app); 2. http ์๋ฒ ์์, webSocket ์๋ฒ ๊ตฌ์ถ -> ๊ฐ์ ํฌํธ ์ด์ฉ import ws from 'ws'; //http ์๋ฒ ์ ๋ฌ const wss = new we.WebSocketServer({ server }); 3. WebSocket Connection :..