如何在没有http服务器的情况下在内部使用koa应用回调？

node -v
koa -v

npm init -y

npm install koa koa-router

const Koa = require('koa');
const Router = require('koa-router');

const app = new Koa();
const router = new Router();

// 定义回调路由
router.get('/callback', async (ctx) => {
  ctx.body = 'Hello, this is the callback route!';
});

// 使用路由中间件
app.use(router.routes()).use(router.allowedMethods());

// 启动应用
app.listen(3000, () => {
  console.log('Server is running on http://localhost:3000');
});

node app.js