如果没有提供凭证，如何使用express-basic-auth使我的应用程序返回401？

npm install express express-basic-auth

const express = require('express');
const basicAuth = require('express-basic-auth');

const app = express();

const authMiddleware = basicAuth({
    users: { 'username': 'password' }, // 替换为实际的用户名和密码
    unauthorizedResponse: (req) => {
        return req.auth ? 'Invalid credentials' : 'No credentials provided';
    }
});

app.get('/protected', authMiddleware, (req, res) => {
    // 在这里处理受保护的路由逻辑
    res.send('Authenticated');
});

app.listen(3000, () => {
    console.log('Server started on port 3000');
});