我正在使用nextjs在一个web应用程序中实现pusher。它在我的开发环境中按预期工作。但是当我将它部署到vercel时，它不能正常工作。只有在浏览器中刷新页面时才能看到结果。
这是客户端的实现：

useEffect(() => {

    const pusher = new Pusher(`${process.env.PUSHER_KEY}`, {
        cluster: `${process.env.PUSHER_CLUSTER}`,
        useTLS: true
    });

    const channel = pusher.subscribe('franks-auto-spa');
    channel.bind('cancel-wash', data => {
        console.log(data.date);
        removeWash(data.date);
    });

}, []);

下面是API的实现：

export default async (req, res) => {

    const connection = await mysql.createConnection(process.env.DATABASE_URL);
    console.log(req.body.date);
    const result = await connection.query('DELETE FROM ongoing WHERE date = ?', [req.body.date]);
    console.log(result);

    const pusher = new Pusher({
        appId: `${process.env.PUSHER_ID}`,
        key: `${process.env.PUSHER_KEY}`,
        secret: `${process.env.PUSHER_SECRET}`,
        cluster: `${process.env.PUSHER_CLUSTER}`,
        useTLS: true
    });

    pusher.trigger('franks-auto-spa', 'cancel-wash', req.body);
    res.json({message: 'Wash deleted deleted...'});
}

我是否缺少Vercel中的任何配置？