cdn加速session丢失

http {
    upstream backend {
        server backend1.example.com;
        server backend2.example.com;
        sticky cookie srv_id expires=1h domain=.example.com path=/;
    }

    server {
        listen 80;

        location / {
            proxy_pass http://backend;
        }
    }
}

const express = require('express');
const session = require('express-session');
const RedisStore = require('connect-redis')(session);
const redis = require('redis');

const app = express();
const redisClient = redis.createClient();

app.use(session({
    store: new RedisStore({ client: redisClient }),
    secret: 'your-secret-key',
    resave: false,
    saveUninitialized: false
}));

app.get('/', (req, res) => {
    if (req.session.views) {
        req.session.views++;
        res.send(`Views: ${req.session.views}`);
    } else {
        req.session.views = 1;
        res.send('Welcome to the session demo. Refresh!');
    }
});

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