如何在调用API内部保存值意图？

// 设置Cookie
document.cookie = "username=John Doe; expires=Thu, 18 Dec 2023 12:00:00 UTC; path=/";

// 读取Cookie
function getCookie(name) {
    const value = `; ${document.cookie}`;
    const parts = value.split(`; ${name}=`);
    if (parts.length === 2) return parts.pop().split(';').shift();
}

// 设置Local Storage
localStorage.setItem('username', 'John Doe');

// 读取Local Storage
const username = localStorage.getItem('username');

const express = require('express');
const session = require('express-session');
const app = express();

app.use(session({
    secret: 'secret-key',
    resave: false,
    saveUninitialized: true
}));

app.get('/set', (req, res) => {
    req.session.username = 'John Doe';
    res.send('Session set');
});

app.get('/get', (req, res) => {
    res.send(`Username: ${req.session.username}`);
});

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