js跨域获取session

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

app.use((req, res, next) => {
  res.header('Access-Control-Allow-Origin', 'http://example.com'); // 允许的源
  res.header('Access-Control-Allow-Credentials', 'true'); // 允许发送Cookie
  next();
});

app.get('/session', (req, res) => {
  res.json({ sessionId: req.sessionID });
});

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

fetch('http://yourserver.com/session', {
  method: 'GET',
  credentials: 'include' // 发送Cookie
})
.then(response => response.json())
.then(data => console.log(data));

app.get('/session', (req, res) => {
  const data = { sessionId: req.sessionID };
  const callback = req.query.callback;
  res.send(`${callback}(${JSON.stringify(data)})`);
});

<script>
function handleResponse(data) {
  console.log(data);
}
</script>
<script src="http://yourserver.com/session?callback=handleResponse"></script>

const express = require('express');
const { createProxyMiddleware } = require('http-proxy-middleware');

const app = express();

app.use('/api', createProxyMiddleware({
  target: 'http://yourserver.com',
  changeOrigin: true,
  pathRewrite: {
    '^/api': ''
  }
}));

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

fetch('/api/session', {
  method: 'GET',
  credentials: 'include'
})
.then(response => response.json())
.then(data => console.log(data));