即使在启用express CORS中间件之后，axios请求上的Access-Control-Allow-Origin错误

npm install cors

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

const app = express();

// 使用CORS中间件
app.use(cors());

// 或者更细粒度的配置
app.use(cors({
  origin: 'http://example.com', // 允许的源
  methods: 'GET,HEAD,PUT,PATCH,POST,DELETE', // 允许的HTTP方法
  credentials: true, // 允许发送凭据（如cookies）
}));

app.get('/', (req, res) => {
  res.send('Hello World!');
});

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

app.options('*', cors()); // 对所有路由启用CORS预检

app.options('/your-route', cors({
  origin: 'http://example.com',
  methods: 'GET,HEAD,PUT,PATCH,POST,DELETE',
  credentials: true,
}));

npm install http-proxy-middleware

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

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