randomErrorProxy.mjs

import { createProxyMiddleware } from 'http-proxy-middleware';;
import express from 'express';

const app = express();

app.use((req, res, next) => {
    res.removeHeader('x-powered-by');
    console.log(`[${new Date().toLocaleString()}] ${req.ip}, ${req.method} ${req.path}, ${req.headers['user-agent']}`)
    // 这边可以进行随机的错误模拟。例如：
    if (Math.random() > 0.8) {
        res.status(500).send('boom');
        return;
    }

    next();
});

/**
 * @see https://www.npmjs.com/package/http-proxy-middleware
 */
app.use('/', createProxyMiddleware({
    // 👇 代理目标 (按需修改)
    target: 'http://example.com',
    changeOrigin: true,
    // 这里可以修改请求路径
    // pathRewrite: (path) => path.replace(/^\/api/, ''),
    onProxyRes: (pres, req, res) => {
        // 在这里可以覆盖代理返回数据的响应。例如，修改响应头：
        // pres.headers['cache-control'] = 'no-cache';
    },
    onError: (err, req, res, target) => {
        console.log(err);
    }
}));

// 👇 监听的本地端口
app.listen(23330, () => {
    console.log('Now running on port 23330...');
});