npm install http-proxy

var http = require('http'), httpProxy = require('http-proxy');// 新建一個代理 Proxy Server 對象var proxy = httpProxy.createProxyServer({});// 捕獲異常proxy.on('error', function (err, req, res) { res.writeHead(500, { 'Content-Type': 'text/plain' }); res.end('Something went wrong. And we are reporting a custom error message.');});// 另外新建一個 HTTP 80 端口的服務(wù)器，也就是常規(guī) Node 創(chuàng)建 HTTP 服務(wù)器的方法。// 在每次請求中，調(diào)用 proxy.web(req, res config) 方法進行請求分發(fā)Create your custom server and just call `proxy.web()` to proxy// a web request to the target passed in the options// also you can use `proxy.ws()` to proxy a websockets request//var server = require('http').createServer(function(req, res) { // You can define here your custom logic to handle the request // and then proxy the request. var host = req.url; host = url.parse(host); host = host.host;  console.log("host:" + req.headers.host); console.log("client ip:" + (req.headers['x-forwarded-for'] || req.connection.remoteAddress));  proxy.web(req, res, { target: 'http://localhost:8080' });});console.log("listening on port 80")server.listen(80);