npm install http-proxy --save

const http = require('http');
const httpProxy = require('http-proxy');
//創(chuàng)建一個代理服務(wù)
const proxy = httpProxy.createProxyServer();
//創(chuàng)建http服務(wù)器并監(jiān)聽8888端口
let server = http.createServer(function (req, res) {
  //將用戶的請求轉(zhuǎn)發(fā)到本地9999端口上
  proxy.web(req, res, {
    target: 'http://localhost:9999'
  });
  //監(jiān)聽代理服務(wù)錯誤
  proxy.on('error', function (err) {
    console.log(err);
  });
});
server.listen(8888, '0.0.0.0');

const http = require('http');
http.createServer(function (req, res) {
  res.end('port : 9999');
}).listen(9999, '0.0.0.0');

const http = require('http');
const httpProxy = require('http-proxy');
//創(chuàng)建一個代理服務(wù)
const proxy = httpProxy.createProxyServer();
//虛擬主機
const hosts = {
  'www.a.me': 'http://localhost:8888',
  'www.b.me': 'http://localhost:9999',
};
//創(chuàng)建http服務(wù)器并監(jiān)聽80端口
let server = http.createServer(function (req, res) {
  //獲取主機名
  let host = req.headers['host'];
  host = host.split(':')[0];
  //根據(jù)主機名，找到要代理的服務(wù)
  let target = hosts[host];
  if (target) {
    proxy.web(req, res, {
      target: target
    });
    proxy.on('error', function (err) {
      console.log(err);
    });
  } else {
    res.end('end');
  }
});
server.listen(80, '0.0.0.0');

const http = require('http');
http.createServer(function (req, res) {
  res.end('port : 8888');
}).listen(8888, '0.0.0.0');

const http = require('http');
http.createServer(function (req, res) {
  res.end('port : 9999');
}).listen(9999, '0.0.0.0');