[nodejs] A simple example how to write a proxy server piping server request to client request / client response back to server response.

node-proxy-server.js

// from: http://book.mixu.net/node/ch10.html

'use strict';

const http = require('http');
const url = require('url');

const server = http.createServer((sreq, sres) => {
  const { pathname } = url.parse(sreq.url);
  const opts = {
    host: 'example.com',
    port: 80,
    path: pathname,
    method: sreq.method,
    headers: sreq.headers,
  }

  const creq = http.request(opts, (cres) => {
    // passthrough status code and headers
    sres.writeHead(cres.statusCode, cres.headers);
    cres.pipe(sres);
  });

  sreq.pipe(creq);
});

server.listen(8080, 'localhost', () => {
  console.log('server is running');
});

It doesn't work for 443 port because hostname does not match