Simple web server to reverse anything in whitelist.

reverseAny.js

const http = require('http');
const https = require('https');
const url = require('url');
const whitelist = ['www.example.com'];

const server = http.createServer((req, res) => {
  const parsedUrl = url.parse(req.url);

  if (!parsedUrl.pathname.startsWith('/archive/http')) {
    console.error(`Received invalid request: ${req.method} ${req.url}`);
    res.writeHead(404);
    res.end();
    return;
  }

  const targetUrl = parsedUrl.pathname.substring(9);
  const hostname = url.parse(targetUrl).hostname;
  if (!whitelist.includes(hostname)) {
    console.warn(`Blocked request to non-whitelisted host: ${hostname}`);
    res.writeHead(403);
    res.end();
    return;
  }

  const options = url.parse(targetUrl);
  options.headers = {
    'User-Agent': req.headers['user-agent']
  };
  const httpOrHttps = targetUrl.startsWith('https') ? https : http;
  const proxyReq = httpOrHttps.request(options, (proxyRes) => {
    console.log(`Proxied request to ${targetUrl} with status ${proxyRes.statusCode}`);
    res.writeHead(proxyRes.statusCode, proxyRes.headers);
    proxyRes.pipe(res);
  });
  proxyReq.on('error', (err) => {
    console.error(`Proxy request to ${targetUrl} failed: ${err}`);
    res.writeHead(404);
    res.end();
  });
  req.pipe(proxyReq);
});

server.listen(9090, '127.0.0.1', () => {
  console.log('Server running at http://127.0.0.1:9090/archive/');
});