proxy in javascript

index.tsx
const http = require('http');

// Target server
const targetHost = 'www.example.com';
const targetPort = 80;

// Create the HTTP server
const server = http.createServer((req, res) => {
  // Set the headers to pass along the request
  const headers = req.headers;
  headers['host'] = targetHost;

  // Create the options for the request to the target server
  const options = {
    hostname: targetHost,
    port: targetPort,
    path: req.url,
    method: req.method,
    headers: headers
  };

  // Send the request to the target server
  const proxyReq = http.request(options, (proxyRes) => {
    // Pass along the response from the target server
    res.writeHead(proxyRes.statusCode, proxyRes.headers);
    proxyRes.pipe(res, {
      end: true
    });
  });

  // Pipe the request data from the client to the target server
  req.pipe(proxyReq, {
    end: true
  });
});

// Start the HTTP server
const port = 3000;
server.listen(port, () => {
  console.log(`HTTP proxy server listening on port ${port}`);
});
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