Port-forwarding in < 10 lines of node.js

fwd.js

var net = require('net');
var listen = process.argv[2] || 443;
var forwardTo = process.argv[3] || 4443;
net.createServer(function(conn) {
  var fwd = net.createConnection({ host: '127.0.0.1', port: forwardTo });
  conn.pipe(fwd);
  fwd.pipe(conn);
}).listen(listen);