bouncy_test.js

gistfile1.js

var bouncy = require('bouncy');

bouncy(function(req, bounce){
  if (req.headers.host === 'localhost' ){
    console.log(req.headers.host)
    bounce(3000);
  }
  else{
    var res = bounce.respond();
    res.write('error: bounce nowhere');
    res.end();
  }
}).listen(80);

executed Express server on port 3000
executed bouncy "sudo node bouncy_test.js"
access http://localhost/ shows a Express top page.