title: express.js res.redirect with masking
body: <p>In express.js, can I use <code>res.redirect</code> while performing masking.</p>
  
  <p>Example, my app is at <code>http://example.com</code>. I want <code>http://example.com/test</code> to redirect to <code>http://google.com</code> while keeping the URL as <code>http://example.com/test</code>.</p>
  
  <p>In other words, the user sees google's landing-page while URL == <code>http://example.com/test</code>.</p>