title: Server-side "redirect" in express.js
body: <p>Say I've got a route set up for /x/AAA. How do I get requests for /y/AAA to be handled as for /x/AAA but with the code also knowing that it originally came via /y/ so that it can, for example, enable debugging.</p>
  
  <p>I'm basically after server-side redirects, similar to Server.Transfer in ASP.NET.</p>