title: Expressjs req.params undefined but req.req.params defined
body: <p>I'm working on a nodejs project express application. My route looks something like this:</p>
  
  <pre><code>router.get('/observe/:fileName', function(res, req){
  
      var reqFileName = req.params.fileName;
  
      console.log("GET /observe/" + reqFileName);
      res.end();
  
  }
  </code></pre>
  
  <p>The problem is that if I do a GET request on <code>localhost/observe/myFile</code> the variable <code>reqFileName</code> is undefined because <code>req.params.fileName</code> is undefined. But inspecting(using node-inspector) the <code>req</code> I can see that the <code>req</code> has a property called <code>req</code> that has <code>params</code>. so <code>req.req.params.fileName</code> will give my parameter value. Is this normal ?</p>