I make web site with express and I need gravatar image, 
so 
<https://npmjs.org/package/gravatar>

`npm install gravatar`

and my app.js

in my `app.js`

```
var gravatar = require('gravatar');
http.createServer(app).listen(app.get('port'), function(){
  var secureUrl = gravatar.url('example@gmail.com' ,  {s: '100', r: 'x', d: 'retro'}, true);
  console.log(secureUrl);
  console.log('Express server listening on port ' + app.get('port'));
});

```

working very well, and Browser show me nice picture.

but I use express, and use post method like this,

```
app.post('/signup', routes.signupResult);

```

and full of my example source `index.js`

```
exports.signupResult = function(req, res){
  res.render('user/signup-result', {
  title: 'Node-Chat Sign up'
  , name: req.body.name
  , email: req.body.email
  , password: req.body.password
  , password: req.body.passwordConfirmation
});

```

};

I want my signup-result.jade will use gravatar profile image...
what can I do my `app.js` to `routes/index.js` edit for gravatar?