title: Nodejs - SPDY push on request error
body: <p>I am having trouble launching my Node app. I get "TypeError: Cannot call method 'push' of undefined" error.
  Here is my code:</p>
  
  <pre><code>spdy.createServer(credentials, app).listen(app.get('port'), function(req, res) {
   res.push('public/js/bootstrap.min.js', {'content-type': 'application/javascript'}, function(err, stream) {
          stream.end('alert("hello from push stream!")');
        });
   res.push('public/js/jquery.min.js', {'content-type': 'application/javascript'}, function(err, stream) {
          stream.end();
        });
   res.push('public/css/bootstrap.min.css', {'content-type': 'text/css'}, function(err, stream) {
          stream.end();
        });
  
        // write main response body and terminate stream
        res.end('Hello World!');
  
  console.log('Express HTTPS SPDY server listening on port ' + app.get('port'));
  }   );
  </code></pre>
  
  <p>I am running SDPY version 1.19.2 and NodeJS version 0.10.25.</p>