title: Authenticating the request header with Express
body: <p>I want to verify that all our get requests have a specific token in their authentication header.</p>
  
  <p>I can add this to our get endpoints:</p>
  
  <pre><code>app.get('/events/country', function(req, res) {
      if (!req.headers.authorization) {
      return res.json({ error: 'No credentials sent!' });
      }
  </code></pre>
  
  <p>Is there any better way to handle this in NodeJS/Express without changing every endpoint? something like a before-filter/AOP approach?</p>