title: Sometimes GET returns 304 instead of 200
body: <p>I am using node.js and mongodb.</p>
  
  <p>I seem to be receiving a 200 sometimes, and a 304 not modified other times.</p>
  
  <pre><code>router.get('/add-to-bag/:id', (req, res, next) =&gt; {
      req.session.bag.push(req.params.id);
      res.redirect('back');
      });
  });
  </code></pre>