title: No X-AppEngine-Region in AppEngine App headers?
body: <p>I am trying to get the Region an Country in the request. I thought it was possible to get the <code>X-AppEngine-Region</code> and <code>X-AppEngine-Country</code> headers in every request to AppEngine, but they are missing. Sometimes the headers are provisional and sometimes they're like this (only listing keys):</p>
  
  <pre><code>alt-svc 
  content-length 
  content-type 
  date 
  etag 
  server 
  status 
  via 
  x-powered-by 
  </code></pre>
  
  <p>Here is my code. What do I have to do to get the Region and Country as well?</p>
  
  <pre><code>app.get('/', (req, res) =&gt; {
    res.status(200).send(req.headers['X-AppEngine-Region'] || '');
  });
  
  app.post('/ping', (req, res) =&gt; {
    res.status(200).send(req.headers['X-AppEngine-Region'] || '');
  });
  </code></pre>