title: No CORS needed for mobile apps?
body: <p>When I make web applications, I usually have to add these headers to Express to allow CORS requests.</p>
  
  <pre><code>app.use((req, res, next) =&gt; {
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
    res.header('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');
    next();
  });
  </code></pre>
  
  <p>But with React Native mobile apps, I don't have to do that. Why is that so?</p>