title: pre-flight OPTIONS request for CORS
body: <p>I use a middle call cors like this in development </p>
  
  <pre><code>app.use(cors({origin: 'http://localhost:8100'}));
  </code></pre>
  
  <p>and for every route request I start to see the 2 request:</p>
  
  <p><a href="https://i.stack.imgur.com/6MXKA.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6MXKA.jpg" alt="enter image description here"></a></p>
  
  <p>Will this still happen in production? Is it a problem? </p>