title: Create React App adding CORS header
body: <p>I'm trying to figure out where to add the "Access-Control-Allow-Origin" header to my create-react-app dev Server config.</p>
  
  <p>So far I'm adding it to <code>config/webpackDevServer.config.js</code> without much luck.</p>
  
  <p>Any idea on where I could add it? </p>
  
  <p>thanks!</p>