title: React proxy does not work even though config is set properly
body: <p>I have tried multiple things</p>
  
  <p>I added </p>
  
  <pre><code>"proxy": "http://localhost:5000/"
  </code></pre>
  
  <p>to package.json,
  and even</p>
  
  <pre><code>devServer: {
      historyApiFallback: true,
       proxy: {
       "/": "http://localhost:5000"
       }
    }
  </code></pre>
  
  <p>to webpack.config.dev.js</p>
  
  <p>However, none of these seem to work. When I go to localhost:3000/age (one of my routes), the backend does not receive any request even though the React component is tied to it AND I have the proxy set in package.json</p>
  
  <p>My express app listens on route 5000, and I am visiting it through my browser as localhost:3000/age and also have tried localhost:5000/age but don't work</p>