title: setting PORT and HOST manually for facebook/create-react-app production build
body: <p>i used facebook/create-react-app to create a react application and successfully got production build running on <a href="http://localhost:5000" rel="noreferrer">http://localhost:5000</a>.</p>
  
  <p>my question is is there any way to change the 5000 PORT in this production build ?</p>
  
  <p>according to the Advanced Configurations, there is no way to change HOST and PORT in production, only available for the development</p>
  
  <blockquote>
    <blockquote>
      <blockquote>
        <p><a href="https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/README.md#advanced-configuration" rel="noreferrer">https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/README.md#advanced-configuration</a>.</p>
      </blockquote>
    </blockquote>
  </blockquote>
  
  <p>this is my package.json</p>
  
  <pre><code>"scripts": {
      "start": "react-scripts start",
      "build": "react-scripts build",
      "deploy": "serve -s build"
    }
  </code></pre>
  
  <p>this is my .env</p>
  
  <pre><code>##
  HOST=127.0.0.1
  PORT=8008
  ## PUBLIC_URL=http://myexamplesite.lk/
  ##
  
  REACT_APP_ROOT_BASE_URL=https://myexamplesite.lk/api/
  REACT_APP_ROOT_BASE_URL_META=http://myexamplesite.lk/
  </code></pre>