title: How to enable and disable upgradeInsecureRequests csp directive using Helmet 4.4.1 version node.js module
body: <p>I have tried this using Helmet 4.4.1 version both of them below sets to true for upgrade-insecure-requests CSP</p>
  <pre><code>upgradeInsecureRequests: [] and upgradeInsecureRequests: ['true']
  </code></pre>
  <p>Which of the above format is correct to use?</p>