title: Ace Editor JSON format check not work in "localhost://"
body: <p>This is my code in "file://":</p>
  
  <p><img src="https://i.stack.imgur.com/neiO1.png" alt="my code image. click and see"> </p>
  
  <p>It works. But when I put it on the "127.0.0.1". </p>
  
  <p><img src="https://i.stack.imgur.com/t5MVj.png" alt="enter image description here"></p>
  
  <p>There was an error. GET <a href="http://localhost:8080/worker-json.js" rel="nofollow noreferrer">http://localhost:8080/worker-json.js</a> 404 (Not Found)</p>