title: Request header field … is not allowed by Access-Control-Allow-Headers in preflight response
body: <p>I use react/express with django as backend.<br>
  I am trying to integrate s3 fine uploader and i am getting this issue :Request header field Cache-Control is not allowed by Access-Control-Allow-Headers in preflight response when trying to get signature from django,in a post request.<br>
  Normally i make all my request in code using fetch but here i make use of the package <a href="https://github.com/FineUploader/react-fine-uploader" rel="nofollow noreferrer">https://github.com/FineUploader/react-fine-uploader</a> and it make use of xhr ? any one ran into this issue</p>
  
  <p><strong>Synopsis</strong></p>
  
  <p>ERROR: Request header field Cache-Control is not allowed by Access-Control-Allow-Headers in preflight response.</p>
  
  <p>Frontend:React/express/webpack<br>
  Backend:Dajngo<br>
  Environment:Local (django server,react local api)<br>
  cause: xhr?</p>