Fetch dosen't work only mobile platform in hosted test

yes, $ is jQuery.

  1. result is ‘Assessment failed: Unable to connect to the server’.
    maybe it was my backend was only use https port 80. (dose it have problem?)
  2. I changed err.message and JSON.stringify(err).
    err.message returned “Failed to fetch”, and JSON.stringify(err) returend {}.
    I dont know why it returned {}.
  3. I already tested it with my phone. it worked well. i tested url in “https://client-id.ext-twitch.tv/client-id/version/MD5/mobile.html” and only html file.

Thank you so much for your care!