I replied to your email, but replying here in case anyone comes across it.
All of our files are hosted on HTTPS. Depending on the request a browser may outright block the request for security reasons. I suggest configuring HTTPS on your server. There are a few (free) ways to do this:
- To manually set up HTTPS you can use https://letsencrypt.org/
- You can use Cloudflare's free plan: https://www.cloudflare.com/