Loading screen works in browser, but not ingame

[Marjk]

I have this loading screen:
https://107.180.27.180/~te4gc57pinc0/sleekLoad2slide/index.html

It works in my browser, but when I do
sv_loadingurl "107.180.27.180/~te4gc57pinc0/sleekLoad2slide/index.html"

It gives me a file not found error

[Kingof🅱east]

https

[Marjk]

When I try it with https it's just a grey screen

[6F5]

Insecure website.

[G😹nz😻]

Most likely expired certificate