Tiles URL starts with "https,http,http://..."

[stevage]

I'm getting a weird issue with a server hosted on Glitch where the tileJSON contains this:

"tiles":["https,http,http://demo-tessera.glitch.me/lgas/{z}/{x}/{y}.pbf"

Obviously that's not a usable tile endpoint, so Mapbox-GL-JS chokes on it.

I'm mystified why this is happening or what to do about it.

Any ideas?

[stevage]

Ok, so the issue seems to be that for some reason Glitch is setting the x-forwarded-proto header to this:

https,http,http

Whereas Tessera is assuming it will always be a single protocol. Annoyingly it doesn't seem to be a standard so there's no way to say who's right.