The remote upload endpoint of skins does not work anymore.

Example URL:

https://www.minecraft.net/profile/skin/remote?url=https://laby.net/texture/image/4a3fe7ab9e36fbd013b4c7b97f7684f8.png

With this endpoint it was possible to directly apply remote skins from the web (e.g. skin databases). With the parameter model you could also specify, if it's a classic or a slim skin.

Is there a new endpoint or is it not supported anymore?
IMO it was a very convenient way to apply skins.