I also opened the same issue at the positron style https://github.com/openmaptiles/positron-gl-style/issues/19
The current sprites are referenced by url. Here is a to the [reference line]( "sprite": "https://openmaptiles.github.io/maptiler-toner-gl-style/sprite",)
If a newbie downloads the json, puts it into its tileserver-gl and there is no internet connection he receives 500er errors.
Please provide the sprites as a local path OR alter the readme with a section regarding foreign urls.
I also opened the same issue at the positron style https://github.com/openmaptiles/positron-gl-style/issues/19 The current sprites are referenced by url. Here is a to the [reference line]( "sprite": "https://openmaptiles.github.io/maptiler-toner-gl-style/sprite",) If a newbie downloads the json, puts it into its tileserver-gl and there is no internet connection he receives 500er errors. Please provide the sprites as a local path OR alter the readme with a section regarding foreign urls.
See https://tileserver.readthedocs.io/en/latest/config.html#sprites for more information on how sprites are accessed by tileserver-gl.
I also opened an issue on tileserver-gl to provide better error logs for inaccessible network files https://github.com/maptiler/tileserver-gl/issues/557