example in docs about adding a wms layer not working

doc/mapbox-layers.md

the sample code works but maybe the source https is inaccessible. It works with another source.
Mapbox own example source works:
'https://img.nj.gov/imagerywms/Natural2015?bbox={bbox-epsg-3857}&format=image/png&service=WMS&version=1.1.1&request=GetMap&srs=EPSG:3857&transparent=true&width=256&height=256&layers=Natural2015'