Location
- from: github.com/schloerke/leaflet-providers@urlProtocol 
- Inspiration taken from https://github.com/leaflet-extras/leaflet-providers/commit/dea786a3219f9cc824b8e96903a17f46ca9a5afc to use the ‘old’ relative url protocols and to ‘upgrade’ them at js runtime. 
Notes…
- Copy/paste provider information into providers.json
var providers = L.TileLayer.Provider.providers;
JSON.stringify(providers, null, "  ");- ./data-raw/providerNames.Rwas re-ran to update to the latest providers
- Some providers had their protocols turned into ‘//’. - This allows browsers to pick the protocol
- To stop files from the protocols staying as files, a ducktape patch was applied to L.TileLayer.prototype.initializeandL.TileLayer.WMS.prototype.initialize