The KML URL is irrelevant. I want to change the URL for the KML service that converts the KML into features. When you create a KML layer, the KML URL is passed to the service, which then downloads and parses the KML, converts it into features, and returns a JSON string to the client. By default, it uses the ESRI service at http://utility.arcgis.com/sharing/kml, but I want to know if it's possible to change that and have it use our own. The motivation is that (in theory), our service would be able to handle URLs on our internal servers that the ESRI service cannot access.