Custom URL Scheme, loading assets error

I’ve setup a custom URL scheme for android and iOS, so that stripe.js doesn’t throw any errors:

	"server": {
		"iosScheme": "ionic",
		"androidScheme": "ionic"
	}

This works fine and stripe.js now works fine. But now none of the ion-icons load and I get an error of:

HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME

Fetch API cannot load ionic://localhost/svg/alert-circle.svg. URL scheme “ionic” is not supported.

How do I go about allowing ionic:// to an allowed URL scheme?

Thanks,
Danny