URL Action by Parameter does not accept a full URL in the field

Using a URL Action with a field does not work if the full URL (including the protocol) is in a field instead of being only a partial value. Specifically you’ll receive the error:

Only http, https, and mailto url schemes are supported.

It’s not possible to always know what protocol will be used (it could be http, or https) so removing the prefix isn’t an option for me.

I can mark this as a feature request.