The API sometimes needs to check what links really mean, like file:72. As of now, we'll assume you don't use file or page numbers, so the Link-Controller must basically just return the original values.

1. Implement your LinkController based on the Oqtane example
2. To verify it works, you should open an edit-ui having image/link fields, and type a link. The UI should be making backend calls and getting the same data back as it sent, and not have errors.