The application I have to test the choice has been made for DELETE requests to also add a BODY / payload. It has been noted in the spec file that this might be a problem for 3rd party clients. Indeed,...
Ok, I guess that the update reminder I have is a gentle urge to pass PRO. Can't do that for now, so no BODY / Payload in the DELETE request for me. Thank you both for pointing me into the right directions.