Is application/json content-type by default when NotFoundException?

[ppatierno]

Hello,
in my Quarkus RESTeasy Reactive based application, I noticed that when raising a NotFoundException, the client receives the 404 error correctly with empty body and content-type application/json. Is this content type by default? Is it possible to change/remove it? Is using an exception mapper the way? (to catch the "not found" and building a response with no or different content type).
Thanks.