204
2xx SuccessNo Content
The request succeeded but there is no content to send back.
204 No Content means the request worked but there's deliberately nothing in the body. It's common after a successful DELETE, or for a PUT that doesn't need to echo data back. Clients should not expect a body and shouldn't try to parse one.
What 204 looks like on the wire
DELETE /api/sessions/current HTTP/1.1 Host: api.example.com HTTP/1.1 204 No Content
About 2xx Success
The request was received, understood, and accepted. This is what you want to see.
Where it's defined
204 No Content is defined in RFC 9110 §15.3.5. MDN's 204 reference covers browser behavior and examples.