205
2xx SuccessReset Content
Tells the client to reset the document that sent the request.
205 Reset Content says the request succeeded and the client should reset the view that sent it, like clearing a form so the user can enter the next record. It's a 204 with one extra instruction attached, and like 204 the response carries no body. Almost no framework emits it by default, so sightings in the wild are rare.
What 205 looks like on the wire
POST /surveys/nps HTTP/1.1 Host: example.com Content-Type: application/x-www-form-urlencoded score=9 HTTP/1.1 205 Reset Content
About 2xx Success
The request was received, understood, and accepted. This is what you want to see.
Where it's defined
205 Reset Content is defined in RFC 9110 §15.3.6. MDN's 205 reference covers browser behavior and examples.