Success; the client should reset the document view (for example clear the form) that sent the request.
205 Reset Content asks the user agent to reset the view that triggered the request, such as clearing a data-entry form so the user can enter the next record. Like 204 it has no body. Browsers implement it inconsistently, so it is rarely used on the web.
HTTP/1.1 205 Reset Content
Content-Length: 0