abstract fun onDelete(request: IncomingRequest, responseBuilder: OutgoingResponseBuilder): Single<OutgoingResponse>
Handler for request of DELETE
request - the incoming request. Examine its options to view query parameters and other metadata.
responseBuilder - the OutgoingResponseBuilder that should be used to construct a response.
Return
A Single that emits either an OutgoingResponse built with responseBuilder or an error. This response will be
delivered to the client.