Invoked when we get part of body for the request.
Invoked when we finish receiving the body.
Request failed. Maybe because of read/write error on socket or client not being able to send request in time.
Invoked when we have successfully fetched headers from client. This will always be the first callback invoked on your handler.
deprecated("Incorrect spelling. Using onRequest instead.")
Invoked when request processing has been completed and nothing more needs to be done. This may be a good place to log some stats and clean up resources. This is distinct from onEOM() because it is invoked after the response is fully sent. Once this callback has been received, downstream_ should be considered invalid.