title Nickserver Request-Response-Sequence

Client-->Server: Request
Server->*Responder: new
Server->*Dispatcher: new(responder)
Server->Dispatcher: respond_to(params, headers)
# Dispatcher->*Request: new(params, headers)
Dispatcher->*HandlerA: call(request)
# HandlerA->Request: params
# Request->HandlerA: address: 'mail@domain'
note right of HandlerA: not responsible
HandlerA-->Dispatcher: nil
destroy HandlerA
Dispatcher->*HandlerB: call(request)
note right of HandlerB: responsible\nquery source and build response
HandlerB-->Dispatcher: reponse
destroy HandlerB
Dispatcher->Responder: send_response(response)
# destroy Request
destroy Dispatcher
Responder-->Client: Response
destroy Responder