Sim, isso está correto. O servidor pode apenas dizer "Não aceito sua solicitação de manutenção e só fecho a conexão quando terminar".
HTTP/1.1 defines the "close" connection option for the sender to
signal that the connection will be closed after completion of the
response. For example,Connection: close
in either the request or the response header fields indicates that the connection SHOULD NOT be considered 'persistent' (section 8.1)
after the current request/response is complete.HTTP/1.1 applications that do not support persistent connections MUST include the "close" connection option in every message.