callback
{Function}
Stops the server from establishing new sessions. This does not prevent new
request streams from being created due to the persistent nature of HTTP/2
sessions. To gracefully shut down the server, call [http2session.close()
][] on
all active sessions.
If callback
is provided, it is not invoked until all active sessions have been
closed, although the server has already stopped allowing new sessions. See
[tls.Server.close()
][] for more details.