'Override to handle a new `.IOStream` from an incoming connection.
This method may be a coroutine; if so any exceptions it raises
asynchronously will be logged. Accepting of incoming connections
will not be blocked by this coroutine.
If this `TCPServer` is configured for SSL, ``handle_stream``
may be called before the SSL handshake has completed. Use
`.SSLIOStream.wait_for_handshake` if you need to verify the client\'s
certificate or use NPN/ALPN.
.. versionchanged:: 4.2
Added the option for this method to be a coroutine.'

def handle_stream(self, stream, address):

    raise NotImplementedError()
