def METHOD_NAME(self, address, port=853, source=None, source_port=0):
    connection = self._connections.get((address, port))
    if connection is not None:
        return (connection, False)
    qconn = aioquic.quic.connection.QuicConnection(configuration=self._conf)
    qconn.connect(address, time.time())
    connection = self._connection_factory(
        qconn, address, port, source, source_port, self
    )
    self._connections[(address, port)] = connection
    return (connection, True)