send by client or server after a :protobuf:msg:`Mysqlx.Session::AuthenticateStart` to exchange more auth data :param auth_data: authentication data :Returns: :protobuf:msg:`Mysqlx.Session::AuthenticateContinue`.

sent by the server after successful authentication :param auth_data: authentication data.

the initial message send from the client to the server to start the authentication proccess :param mech_name: authentication mechanism name :param auth_data: authentication data :param initial_response: initial response :Returns: :protobuf:msg:`Mysqlx.Session::AuthenticateContinue`.

close the current session :Returns: :protobuf:msg:`Mysqlx::Ok`.

reset the current session :Returns: :protobuf:msg:`Mysqlx::Ok`.