1 2 3 4 5 6 7 8  1 2 3 4 5 6 7 8  1 2 3 4 5 6 7 8  1 2 3 4 5 6 7 8
+----------------+----------------+----------------+----------------+
|     status     |      flags     |        server_msg_len           |
+----------------+----------------+----------------+----------------+
|           data_len              |        server_msg ...
+----------------+----------------+----------------+----------------+
|           data ...
+----------------+----------------+