nova/nova/tests/functional/api_sample_tests/api_samples/servers/v2.73/server-update-req.json.tpl

{
    "server": {
        "accessIPv4": "%(access_ip_v4)s",
        "accessIPv6": "%(access_ip_v6)s",
        "OS-DCF:diskConfig": "AUTO",
        "name": "new-server-test",
        "description": "Sample description"
    }
}