POST /v1.0/1234/instances/23a3d4fb-3731-497b-afd4-bf25bde2b5fc/action HTTP/1.1
User-Agent: python-example-client
Host: ord.databases.api.rackspacecloud.com
X-Auth-Token: 2eeb3252-0164-40f5-8fb7-85df5faa2698
Accept: application/json
Content-Type: application/json

{
    "resize": {
        "flavorRef": "https://ord.databases.api.rackspacecloud.com/v1.0/1234/flavors/2"
    }
}