POST /v1.0/1234/instances/13d940c4-70bb-4ff4-8866-6ee9ab5e5cae/action HTTP/1.1
User-Agent: python-example-client
Host: openstack.example.com
X-Auth-Token: 87c6033c-9ff6-405f-943e-2deb73f278b7
Accept: application/json
Content-Type: application/json