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