gns3-server/docs/api/examples/hypervisor_post_qemuimg.txt

curl -i -X POST 'http://localhost:8000/v2/qemu/img' -d '{"cluster_size": 64, "format": "qcow2", "lazy_refcounts": "off", "path": "/tmp/hda.qcow2", "preallocation": "metadata", "qemu_img": "/tmp/qemu-img", "refcount_bits": 12, "size": 100}'

POST /v2/qemu/img HTTP/1.1
{
    "cluster_size": 64,
    "format": "qcow2",
    "lazy_refcounts": "off",
    "path": "/tmp/hda.qcow2",
    "preallocation": "metadata",
    "qemu_img": "/tmp/qemu-img",
    "refcount_bits": 12,
    "size": 100
}


HTTP/1.1 201
ACCESS-CONTROL-ALLOW-ORIGIN: *
CONTENT-LENGTH: 0
DATE: Thu, 08 Jan 2015 16:09:15 GMT
SERVER: Python/3.5 GNS3/1.5.0dev1
X-ROUTE: /v2/hypervisor/qemu/img