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

curl -i -X POST 'http://localhost:3080/v2/version' -d '{"version": "2.1.8dev1"}'

POST /v2/version HTTP/1.1
{
    "version": "2.1.8dev1"
}


HTTP/1.1 200
Connection: close
Content-Length: 30
Content-Type: application/json
Date: Thu, 14 Jun 2018 08:35:21 GMT
Server: Python/3.5 GNS3/2.1.8dev1
X-Route: /v2/version

{
    "version": "2.1.8dev1"
}