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

curl -i -X POST 'http://localhost:3080/v2/version' -d '{"version": "2.2.0dev2"}'

POST /v2/version HTTP/1.1
{
    "version": "2.2.0dev2"
}


HTTP/1.1 200
Connection: close
Content-Length: 30
Content-Type: application/json
Date: Thu, 16 Aug 2018 14:23:33 GMT
Server: Python/3.5 GNS3/2.2.0dev2
X-Route: /v2/version

{
    "version": "2.2.0dev2"
}