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

curl -i -X POST 'http://localhost:3080/v2/version' -d '{"version": "2.2.0dev8"}'

POST /v2/version HTTP/1.1
{
    "version": "2.2.0dev8"
}


HTTP/1.1 200
Connection: close
Content-Length: 30
Content-Type: application/json
Date: Sat, 30 Mar 2019 08:50:16 GMT
Server: Python/3.6 GNS3/2.2.0dev8
X-Route: /v2/version

{
    "version": "2.2.0dev8"
}