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

curl -i -X POST 'http://localhost:3080/v2/version' -d '{"version": "2.2.0dev5"}'

POST /v2/version HTTP/1.1
{
    "version": "2.2.0dev5"
}


HTTP/1.1 200
Connection: close
Content-Length: 30
Content-Type: application/json
Date: Tue, 27 Nov 2018 15:10:09 GMT
Server: Python/3.6 GNS3/2.2.0dev5
X-Route: /v2/version

{
    "version": "2.2.0dev5"
}