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

curl -i -X POST 'http://localhost:3080/v2/settings' -d '{"test": true}'

POST /v2/settings HTTP/1.1
{
    "test": true
}


HTTP/1.1 201
Content-Length: 20
Content-Type: application/json
Date: Tue, 27 Sep 2016 10:01:24 GMT
Server: Python/3.5 GNS3/2.0.0dev1
X-Route: /v2/settings

{
    "test": true
}