curl -i -X POST 'http://localhost:3080/v2/shutdown' -d '{}'

POST /v2/shutdown HTTP/1.1
{}


HTTP/1.1 201
Connection: close
Content-Length: 0
Content-Type: application/octet-stream
Date: Sat, 30 Mar 2019 08:50:08 GMT
Server: Python/3.6 GNS3/2.2.0dev8
X-Route: /v2/shutdown