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

curl -i -X PUT 'http://localhost:8000/projects/{project_id}' -d '{"path": "/private/var/folders/3s/r2wbv07n7wg4vrsn874lmxxh0000gn/T/pytest-2262/test_update_path_project_non_l0"}'

PUT /projects/{project_id} HTTP/1.1
{
    "path": "/private/var/folders/3s/r2wbv07n7wg4vrsn874lmxxh0000gn/T/pytest-2262/test_update_path_project_non_l0"
}


HTTP/1.1 403
CONNECTION: keep-alive
CONTENT-LENGTH: 100
CONTENT-TYPE: application/json
DATE: Thu, 08 Jan 2015 16:09:15 GMT
SERVER: Python/3.4 GNS3/1.3.dev1
X-ROUTE: /v1/projects/{project_id}

{
    "message": "You are not allowed to modify the project directory location",
    "status": 403
}