curl -i -X POST 'http://localhost:8000/projects/{project_id}/iou/vms/{vm_id}/adapters/{adapter_number:\d+}/ports/{port_number:\d+}/start_capture' -d '{"capture_file_name": "test.pcap", "data_link_type": "DLT_EN10MB"}'

POST /projects/{project_id}/iou/vms/{vm_id}/adapters/{adapter_number:\d+}/ports/{port_number:\d+}/start_capture HTTP/1.1
{
    "capture_file_name": "test.pcap",
    "data_link_type": "DLT_EN10MB"
}


HTTP/1.1 200
CONNECTION: keep-alive
CONTENT-LENGTH: 158
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}/iou/vms/{vm_id}/adapters/{adapter_number:\d+}/ports/{port_number:\d+}/start_capture

{
    "pcap_file_path": "/var/folders/3s/r2wbv07n7wg4vrsn874lmxxh0000gn/T/tmpina5gsqc/a1e920ca-338a-4e9f-b363-aa607b09dd80/project-files/captures/test.pcap"
}