shell> curl --header 'x-arango-async: store' --dump - http://localhost:8529/_admin/sleep?duration=30

HTTP/1.1 202 Accepted
content-type: text/plain; charset=utf-8
x-arango-async-id: 147747578002087

shell> curl --dump - http://localhost:8529/_api/job/147747578002087

HTTP/1.1 204 No Content
content-type: text/plain; charset=utf-8