> curl --data @- -X POST --dump - http://localhost:8529/_api/cursor
{ "query" : "FOR u IN unknowncollection LIMIT 2 RETURN u.n", "count" : true, "bindVars" : {}, "batchSize" : 2 }

HTTP/1.1 400 Bad Request
content-type: application/json

{
  "code": 400,
  "error": true,
  "errorMessage": "unable to open collection '%s': unable to open collection 'unknowncollection'",
  "errorNum": 1510
}