> curl --data @- -X PUT
>      --dump - http://localhost:8529/collection/9496015:13658604?_rev=1234567
{}

HTTP/1.1 409 Conflict
content-type: application/json
connection: Keep-Alive
server: triagens GmbH High-Performance HTTP Server

{ "error" : true, 
  "message" : "document /collection/9496015/13658604 is been altered",
  "code" : 409 }