> curl -X GET --dump - http://localhost:8529/_document/9496015:13658604
HTTP/1.1 200 OK
content-type: application/json
connection: Keep-Alive
server: triagens GmbH High-Performance HTTP Server
etag: "14755542"
content-length: 27

{,"_id":"9496015:13658604"}

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

HTTP/1.1 409 Conflict
content-type: application/json
connection: Keep-Alive
server: triagens GmbH High-Performance HTTP Server
content-length: 101

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