> curl --data @- -X PUT --dump - http://localhost:8529/document/73482/30443310?rev=30443309
{ "World" : "Hallo" }

HTTP/1.1 412 Precondition Failed
content-type: application/json; charset=utf-8

{
  "_rev": 30443310,
  "_id": "73482/30443310",
  "error": true
}