unix> curl -X PUT --data @- --dump - http://localhost:8529/_api/document/products8/20722266
{}

HTTP/1.1 202 Accepted
content-type: application/json; charset=utf-8
etag: "21312090"
location: /_api/document/products8/20722266

{ 
  "error" : false, 
  "_id" : "products8/20722266", 
  "_rev" : "21312090", 
  "_key" : "20722266" 
}