unix> curl -X POST --data @- --dump - http://localhost:8529/_api/document?collection=products
{ "Hello": "World" }

HTTP/1.1 201 Created
content-type: application/json; charset=utf-8
etag: "13251162"
location: /_api/document/products/13251162

{ 
  "error" : false, 
  "_id" : "products/13251162", 
  "_rev" : "13251162", 
  "_key" : "13251162" 
}