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

HTTP/1.1 201 Created
content-type: application/json; charset=utf-8
etag: "1512122531"
location: /_db/_system/_api/document/products/1512122531

{ 
  "error" : false, 
  "_id" : "products/1512122531", 
  "_rev" : "1512122531", 
  "_key" : "1512122531" 
}