> curl --data @- -X POST --dump - http://localhost:8529/_api/graph/graph1/edge
{"_key" : "edge1", "_from" : "vert2", "_to" : "vert1", "optional1" : "val1"}

HTTP/1.1 201 Created
content-type: application/json; charset=utf-8

{
  "edge": {
    "_id": "e/edge1",
    "_rev": "57595366",
    "_key": "edge1",
    "_from": "v/vert2",
    "_to": "v/vert1",
    "$label": null,
    "optional1": "val1"
  },
  "error": false,
  "code": 201
}