shell> curl -X POST --data-binary @- --dump - http://localhost:8529/_api/gharial/social/edge/relation
{ 
  "type" : "friend", 
  "_from" : "female/alice", 
  "_to" : "female/diana" 
}

HTTP/1.1 202 Accepted
content-type: application/json
etag: 1492854947

{ 
  "error" : false, 
  "code" : 202, 
  "edge" : { 
    "_id" : "relation/1492854947", 
    "_rev" : "1492854947", 
    "_key" : "1492854947" 
  } 
}