shell> curl -X POST --data-binary @- --dump - http://localhost:8529/_api/traversal
{"startVertex":"persons/alice","graphName":"knows_graph","direction":"any","uniqueness":{"vertices":"none","edges":"none"},"maxIterations":5}

HTTP/1.1 500 Internal Error
content-type: application/json; charset=utf-8

{ 
  "error" : true, 
  "code" : 500, 
  "errorNum" : 1909, 
  "errorMessage" : "too many iterations - try increasing the value of 'maxIterations'" 
}