I don’t know, if i try to do your request I get the following:
HTTP/1.1 403 Forbidden
Server: nginx
Date: Sat, 03 Jun 2017 11:11:27 GMT
Content-Type: application/json; charset=utf-8
Transfer-Encoding: chunked
Connection: close
Vary: Accept-Encoding
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
X-Request-Id: 611020b5-db42-4f3f-b38d-a55070e90c59
X-Runtime: 0.018272
{"errors":["Non hai il permesso di vedere la risorsa richiesta."],"error_type":"invalid_access"}
Which would prove I’m actually reaching the API. You might want to watch the logs while you are doing the request.