Error API_KEY_HTTP_REFERRER_BLOCKED ocurred at using Youtube Data API v3

When making a request to:

https://www.googleapis.com/youtube/v3/search?part=snippet&type=video&maxResults=5&key=<MY_API_KEY>&q=dogs

I get the following error response:

"error": {"code": 403,"message": "Requests from referer \u003cempty\u003e are blocked.","errors": [      {"message": "Requests from referer \u003cempty\u003e are blocked.","domain": "global","reason": "forbidden"      }    ],"status": "PERMISSION_DENIED","details": [      {"@type": "type.googleapis.com/google.rpc.ErrorInfo","reason": "API_KEY_HTTP_REFERRER_BLOCKED","domain": "googleapis.com","metadata": {"consumer": "projects/119952101582","service": "youtube.googleapis.com"        }      }    ]  }}