[Wikidata] Problem with federated SPARQL query via Blazegraph

Hi all,

I've found a 403 forbidden response with a SPARQL federated query. I simply tested:

SELECT * WHERE { service https://query.wikidata.org/sparql { ?s ?p ?o } } LIMIT 10

Using a Virtuoso endpoint like: https://contrattipubblici.org/sparql it works fine!

But using a local Blazegraph instance it returns:

java.util.concurrent.ExecutionException: java.util.concurrent.ExecutionException: org.openrdf.query.QueryEvaluationException: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.Exception: task=ChunkTask{query=82b3f021-a8d3-447b-9aff-d4f10f72b80d, bopId=1,partitionId=-1,sinkId=2,altSinkId=null}, cause=java.util.concurrent.ExecutionException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: com.bigdata.rdf.sail.webapp.client.HttpException: Status Code=403, Status Line=Forbidden, Response= 403 Forbidden 403 Forbidden nginx/1.11.6

Knowing that the Wikidata SPARQL service is built upon Blazegraph, could it be a conflicting configuration of your nginx? Or do you have any other suggestion?

Thanks,

Alessio