In a federated query on my own (Fuseki) endpoint, which reaches out to the Wikidata endpoint, with values already bound, it seems that I get for each bound value an entry in the Fuseki log like this:

[2017-04-24 19:43:33] ResponseProcessCookies WARN  Invalid cookie header: "Set-Cookie: WMF-Last-Access=24-Apr-2017;Path=/;HttpOnly;secure;Expires=Fri, 26 May 2017 12:00:00 GMT". Invalid 'expires' attribute: Fri, 26 May 2017 12:00:00 GMT

[2017-04-24 19:43:33] ResponseProcessCookies WARN  Invalid cookie header: "Set-Cookie: WMF-Last-Access-Global=24-Apr-2017;Path=/;Domain=.wikidata.org;HttpOnly;secure;Expires=Fri, 26 May 2017 12:00:00 GMT". Invalid 'expires' attribute: Fri, 26 May 2017 12:00:00 GMT

The (simplified) query was:

PREFIX wdt: <http://www.wikidata.org/prop/direct/>

select *

where {

  bind("118578537" as ?gndId)

  service <https://query.wikidata.org/bigdata/namespace/wdq/sparql> {

    ?wd wdt:P227 ?gndId .

  }

}

I suppose this header was generated by the Wikidata endpoint – and could be fixed?

Cheers, Joachim