$ curl -Is "http://wikidata.org/wiki" | grep Location
Location: http://wikidata.org/wiki
Redirect loop.
Version: wmf-deployment
Severity: normal
URL: http://wikidata.org/wiki
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=41847
https://bugzilla.wikimedia.org/show_bug.cgi?id=45005