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  • Wikidata has a 301 redirect from http to https URIs in place but retains http URIs as "Concept URIs", i.e. in RDF data. 
  • vocabulary retains http in the URIs, has a 301 redirect from http to https URIs and a triple in the RDF data connecting the two with schema:sameAs, e.g. schema:CreativeWork schema:sameAs <> . (, Status 2019-02-01)
  • Library of Congress has so far decided not to switch URIs to HTTPS due to disruption but also lack of capacity to make a final decision. There are plans to review the decision and investigate further (Status February 2019)