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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.
- schema.org 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 <https://schema.org/CreativeWork>. (https://schema.org/CreativeWork.ttl, Status 2019-02-01)
tbc