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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) - 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)
[Update 2019-03-12:] German National Library (DNB) decided to switch all URIs in domain d- nb.info to https in October 2019
tbc