In JSON-LD identifiers use the "https" scheme, for instance:

"@id":"https://musicbrainz.org/work/17ff494f-7698-33ab-b841-b1ce5e01423a"

The documentation (https://wiki.musicbrainz.org/MusicBrainz_Identifier under Uniform Resource Identifier) uses the "http" scheme instead:

http://musicbrainz.org/artist/0383dadf-2a4e-4d10-a46a-e9e041da8eb3

When entered into a browser both "work" thanks to redirects, but things start to fail in say SPARQL queries in Wikidata where the presence or absence of an "s" makes a difference.