Invalid API version endpoint
According to SOL 013 (https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/013/02.06.01_60/gs_nfv-sol013v020601p.pdf) the endpoint should have an underscore, not a hyphen:
/api-versions should /api_version
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According to SOL 013 (https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/013/02.06.01_60/gs_nfv-sol013v020601p.pdf) the endpoint should have an underscore, not a hyphen:
/api-versions should /api_version