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Quick Summary: Every REST API error is an RFC 9457 problem+json body. Its type field is a URL that resolves to a page in this catalogue telling you what happened and what to do.
Every error response has Content-Type: application/problem+json and this shape:
Always log the requestId — it is the one string SkillsDB support can trace a request by. Some errors carry extra fields (extension members), documented on their pages.