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If a client sends an Accept header of application/xml, should the body of any error message (e.g. 500) also be xml? Or does the Accept header only apply to 200-level responses?

jaco0646
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These sources imply that Content Negotiation should apply to error messages.

API Error Codes – The payload format can change according to what MIME types your API uses: you might reply with a JSON payload including your specific error code and an optional error message, or with an XML body with similar information.

Twitter – When the Twitter API returns error messages, it does so in your requested format.

jaco0646
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    Twitter has changed their API. It now states, "_Twitter API error messages are returned in JSON format._" – jaco0646 Nov 30 '19 at 17:11