406Not Acceptable
The server cannot produce the response in any format your Accept headers said you would take.
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Usually an Accept header asking for something the endpoint cannot produce, such as requesting XML from an API that only speaks JSON. Most servers ignore the negotiation and send their default format instead, which is why 406 is uncommon.
The fix is nearly always to widen or remove the Accept header rather than to change the server. Some HTTP clients set a restrictive default that the person writing the request never chose, so it is worth checking what was actually sent.
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1xx Informational (4)
2xx Success (10)
3xx Redirection (8)
4xx Client errors (31)
5xx Server errors (16)