506Variant Also Negotiates
The server is misconfigured: a resource meant to pick between versions is pointing at itself.
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Only in servers using transparent content negotiation, where a configuration loop makes it impossible to settle on a version. It is a configuration error rather than anything a client did.
Nothing a visitor does will change it, and retrying will not help. The fix is in the server configuration, where a resource that is supposed to choose between variants has been listed as one of its own variants.
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1xx Informational (4)
2xx Success (10)
3xx Redirection (8)
4xx Client errors (31)
5xx Server errors (16)