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HTTP 451 Unavailable For Legal Reasons

Access denied for legal reasons — censorship, sanctions or court orders.

4xx · Client error✗ not retryable — fix the request instead

In AI APIs specifically

AI providers return 451-style geo blocks in unsupported regions; a VPN exit node in a sanctioned country triggers this too.

Fix checklist

  • Check the provider's supported-regions list.
  • Verify your egress IP isn't routing through an unsupported region.

Spec: RFC reference

Related status codes

400 Bad Request

The server cannot process the request due to a client error — malformed JSON, invalid parameters, or schema violations..

401 Unauthorized

Authentication is missing or invalid for this request..

402 Payment Required

The request requires payment — billing is not set up or a balance is exhausted..

403 Forbidden

The server understood the request but refuses to authorize it — valid credentials, insufficient permission..

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