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HTTP 405 Method Not Allowed

The URL exists but does not support this HTTP method.

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

In AI APIs specifically

Typically a GET against a POST-only inference endpoint, often caused by a redirect that downgraded the method.

Fix checklist

  • Use the method documented for the endpoint.
  • Check for redirects converting POST to GET.

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..

← All HTTP status codes