# 使用舊的 403 身分驗證錯誤狀態碼 { #use-old-403-authentication-error-status-codes }

在 FastAPI 版本 `0.122.0` 之前，當內建的安全工具在身分驗證失敗後回傳錯誤給用戶端時，會使用 HTTP 狀態碼 `403 Forbidden`。

從 FastAPI 版本 `0.122.0` 起，改為使用更合適的 HTTP 狀態碼 `401 Unauthorized`，並在回應中依據 HTTP 規範加上合理的 `WWW-Authenticate` 標頭，參考 [RFC 7235](https://datatracker.ietf.org/doc/html/rfc7235#section-3.1)、[RFC 9110](https://datatracker.ietf.org/doc/html/rfc9110#name-401-unauthorized)。

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