>>877
これが廃版となったRFC7231の該当箇所
↓
https://www.rfc-editor.org/rfc/rfc7231.html#section-6.5.3
6.5.3. 403 Forbidden
The 403 (Forbidden) status code indicates that the server understood the request but refuses to authorize it.
A server that wishes to make public why the request has been forbidden can describe that reason in the response payload (if any).

そしてこれが改訂されたRFC9110の該当箇所
↓
https://www.rfc-editor.org/rfc/rfc9110.html#section-15.5.4
15.5.4. 403 Forbidden
The 403 (Forbidden) status code indicates that the server understood the request but refuses to fulfill it.
A server that wishes to make public why the request has been forbidden can describe that reason in the response content (if any).

明らかに改訂されてるのにそれを認めたら敗北を認めることになってしまうイモタオサム無様すぎワロタ