2xx--成功
200 OK
201 Created
204 No-Content
3xx--轉址(去找別人)
4xx--客戶端錯誤
401 Unauthorized(Authentication)
403 Forbidden(Authorization)
404 Not-Found
5xx--伺服器端錯誤
500 Server爆掉
502 Bad-Gateway，DNS連不到reverse proxy、reverse proxy跟webserver斷掉
504 Timeout，通常是超過30秒
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