查询所有HTTP状态码含义，按类别分组，中英文对照。
HTTP status codes are three-digit numbers returned by web servers to indicate the outcome of a client's request. They are grouped into five classes based on the first digit.
1xx Informational — The request was received and is being processed. 2xx Success — The request was successfully received, understood, and accepted. 3xx Redirection — Further action is needed to complete the request. 4xx Client Error — The request contains bad syntax or cannot be fulfilled. 5xx Server Error — The server failed to fulfill a valid request.