完整的HTTP状态码参考手册
HTTP status codes are three-digit numbers returned by web servers to indicate the result of a request. They range from 1xx (informational) to 5xx (server errors).
The tool covers all standard HTTP/1.1 and HTTP/2 status codes, including common ones (200, 301, 404, 500) and less common ones (103, 418, 511).
418 is an April Fools' joke from RFC 2324 (Hyper Text Coffee Pot Control Protocol). While defined in the spec, it's not used in production.