Question
Which of the following is not a valid HTTP response status code category?
Solution
HTTP status codes are grouped as: 1xx (Informational), 2xx (Success — e.g., 200 OK), 3xx (Redirection — e.g., 301 Moved Permanently), 4xx (Client Error — e.g., 404 Not Found, 403 Forbidden), 5xx (Server Error — e.g., 500 Internal Server Error, 503 Service Unavailable). There is no 6xx category. Common banking context: 401 Unauthorized, 429 Too Many Requests (rate limiting for API security).
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