HTTP Status Codes

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What are HTTP status codes?

HTTP status codes are three-digit numbers returned by the server in every response — signaling success, redirection, client or server errors. The first digit categorizes: 1xx informational, 2xx success, 3xx redirect, 4xx client error, 5xx server error. RFC 9110 is the current specification. Common codes: 200 OK, 301 Permanent Redirect, 404 Not Found, 500 Internal Server Error.