Status codes communicate success, redirection, client errors, and server errors.
Categories
- 1xx (Informational): Request received, continuing process.
- 2xx (Success): Request successfully received and processed (200 OK, 201 Created).
- 3xx (Redirection): Further action needed (301 Moved, 302 Found, 304 Not Modified).
- 4xx (Client Error): Bad request from client (400 Bad Request, 401 Unauthorized, 404 Not Found).
- 5xx (Server Error): Server failed to fulfill request (500 Internal Error, 502 Bad Gateway, 503 Unavailable).
Security relevance
- 401/403 indicate authentication/authorization issues.
- 404 can expose information about application structure.
- Excessive 5xx may indicate DoS or misconfigurations.
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