Terminology Index
Glossary
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Status Code
A three-digit number in an HTTP response indicating outcome, 200 OK, 401 Unauthorized, 500 Internal Server Error, that defenders read to understand application behavior and detect abuse.
HTTP status codes are grouped by leading digit: 2xx success, 3xx redirection, 4xx client errors (including 401 unauthorized, 403 forbidden, 404 not found), 5xx server errors. For defenders, status codes are signals: spikes in 401s suggest credential abuse, lots of 404s can indicate scanning or forced browsing, 500s may reveal injection probing. Reading status codes in logs is a foundational defensive-web skill, paired with reading requests and responses.
Introduced in: Defensive Web Fundamentals
Examples
- Spikes in 401 responses signaling credential-stuffing attempts.
- Many 404s as a sign of scanning or forced browsing.
- Investigating 500-error patterns that may reveal injection probing.
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