HTTP Status Codes

Search and browse all standard HTTP status codes across all classes (1xx–5xx). Each code includes its name, description, when to use it, common causes, and a link to the relevant RFC specification.

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Common Use Cases

Look up unfamiliar status codes from logs
Choose the right status code for API responses
Debug 4xx and 5xx errors
Learn HTTP semantics

Frequently Asked Questions

What is the difference between 401 and 403?

401 Unauthorized means the client is not authenticated — they need to log in. 403 Forbidden means the client is authenticated but not authorized — they are logged in but lack permission for the resource.

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