HTTP Status Code Explorer
API & BackendSearch every HTTP status code with meaning, cause and how to respond.
Runs entirely in your browser — nothing is uploaded
Features
- Every registered status code from 1xx to 5xx.
- Search by number, name or symptom.
- Each entry explains the typical cause and the right client response.
- Filter by class to browse a whole family.
How to use the HTTP Status Code Explorer
- 1Search for a code, or filter by class.
- 2Open an entry to read its meaning and common causes.
- 3Follow the guidance on whether the request is safe to retry.
Frequently asked questions
401 or 403?
401 means you are not authenticated — credentials are missing or invalid. 403 means you are authenticated but not allowed to do this.
When should a client retry?
On 429 and 503, honouring Retry-After. On 500 and 502 a bounded retry with backoff is reasonable. Never retry a 4xx that reflects a client mistake.