SoloDiff

HTTP Status Code Reference: Look Up HTTP Status Codes

Offline lookup of IANA-registered HTTP status codes. Search by number or phrase, filter the 1xx–5xx class, and copy the official reason phrase. RFC 9110 treats reason phrases as optional recommendations. Unrecognized codes are understood by class (a 471 is treated like 400). Unassigned, unused, temporary, and obsolete registrations are labeled instead of invented.

Class

Optional deep link: add #404 to this page URL. Nothing is stored in the browser.

1xx InformationalRequest received, continuing process
2xx SuccessReceived, understood, and accepted
3xx RedirectionFurther action needed to finish
4xx Client ErrorBad syntax or cannot be fulfilled
5xx Server ErrorServer failed a valid-looking request