status Registered
Verified 2026-09-18 · registry updated
2025-09-15HTTP 203 Non-Authoritative Information
The response metadata or representation came from a transforming intermediary.
Use 203 when a proxy has modified a successful response from its origin.
httpstatus codecacheproxy
Response (http)
HTTP/1.1 203 Non-Authoritative Information
Use 203 when a proxy has modified a successful response from its origin.
Common mistakes
- Caching a 203 response as though it were authoritative from the origin server.
Registry reference: RFC9110, Section 15.3.4