What does HTTP status 203 (Non Auth Information) mean?

 
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HTTP_STATUS_ACCEPTED HTTP_STATUS_NO_CONTENT

HTTP_STATUS_NON_AUTH_INFORMATION

The request succeeded, but the representation was modified by a proxy between the client and origin. That distinction matters when a client later validates or reuses the representation through a different network path.

Investigate intermediary proxies, compression gateways, security products, or content filters when the payload differs from the origin response. Preserve the response headers when comparing results.

The response remains successful, but metadata was obtained from or modified by an intermediary rather than being identical to an origin 200 response. A cache or client that needs origin metadata should account for that distinction. The status is not an authentication warning despite the word “non-authoritative.”

RFC 9110: HTTP Semantics


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