Internet Assigned Numbers Authority

Hypertext Transfer Protocol (HTTP) Warn Codes

Created
2014-02-17
Last Updated
2022-06-08
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Registry included below

HTTP Warn Codes

Registration Procedure(s)
IETF Review
Reference
[RFC7234]
Note
The Warning header field (and the warn codes that it uses) has been 
obsoleted for HTTP per [RFC9111].
    
Available Formats

CSV
Warn Code Short Description Reference
110 Response is Stale [RFC7234, Section 5.5.1]
111 Revalidation Failed [RFC7234, Section 5.5.2]
112 Disconnected Operation [RFC7234, Section 5.5.3]
113 Heuristic Expiration [RFC7234, Section 5.5.4]
199 Miscellaneous Warning [RFC7234, Section 5.5.5]
214 Transformation Applied [RFC7234, Section 5.5.6]
299 Miscellaneous Persistent Warning [RFC7234, Section 5.5.7]