Hypertext Transfer Protocol (HTTP) Warn Codes

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]