topic Registered
Verified 2026-09-19 · registry updated
2022-06-08HTTP registry: 199
Miscellaneous Warning
Warning values report cache or response conditions affecting representation interpretation. 199 is registered in HTTP Warn Codes. Defining reference: RFC7234, Section 5.5.5.
httpregistryhttp-warn-codeswarn-codes
Identifier (http)
199
Miscellaneous Warning
Prefer current HTTP semantics where the warning mechanism is obsolete and do not expose intermediary diagnostics as application truth.
This registry value is currently marked active by IANA. Follow the defining specification before sending, accepting, or proxying it.
IANA registry: http-warn-codes/warn-codes
Registry reference: RFC7234, Section 5.5.5