status Unused
Verified 2026-09-18 · registry updated 2025-09-15

HTTP 418 (Unused)

The historic "I'm a teapot" response is reserved and is not used in current HTTP semantics.

Do not generate 418 for application errors; the current HTTP registry marks it unused, despite its historic teapot origin.

httpstatus codereservedunusedteapot

Response (http)

HTTP/1.1 418 (Unused)

The current HTTP registry marks 418 (Unused) as unused. Do not generate it for a normal application response.

Common mistakes

  • Sending 418 as a normal application response.

Registry reference: RFC 9110 §15.5.19

Sources

Permalink: https://merginit.com/reference/http/status-418