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

HTTP 306 (Unused)

This status code is reserved and is not used in current HTTP semantics.

Do not generate 306; it is retained in the registry for historical compatibility.

httpstatus codereservedunused

Response (http)

HTTP/1.1 306 (Unused)

The current HTTP registry marks 306 (Unused) as unused. Do not generate it for a normal application response.

Common mistakes

  • Sending 306 as a normal application response.

Registry reference: RFC9110, Section 15.4.7

Sources

Permalink: https://merginit.com/reference/http/status-306