I-D Action: draft-martin-retry-over-ipv6-04.txt

Internet-Draft draft-martin-retry-over-ipv6-04.txt is now available.

   Title:   HTTP Signaling of Planned IPv4 Unavailability
   Author:  Franck Martin
   Name:    draft-martin-retry-over-ipv6-04.txt
   Pages:   35
   Dates:   2026-07-28

Abstract:

   As operators transition services to IPv6-only, planned IPv4 outages
   help identify remaining dependencies before permanent decommission.
   Such outages must be measurable, reversible, and understandable to
   end users.  This document defines HTTP signaling for an intentional,
   often time-bounded IPv4 outage: the existing 503 Service Unavailable
   status code together with the mandatory Retry-Over-IPv6 response
   header field (and optional related fields) that instruct aware
   clients to retry over IPv6 after closing the IPv4 connection, and
   allow clients to confirm successful IPv6 recovery via an optional
   correlation token so operators can distinguish soft failures from
   hard failures in centralized logs.  Machine-readable response bodies
   MAY use Problem Details (RFC 9457) with a registered problem type
   URI.  The mechanism supports staged enterprise rollouts, internal
   HTTP services, and permanent IPv6-only migration; coordinated public
   events (for example, 6/6 drills) remain possible with advance notice.
   The primary intended deployment is operator-controlled environments
   where provider and users share operational responsibility.  Legacy
   clients that do not implement this specification treat the response
   as ordinary service unavailability and MAY use the response body for
   human-readable guidance.

The IETF datatracker status page for this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-martin-retry-over-ipv6/

There is also an HTML version available at:
https://www.ietf.org/archive/id/draft-martin-retry-over-ipv6-04.html

A diff from the previous version is available at:
https://author-tools.ietf.org/iddiff?url2=draft-martin-retry-over-ipv6-04

Internet-Drafts are also available by rsync at:
rsync.ietf.org::internet-drafts


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