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RFC 6874, "Representing IPv6 Zone Identifiers in Address Literals and Uniform Resource Identifiers", February 2013

Source of RFC: 6man (int)

Errata ID: 3631
Status: Rejected
Type: Technical
Publication Format(s) : TEXT
Reported By: Michael Sweet
Date Reported: 2013-05-22
Rejected by: Brian Haberman
Date Rejected: 2013-05-23

Section 4 says: 

   An HTTP client, proxy, or other intermediary MUST remove any ZoneID
   attached to an outgoing URI, as it has only local significance at the
   sending host.

It should say:

   An HTTP client, proxy, or other intermediary MUST retain any ZoneID
   attached to an outgoing URI, as it will be the only way for an HTTP server
   to return a URI containing a link-local address that can subsequently be
   used by the HTTP client.

Notes:

The original advice ignores a very real issue: HTTP Servers that generate URIs from the client's Host: need to include the Client's zoneid in order for the link local address to be usable/routable.
--VERIFIER NOTES--
The zoneid is a strictly internal value that is not shared between devices.

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