use 421 Not Authoritative as status code (#442)

draft-ietf-httpbis-alt-svc.xml

@@ -462,33 +462,30 @@ User-Agent: Example/1.0
 </figure>
 </section>
 
-<section title="The 4NN Not Authoritative HTTP Status Code" anchor="status" >
+<section title="The 421 Not Authoritative HTTP Status Code" anchor="status">
 <t>
-   The 4NN (Not Authoritative) status code indicates that the current origin
+   The 421 (Not Authoritative) status code indicates that the current origin
    server (usually, but not always an alternative service; see <xref target="alternative"/>) is
    not authoritative for the requested resource, in the sense of
    <xref target="HTTP-p1" x:rel="#establishing.authority" x:fmt=","/>.
 </t>
 <t>
-   Clients receiving 4NN (Not Authoritative) from an alternative service &MUST;
+   Clients receiving 421 (Not Authoritative) from an alternative service &MUST;
    remove the corresponding entry from its alternative service cache (see
    <xref target="caching"/>) for that origin. Regardless of the idempotency of the request
    method, they &MAY; retry the request, either at another alternative server, or at
    the origin.
 </t>
 <t>
-   4NN (Not Authoritative) &MAY; carry an Alt-Svc header field.
+   421 (Not Authoritative) &MAY; carry an Alt-Svc header field.
 </t>
 <t>
    This status code &MUST-NOT; be generated by proxies.
 </t>
 <t>
-   A 4NN response is cacheable by default; i.e., unless otherwise indicated by the
+   A 421 response is cacheable by default; i.e., unless otherwise indicated by the
    method definition or explicit cache controls (see <xref target="HTTP-p6" x:rel="#heuristic.freshness" x:fmt="of"/>).
 </t>
-<t>
-  <cref anchor="code">We should decide on the status code before Last Call.</cref>
-</t>
 </section>
 
 <section title="IANA Considerations" anchor="iana-considerations" >
@@ -527,16 +524,17 @@ User-Agent: Example/1.0
 </t>
 </section>
 
-<section title="The 4NN Not Authoritative HTTP Status Code" anchor="the-4nn-not-authoritative-http-status-code" >
+<section title="The 421 Not Authoritative HTTP Status Code" anchor="status.code.registration">
 <t>
-   This document registers the 4NN (Not Authoritative) HTTP Status code
+   This document registers the 421 (Not Authoritative) HTTP Status code
+   in the Hypertext Transfer Protocol (HTTP) Status Code Registry
    (<xref target="HTTP-p2" x:fmt="," x:rel="#status.code.registry"/>).
 </t>
 <t>
-  <list style="symbols">
-    <t>Status Code: 4NN</t>
+  <list style="empty">
+    <t>Status Code: 421</t>
     <t>Short Description: Not Authoritative</t>
-    <t>Specification: [this document], <xref target="status"/></t>
+    <t>Specification: <xref target="status"/> of this document</t>
   </list>
 </t>
 </section>
@@ -822,7 +820,7 @@ User-Agent: Example/1.0
 
 <section title="Since draft-ietf-httpbis-alt-svc-00" anchor="changes.since.draft-ietf-httpbis-alt-svc-00">
 <t>
-  None yet.
+  Selected 421 as proposed status code for "Not Authoritative".
 </t>
 </section>