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RFC 7540, "Hypertext Transfer Protocol Version 2 (HTTP/2)", May 2015

Source of RFC: httpbis (app)

Errata ID: 4666
Status: Held for Document Update
Type: Technical

Reported By: Vasiliy Faronov
Date Reported: 2016-04-13
Held for Document Update by: Alexey Melnikov
Date Held: 2017-02-23

Section 9.1.2 says:

   A 421 response is cacheable by default, i.e., unless otherwise
   indicated by the method definition or explicit cache controls (see
   Section 4.2.2 of [RFC7234]).

It should say:

   [paragraph removed]

Notes:

The HTTP cache key (RFC 7234 Section 2) is based on the request URI, not on properties of the connection. Therefore, if a client were to cache a 421 response, it would then use this cached 421 to satisfy further requests to the same URI, before it has a chance to connect to an authoritative server.

Mark Nottingham: As discussed on list, I think the best we can do here is to note that in many cases, it'd be desireable to mark this as explicitly uncacheable.

With this paragraph removed, a 421 response is not cacheable by default, per RFC 7231 Section 6.1.

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