Original text:
Argument syntax: <del> The "no-cache" response directive indicates that the response MUST NOT be used to satisfy any other request without forwarding it for validation and receiving a successful response; see validation.model. This allows an origin server to prevent a cache from using it to satisfy a request without contacting it, even by caches that have been configured to send stale responses. If the no-cache response directive specifies one or more field names, then a cache MAY use the response to satisfy a subsequent request, subject to any other restrictions on caching.  However, any header fields in the response that have the field name(s) listed MUST NOT be sent in the response to a subsequent request without successful revalidation with the origin server.  This allows an origin server to prevent the re-use of certain header fields in a response, while still allowing caching of the rest of the response. </del>  The field names given are not limited to the set of header fields defined by this specification.  Field names are case-insensitive.

Reviewer comments:
This is related to issue On the flight back from Switzerland, I spent time looking at the cache directives and how they differ from the descriptions in RFC2616. I worked out these problems and drafted a pull request, but I haven't checked whether we changed these deliberately for RFC7234, or if the distinctions just got lost in the rewrite. In any case, I think this is an improvement, but definitely needs reviews.
This ended up being an editorial change between drafts because the only normative changes were already noted for and , and this is just rewording what we had for .
From : Both state that a (depending on context private, shared or both types of) "cache MAY store the response and reuse it for later requests, even if the response would normally be non-cacheable". To my understanding, this does not intend to override the requirements from the "Storing Responses in Caches" section (URL) altogether. Instead, I would assume that it only refers to the condition "has a status code that is defined as heuristically cacheable" in that section (or, as it was stated in RFC7234, "has a status code that is defined as cacheable by default")? Would it make sense to amend the list of conditions in that section, appending to the "the response either..." second-level list: "contains a private response directive if the cache is not shared"?
OP here
lists some directives that allow responses with Authentication to be stored, but some of those directives' definitions do not mention this.
I think this should also be added for ; see .
I think this issue needs to be reopened and the specification text reverted to something more like what was in RFC2616. That spec specifically requires public be present to allow responses to a request with Authorization to be stored by a shared cache, regardless of must-revalidate or proxy-revalidate. This is not implied by those other directives.

Revised text:
Argument syntax:  <ins> The "no-cache" response directive, in its unqualified form (without an argument), indicates that the response MUST NOT be used to satisfy any other request without forwarding it for validation and receiving a successful response; see validation.model. This allows an origin server to prevent a cache from using the response to satisfy a request without contacting it, even by caches that have been configured to send stale responses. The qualified form of no-cache response directive, with an argument that lists one or more field names, indicates that a cache MAY use the response to satisfy a subsequent request, subject to any other restrictions on caching, if the listed header fields are excluded from the subsequent response or the subsequent response has been successfully revalidated with the origin server (updating or removing those fields).  This allows an origin server to prevent the re-use of certain header fields in a response, while still allowing caching of the rest of the response. </ins> The field names given are not limited to the set of header fields defined by this specification.  Field names are case-insensitive.