Re: [hybi] [Technical Errata Reported] RFC7692 (4982)
Takeshi Yoshino <tyoshino@google.com> Tue, 28 March 2017 12:57 UTC
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From: Takeshi Yoshino <tyoshino@google.com>
Date: Tue, 28 Mar 2017 21:57:26 +0900
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Cc: Ben Campbell <ben@nostrum.com>, alissa@cooperw.in, aamelnikov@fastmail.fm, Salvatore Loreto <Salvatore.Loreto@ericsson.com>, Gabriel Montenegro <Gabriel.Montenegro@microsoft.com>, Moonchild <moonchild@palemoon.org>, "hybi@ietf.org" <hybi@ietf.org>
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Subject: Re: [hybi] [Technical Errata Reported] RFC7692 (4982)
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I discussed this with Mark a bit before Mark filed this. I hesitated to agree with the opinion initially because everyone can just choose to have their client support the parameter. But after the discussion I understood that lack of an explicit requirement asking clients to be prepared for a server_no_context_takeover in a handshake response would bother client implementors. The paragraph "A server MAY include the "server_no_context_takeover" extension ..." is a (MAY) requirement for servers. It's natural that client implementors don't look into it much. The spec shouldn't ask client implementors to infer what clients MUST do from the paragraph. In fact, a client that rejects a server_no_context_takeover in a handshake response is totally spec conformant as Mark said but it would encounter interop issues. Since it's uncommon that a server sends an unsolicited server_no_context_takeover, it can be after releasing their binary. That's worse. ---- For consistency with other paragraphs, we could also rewrite the paragraphs as follows. A server MAY ... response _as a hint_ even if ... A client MUST support the "server_no_context_takeover" extension parameter in an extension negotiation response regardless of whether or not the client may include the "server_no_context_takeover" extension parameter in an extension negotiation offer.
- [hybi] [Technical Errata Reported] RFC7692 (4982) RFC Errata System
- Re: [hybi] [Technical Errata Reported] RFC7692 (4… Takeshi Yoshino
- Re: [hybi] [Technical Errata Reported] RFC7692 (4… Takeshi Yoshino
- Re: [hybi] [Technical Errata Reported] RFC7692 (4… Takeshi Yoshino
- Re: [hybi] [Technical Errata Reported] RFC7692 (4… Moonchild
- Re: [hybi] [Technical Errata Reported] RFC7692 (4… Moonchild