Re: Updates to "optimistic upgrade"
Michael Sweet <msweet@msweet.org> Thu, 11 July 2024 20:16 UTC
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From: Michael Sweet <msweet@msweet.org>
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Date: Thu, 11 Jul 2024 16:14:58 -0400
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To: Ben Schwartz <bemasc@meta.com>
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Subject: Re: Updates to "optimistic upgrade"
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Ben,
> On Jul 11, 2024, at 11:02 AM, Ben Schwartz <bemasc@meta.com> wrote:
> ...
> #2818 - Deprecate the "HTTP" and "TLS" upgrade tokens
>
> From discussion on the list, it seems like we have consensus that "Upgrade: HTTP/2.0" is not a standards-compliant header field. This PR amends the IANA registry [2] to make that clearer. It also deprecates "Upgrade: TLS/1.2" and marks the corresponding RFC as Historic.
I've added the following comment to this PR:
Note that the Internet Printing Protocol (STD 92) REQUIRES support for TLS
upgrade when the printer supports TLS. Since TLS has been a standard features
of most network printers since 2012 (and was in most enterprise printers
prior to that), you can expect somewhere north of 2 billion network printers
support it...
I understand wanting to deprecate TLS upgrade for ordinary web browser
traffic where proxies are commonly used that don't know how to deal with the
Upgrade: header at all, but TLS upgrade *is* used for printing.
________________________
Michael Sweet
- Updates to "optimistic upgrade" Ben Schwartz
- Re: Updates to "optimistic upgrade" Michael Sweet
- Re: Updates to "optimistic upgrade" Ben Schwartz