As you can see from the diff or the changelog (Appendix D), there have been quite a few changes between -02 and -03. However, these changes are almost exclusively advisory or editorial, improving implementation guidance or clarifying exposition. The only real "protocol change" between these versions is in the zone file syntax for ALPN IDs that contain commas. The new draft changes the escaping rules in order to reduce special casing and enable the first step of SvcParamValue parsing to proceed uniformly for all SvcParamKeys. (These escaping rules are currently, and perhaps forever, an academic question, since there are no defined ALPN IDs that contain commas.)
On Wed, Feb 17, 2021 at 10:58 AM <[email protected]> wrote: > > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > This draft is a work item of the Domain Name System Operations WG of the > IETF. > > Title : Service binding and parameter specification via > the DNS (DNS SVCB and HTTPS RRs) > Authors : Ben Schwartz > Mike Bishop > Erik Nygren > Filename : draft-ietf-dnsop-svcb-https-03.txt > Pages : 47 > Date : 2021-02-17 > > Abstract: > This document specifies the "SVCB" and "HTTPS" DNS resource record > (RR) types to facilitate the lookup of information needed to make > connections to network services, such as for HTTPS origins. SVCB > records allow a service to be provided from multiple alternative > endpoints, each with associated parameters (such as transport > protocol configuration and keys for encrypting the TLS ClientHello). > They also enable aliasing of apex domains, which is not possible with > CNAME. The HTTPS RR is a variation of SVCB for HTTPS and HTTP > origins. By providing more information to the client before it > attempts to establish a connection, these records offer potential > benefits to both performance and privacy. > > TO BE REMOVED: This document is being collaborated on in Github at: > https://github.com/MikeBishop/dns-alt-svc > (https://github.com/MikeBishop/dns-alt-svc). The most recent working > version of the document, open issues, etc. should all be available > there. The authors (gratefully) accept pull requests. > > > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-dnsop-svcb-https/ > > There is also an HTML version available at: > https://www.ietf.org/archive/id/draft-ietf-dnsop-svcb-https-03.html > > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=draft-ietf-dnsop-svcb-https-03 > > > Please note that it may take a couple of minutes from the time of > submission > until the htmlized version and diff are available at tools.ietf.org. > > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ > > > _______________________________________________ > DNSOP mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/dnsop >
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