Re: [DNSOP] DNS HTTPS/SVCB record type support in iOS 14

[David Schinazi <[e-mail]>]

Hi Tommy,

Thanks for the announcement! It's really exciting to see this deployed in
the wild.
Clarification question: your email mentioned support for the HTTPS DNS
query,
but it didn't mention when iOS makes those queries. For example, do you
query
this record every single time you perform A/AAAA queries? (in the context of
a Network.framework connection to port 443)

David

On Fri, Sep 25, 2020 at 12:59 PM Tommy Pauly <tpauly=
[e-mail]> wrote:

> Hello DNSOP & QUIC,
>
> I wanted to provide an update that the production version of iOS 14, which
> shipped last week, includes support for sending HTTPS (SVCB) DNS queries
> (RR type 65) for applications using our system networking APIs.
>
> The implementation status has been updated here:
> https://github.com/MikeBishop/dns-alt-svc/blob/master/svcb-implementations.md
>
> For those with HTTP/3 QUIC deployments, this means that (when HTTP/3
> experimental support is enabled) iOS will use the ALPN indication in the
> HTTPS record to enable HTTP/3 prior to receiving an Alt-Svc indication. As
> previously noted on the DNSOP list, Cloudflare is already supporting
> publishing these records, and we’d encourage other server deployments that
> support QUIC to do the same.
>
> To note, this behavior is the same in the betas of macOS 11.
>
> Best,
> Tommy
>