[dev-platform] Intent to Ship: HTTPS RR

[Kershaw Chang]

Summary:

HTTPS RR is a new DNS resource record (RR) type. It's basically a set of key-value pairs that contains information about how to establish a HTTP connection. For example, an HTTPS RR below indicates that the service provided by “example.com” is also provided by “example.net” using HTTP/2 and port 1234.

<example.com 3600 IN HTTPS 1 example.net alpn=”h2” port=”1234”>

We are going to ship two features of HTTPS RR:

1. Perform HTTPS upgrade when HTTPS RR is available.

2. Using HTTPS RR as Alt-Svc headers.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1634793

Standard: https://datatracker.ietf.org/doc/html/draft-ietf-dnsop-svcb-https-07

Platform coverage: all

Preference: network.dns.upgrade_with_https_rr and network.dns.use_https_rr_as_altsvc

Devtools bug: N/A

Other browsers:
  * WebKit: unknown. I can't find a bug related to this.

  * Chromium: https://bugs.chromium.org/p/chromium/issues/detail?id=1052476