[FF92] [HTTP] Enabling HTTPS RR on release

[Rumyra]

Acceptance Criteria

• The listed features are documented sufficiently on MDN
• BCD is updated
• Interactive example and data repos are updated if appropriate
• The content has been reviewed as needed

For folks helping with Firefox related documentation

• Set bugs to dev-doc-complete
• Add entry to Firefox release notes if feature is enabled in release
  or
• Add entry to Firefox experimental features page if feature is not yet enabled in release

Features to document

Worth checking the http learning sections & glossary

Related Gecko bugs

https://bugzilla.mozilla.org/show_bug.cgi?id=1721132

Other

For ref: https://emilymstark.com/2020/10/24/strict-transport-security-vs-https-resource-records-the-showdown.html

[hamishwillee]

This actually delivered in FF92. It "sounds like"

• HTTPS RR is a record you can get from DNS that tells you the site supports HTTPS
• Firefox treats this like an Alt-Svc HTTP header, which allows you to switch to a different site/protocol as though you were just getting the info from the requested site.

It isn't clear what engineering think we need (I am asking). I do know that we don't really have a place for this kind of thing - a DNS record that tells you about the HTTPS support. It is also quite early - this spec is still a draft.

Pragmatically I think we should:

• add an MDN release note to FF92 on this.
• Maybe also a glossary entry on HTTPS RR with links to spec.

I am checking for more info here: https://bugzilla.mozilla.org/show_bug.cgi?id=1721132

[Rumyra]

Thanks so much @hamishwillee - really appreciate the investigation. I saw a note on FF92 but it didn't come up when bug searching for that project (another thing that highlights the project process needs a good overhaul).

I'm totally on board with a release note to FF92 & glossary page and am also interested in the response for more info.

[hamishwillee]

@Rumyra You're most welcome. More fun doing this than the tracking the project :-)

All done in #8897 - Release note and glossary. Dev-doc-complete marked. Nothing else required.

Kershaw Chang is going to write a blog at some point, which we might link, but this is all that should be needed for now.

[Rumyra]

Brill! Thanks @hamishwillee