Firefox HTTPS-only mode breaks sites that return 404 for HTTPS connections

From	Celejar <celejar@gmail.com>
Newsgroups	linux.debian.user
Subject	Firefox HTTPS-only mode breaks sites that return 404 for HTTPS connections
Date	2021-04-14 18:20 +0200
Message-ID	<C3Qpb-5U5-5@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hi,

I recently switched to Firefox's native HTTPS-Only mode from the
HTTPS Everywhere extension, and I've just made the nasty discovery that
a bunch of links that had been returning 404, which I had been assuming
were dead links, were actually perfectly valid pages, which Firefox had
been "upgrading" to HTTPS, and then getting 404s from web servers that
weren't offering them via HTTPS (but still apparently accepting
connections via HTTPS). Clicking on the little lock icon and turning
HTTPS-Only mode off for the website doesn't seem to have any effect -
the only thing that lets me actually access these pages is turning off
HTTPS-Only mode via the general Settings page (or about:config).

When the website doesn't offer HTTPS at all, then Firefox offers to
connect via HTTP, after a warning, and that's fine. But having pages
become completely inaccessible is intolerable - I now have to check
every 404 I get by turning off HTTPS-Only mode and seeing if the
page is actually there. Am I missing something here, or is HTTPS-Only
mode just badly broken?

https://blog.mozilla.org/security/2020/11/17/firefox-83-introduces-https-only-mode/
https://news.ycombinator.com/item?id=25121604

Celejar

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Thread

Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Celejar <celejar@gmail.com> - 2021-04-14 18:20 +0200
  Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS connections riveravaldez <riveravaldezmail@gmail.com> - 2021-04-14 21:10 +0200
    Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Nito <nito@dismail.de> - 2021-04-15 02:40 +0200
    Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Celejar <celejar@gmail.com> - 2021-04-15 04:30 +0200
  Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections piorunz <piorunz@gmx.com> - 2021-04-15 00:00 +0200
    Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Celejar <celejar@gmail.com> - 2021-04-15 04:20 +0200
      Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS connections Kenneth Parker <sea7kenp@gmail.com> - 2021-04-15 05:00 +0200
        Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS connections Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2021-04-15 06:00 +0200
          Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS connections Kenneth Parker <sea7kenp@gmail.com> - 2021-04-15 07:20 +0200
            Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Dan Ritter <dsr@randomstring.org> - 2021-04-15 15:40 +0200
              Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS connections Kenneth Parker <sea7kenp@gmail.com> - 2021-04-15 16:40 +0200
              Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Richard Hector <richard@walnut.gen.nz> - 2021-04-16 03:10 +0200
                Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Tixy <tixy@yxit.co.uk> - 2021-04-16 10:40 +0200
              Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Jonathan Dowland <jon+debian-user@dow.land> - 2021-04-16 12:40 +0200
      Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections piorunz <piorunz@gmx.com> - 2021-04-15 12:20 +0200
        Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Darac Marjal <mailinglist@darac.org.uk> - 2021-04-15 12:50 +0200
          Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Jonathan Dowland <jon+debian-user@dow.land> - 2021-04-15 14:40 +0200
            Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Jonathan Dowland <jon+debian-user@dow.land> - 2021-04-15 14:40 +0200
        Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Greg Wooledge <greg@wooledge.org> - 2021-04-15 13:30 +0200
        Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Celejar <celejar@gmail.com> - 2021-04-15 14:20 +0200
          Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Eduardo M KALINOWSKI <eduardo@kalinowski.com.br> - 2021-04-15 14:40 +0200
            Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Celejar <celejar@gmail.com> - 2021-04-15 17:20 +0200
          Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections mett <mett@pmars.jp> - 2021-04-15 14:50 +0200
            Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections piorunz <piorunz@gmx.com> - 2021-04-15 16:20 +0200
              Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Erwan David <erwan@rail.eu.org> - 2021-04-15 16:50 +0200
                Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections piorunz <piorunz@gmx.com> - 2021-04-15 17:50 +0200
                Re: Firefox HTTPS-only mode breaks sites that return 404 for HTTPS  connections Jonathan Dowland <jon+debian-user@dow.land> - 2021-04-16 13:30 +0200

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