[suggestion] Expose more endpoints as Atom feeds

[lofidevops]

User story: I follow news updates with a feed reader (RSS and Atom). I follow microblog updates with a Mastodon client. I want to use a single application to receive all my updates, so that getting updates is simpler.

Suggested solution:

From Mastodon, expose public Atom feeds for:

• my own updates (exists, https://example.com/users/username.atom)
• replies to my updates (something like https://example.com/users/username/with_replies.atom)
• updates from all my followees (something like https://example.com/users/username/following.atom )

And possibly expose private Atom feeds (requiring authentication) for:

• notifications (something like https://example.com/users/username/notifications.atom )

This way I could receive news updates and microblog updates in my feedreader. (I'd still need to use a Mastodon client to reply and/or make new toots.)

Notes:

I'm suggesting Mastodon expose more Atom feeds since following generic RSS/Atom feeds is explicitly not on the Mastodon roadmap (to the best of my recollection, citation needed).

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• [x] I searched or browsed the repo’s other issues to ensure this is not a duplicate.
• [x] This bug happens on a tagged release and not on master (If you're a user, don't worry about this).

[albjeremias]

Is it possible that the links of the rss feed point to the toot link, not to a json blob? How?