Fediverse

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A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, KBin, etc).

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Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration), Search Lemmy

founded 2 years ago

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Can you explain how federation works on protocol level? (programming.dev)

submitted 1 month ago by [email protected] to c/[email protected]

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Let's say we have lemmy instances A, B, C.

alice from A makes a post "Hello, world" to B. What happens? How is it processed on servers A, B, C and how do users from A, B, C receive her post?

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[–] [email protected] 2 points 1 month ago

instances have no native ability to crawl other instances for communities or content

That's not quite true. They don't do it automatically or routinely, but a user can cause a server to read a post from another server by putting its URL into the search box. This can be useful for an end user to manually address a federation glitch.

Here's a concrete example. I was trying to post a comment via lemmy.world, but lemmy.world sits behind Cloudflare, and Cloudflare flagged its content as potentially malicious. I then posted that comment via my own Mastodon server, but push federation to lemmy.world also failed, for the same reason. I could, however cause lemmy.world to pull the comment using the search.