Feature Request: `<link rel="alternate" type="application/activity+json">`

[saschanaz]

What

Consider adding the link rel=alternate element as you can see in Mastodon/Misskey, e.g. in https://fosstodon.org/@krosylight:

<link href='https://fosstodon.org/@krosylight.rss' rel='alternate' type='application/rss+xml'>
<link href='https://fosstodon.org/users/krosylight' rel='alternate' type='application/activity+json'>

Why

This element advertises that the page can be read in ActivityPub form too. Browser extensions can detect it and reopen it on Mastodon for example.

How

No response

[pfefferle]

I thought about that a lot and wanted to write a FEP to use rel-alternate as alternative to content negotiation!

My issue with the current implementations is that it still needs conneg, but I would expect that it should work similar to the RSS link header (you referenced) instead. That means that it should return Activity-JSON by default, regardless of the Accept header.

From the HTML spec:

If the alternate keyword is used with the type attribute, it indicates that the referenced document is a reformulation of the current document in the specified format.

So it should be more like

<link href='https://fosstodon.org/@krosylight.json' rel='alternate' type='application/activity+json'>

instead!

[pfefferle]

See https://github.com/mastodon/mastodon/issues/22306

[github-actions[bot]]

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[saschanaz]

Have you written an RFP? 👀