Signalling "open in app" behaviour for AP content
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@evan @julian @nightpool lots of folks advocated to support any URI scheme in a webfinger lookup, and that's why we have the "acct" scheme at all - so that email-style addresses could be used alongside http etc URIs!
The <Link> approach definitely works, but feels a bit reinventing-webfinger/creating more complexity in lookups (on the client side).
Hope the context is helpful!
So, for finding the AP equivalent of an URL that I think is a Web page, I'd take these steps:
- Link header: HEAD and look for the Link: header (easy, fast)
- Webfinger: Webfinger the URL (a little more complicated)
- Content negotiation: GET with Accept header set to AS2 type
- Parsing: GET and look for Link: header or <link> elementFor finding the HTML page for an AP object:
- Link header: HEAD and look for Link:
- AS2: GET and look for `url` at top level -
So, for finding the AP equivalent of an URL that I think is a Web page, I'd take these steps:
- Link header: HEAD and look for the Link: header (easy, fast)
- Webfinger: Webfinger the URL (a little more complicated)
- Content negotiation: GET with Accept header set to AS2 type
- Parsing: GET and look for Link: header or <link> elementFor finding the HTML page for an AP object:
- Link header: HEAD and look for Link:
- AS2: GET and look for `url` at top levelFor finding the HTML page for an AP object:
- Link header: HEAD and look for Link:
- Content negotiation: HEAD with Accept: set to text/html
- AS2: GET and look for `url` at top level -
So, for finding the AP equivalent of an URL that I think is a Web page, I'd take these steps:
- Link header: HEAD and look for the Link: header (easy, fast)
- Webfinger: Webfinger the URL (a little more complicated)
- Content negotiation: GET with Accept header set to AS2 type
- Parsing: GET and look for Link: header or <link> elementFor finding the HTML page for an AP object:
- Link header: HEAD and look for Link:
- AS2: GET and look for `url` at top level@evan @julian @nightpool in the Postel sense, though, it's too bad that a client implementor needs to maintain (at least) four discovery pathways, and may require four separate requests to validate the information. Similarly, an ap host doesn't know which spots a client will check, so needs to implement all four. I'm well out of the standards game, but I'd very much advocate for "pick one and stick with it"
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@evan @julian @nightpool in the Postel sense, though, it's too bad that a client implementor needs to maintain (at least) four discovery pathways, and may require four separate requests to validate the information. Similarly, an ap host doesn't know which spots a client will check, so needs to implement all four. I'm well out of the standards game, but I'd very much advocate for "pick one and stick with it"
@blaine @julian @nightpool we need you back in the standards game
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@blaine @julian @nightpool we need you back in the standards game
@evan@cosocial.ca @blaine@mastodon.social indeed, four different implementations is not ideal. We're at the point where they're all vying for attention.
Would need to weigh pros and cons of each and see whether there is one winner we can all agree on.
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Does anyone know what the most broadly implemented standard is for signalling that a web page has an alternative ActivityPub endpoint?
What I found online (and with @evan@cosocial.ca and @silverpill@mitra.social's input) was to deliver a
Linkheader and set a<link>tag, but it doesn't seem to work (at least with Megalodon)...When you work on this, consider that there are some situations where the user may want or need to go to the official profile and channel. Older content does not get distributed via ActivityPub, so you have to go to the source (originating website) to see everything.
And I have rarely seen an entire conversation be delivered via ActivityPub. The Zot protocol downloads the whole conversation, but not ActivityPub. With ActivityPub, there are always holes and you have to go to the original thread on the original website to see the whole thing. Maybe we can fix that by adding the ability to download entire threads, not just new posts, but right now seeing the whole conversation over ActivityPub is hit or miss.
Also, many platforms have profile information that is not transmitted over ActivityPub and you would need to visit their real profile to get all of the details.
Plus, in my opinion, it is poor form to create a local profile for someone on another platform and fail to acknowledge that the user is using another platform. At the very least, there should be a link back to their official profile and/or channel (i.e. their posts).
Until ActivityPub can reliably transmit the entire thread, you will need to link back to the original website. -
Thanks @evan@cosocial.ca — that'd be appreciated!
@nightpool@socialhub.activitypub.rocks, this would be helpful in NodeBB's case where we have a web app, so rendering a link to something is just an anchor.
I could theoretically override the anchor click handler to do a backend round-trip to check whether we could load the content in-app, otherwise fall back to a regular browser behaviour (a page navigation).
For example, let's say I link out to Evan's profile here. If NodeBB knew that this link had an alternative AP endpoint, then we could redirect the user instead to the local representation of his profile
@julianFor example, let's say I link out to Evan's profile here. If NodeBB knew that this link had an alternative AP endpoint, then we could redirect the user instead to the local representation of his profile
Wouldn't Evan's AP endpoint be the same as his HTML endpoint?
Most platforms are going to send you to the authoritative profile, which is the one at the user's server.
And if you wanted to redirect a link to a local profile instead of his official profile, you don't need an endpoint to do that. You could simply parse the post and swap out the URL, since you should have data about the user in your database anyway from when you first detected the user.
Maybe I am misunderstanding the use case here, but I am not sure why a platform would not direct you to its own platform for content and profiles. -
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@julian @silverpill the HTML discovery tf doc is filling in. There's still a lot to do but maybe that's a good place to ask questions.
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@julian @silverpill the HTML discovery tf doc is filling in. There's still a lot to do but maybe that's a good place to ask questions.
@julian @silverpill no recos for consumers yet, but: I'd start with content negotiation, then Link headers. From there, fallback to <link> elements in HTML. Last recourse, try Webfinger, especially for non-HTML resources like images.
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Hi @kariboka @julian @evan @silverpill,
I read page, not host. Please refrain from idiosyncratic or obsolete legacy.
