Weird — #Pleroma 's #WebFinger can return (#XML based) #XRD data (rather than just (#JSON based) #JRD data).

I think the expectation from IETF #RFC7033 is that — WebFinger returns JRD (i.e., JSON Resource Descriptor format).

...

I wonder if this causes any problems with any 3rd party client apps.

As far as the #Fediverse 's usage of #WebFinger is concerned —

Fediverse software (including Mastodon, Pixelfed, Calckey, Pleroma, Lemmy, etc) don't seem to use the #JRD “property” element.

But if any of them ever do — since the "type" is supposed to be a URI — I think it would be better to use something like a #tagURI or something like it (rather than an HTTP(S)-URI).

Else it may suffer from #linkRot (just ostatus·org).

Using Web Host Metadata's #XRD & #JRD to figure out where #WebFinger is seems unnecessarily complex to me.

(This is used by some #Fediverse software.)

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/.well-known/host-meta

/.well-known/host-meta.json

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#RFC6415 #RFC7033

Using Web Host Metadata's #XRD & #JRD to figure out where #WebFinger is seems unnecessarily complex to me.

(This is used by some #Fediverse software.)

...

/.well-known/host-meta

/.well-known/host-meta.json