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

...

#RFC6415 #RFC7033

If you are developing software for the #Fediverse then —

You should understand about #RFC6415

IETF RFC-6415 — Web Host Metadata
https://www.rfc-editor.org/rfc/rfc6415.html

.I.e.,:

/.well-known/host-meta

.