Information about a person might be discovered via an "acct:" URI, for example, which is a URI that looks like an email address.
A WebFinger resource returns a JSON Resource Descriptor (JRD) describing the entity that is queried.
WebFinger is specified as the discovery protocol for OpenID Connect.
/.well-known/webfingerA WebFinger resource returns a JavaScript Object Notation (JSON) object describing the entity that is queried. The JSON Object is referred to as the JSON Resource Descriptor (JRD).