Try alternative webfinger resource

webfinger.py

@@ -100,6 +100,26 @@ def webfinger_handle(session, handle: str, http_prefix: str,
         print('ERROR: webfinger_handle ' + wf_handle + ' ' + str(ex))
         return None
 
+    # if the first attempt fails then try specifying the webfinger
+    # resource in a different way
+    if not result:
+        resource = handle
+        if handle == wf_handle:
+            # reconstruct the actor
+            resource = http_prefix + '://' + wf_domain + '/users/' + nickname
+        # try again using the actor as the resource
+        # See https://datatracker.ietf.org/doc/html/rfc7033 section 4.5
+        par = {
+            'resource': '{}'.format(resource)
+        }
+        try:
+            result = \
+                get_json(signing_priv_key_pem, session, url, hdr, par,
+                         debug, project_version, http_prefix, from_domain)
+        except Exception as ex:
+            print('ERROR: webfinger_handle ' + wf_handle + ' ' + str(ex))
+            return None
+
     if result:
         store_webfinger_in_cache(wf_handle, result, cached_webfingers)
     else: