One more try at getting the currect url.

crc/models/file.py

@@ -156,7 +156,7 @@ class FileSchema(Schema):
 
     def get_url(self, obj):
         token = 'not_available'
-        base_url = connexion.request.host_url
+        base_url = flask.app.request.url_root
         if obj.id is None:
             return "" # We can't return a url for a file that isn't stored yet.
         file_url = url_for("/v1_0.crc_api_file_get_file_data_link", file_id=obj.id)