I modified the web site at https://smartcard-atr.appspot.com/ to automatically redirect to https://smartcard-atr.apdu.fr/ (after 10 seconds so you have some time to read the message).
The idea is to tell people that the service has moved. You should use only the new site now. See also "Parsing an ATR: new web site URL".
I do not want to use Google App Engine (GAE) any more and do not plan to maintain the old web site (hosted at GAE). So instead of giving access to an unmaintained code I redirect to the new and maintained web site.
Please update your bookmarks.