Ben, when things are fetched using UrlFetch the app-id is send along with the request in the headers somewhere. It should be feasible to block Mr. fsd4353 from your site.
I believe it is in the User-Agent. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.