I think the answer is the same as for the previous question: your URLFetch is acting like an external client (ie. running cURL from your laptop) and it's being redirected to the authentication page (which is on a completely different set of servers and doesn't respond to OPTIONS).
Attila -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/3f9fe105-adc1-49fb-8c06-a8d458bef63c%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
