title: Why am I getting a SACSID cookie from google appengine login instead of an ACSID?
body: <p>I've got an android app that authenticates to an appengine app. I've had it working for a little while, until the authToken supplied to me (by android's AccountManager) expired, causing a 500 error when I tried to use it to get a session cookie.</p>
  
  <p>I have now invalidated the authToken, but after that I still cannot authenticate. However, instead of throwing a 500 (as it did with the invalid auth token), it responds just like the successful case - but instead of setting a "ACSID" cookie as I expect, it sets "SACSID". It looks a lot like an authentication cookie (in that it's random-looking and long), but attempting to access authenticated resources using this cookie redirects me to the login page.</p>
  
  <p>Any idea what's going on?</p>