sonata-project/GoogleAuthenticator — pull request #3 by scottrobertson (2014-03-21 18:27:53+00:00)
Title: Use chart.googleapis.com instead of google.com

I kept getting 400 errors (there are quite a few reports online of this happening with google.com).

Example:
http://stackoverflow.com/questions/17071368/400-bad-request-when-attempting-to-insert-qr-code-image-for-google-authenticator