GWT OAuth2 + Chrome Extension

[ustakraharez]

Dear All,

I set up a very simple sample http://code.google.com/p/gwt-oauth2/ authentication here:

http://www.geogebra.org/web/web_gui/ 

Just an alert answer, click to "login to google".

However, I can't succeed to do this in the same packaged .crx, I got this error: Invalid parameter value for redirect_uri: Invalid scheme: chrome-extension://mhiejejgcebfpeeghepmffijbaboahll/web/oauthWindow.html

Is it okay, because our "back end" on appspot.com really don't allow to insert this redirect uri.

Is it possible at all (to authenticate from an extendison)?

Thanks for advance,

Gabor