What steps will reproduce the problem?

Using the demo app call

AuthRequest req = new AuthRequest(GOOGLE_AUTH_URL, GOOGLE_CLIENT_ID).withScopes(BUZZ_READONLY_SCOPE);

This causes the error 400, redirect_uri_mismatch

I've debugged the problem and the library hardcode redirect_uri with value oauthWindow.html. Instead the it is generated by google api console: https://code.google.com/apis/console

I've changed the library passing the redirect_uri to Auth.login method. In attachment the src. To use it in your application set properly the: - GOOGLE_CLIENT_ID - redirectUrl

The Getting Started guide describes this, but possibly could be more clear: "The redirect URL provided by the library is oauthWindow.html, and is hosted at the base path of your GWT app. Remember to add this URL to your auth provider's redirect URLs whitelist, otherwise you will only receive errors indicating "the redirect URI does not match.""

You should change the redirect URIs accepted by the APIs Console to include oauthWindow.html, since oauthWindow.html is an important component of the smoothness of the library's login process.

Specifying another redirect URI to use is not preferrable because it will send your user to another page, and will not be able to communicate with your GWT application that access has been given -- the callback you give to Auth.login() will not be fired.

Thanks for the clarification! I'm going to add oauthWindow.html to allowed redirect URIs.

Just an improvment: adding to login the possibility to add the redirect_uri increase the library flexibility. If the parameter is not passed the library uses oauthWindow.html otherwise uses what you set.

The problem there is that if the user is redirected to another URI besides oauthWindow.html, then the callback in your code will never fire, and you'll have no idea whether they granted access or not.

I see where you're coming from, but I'm not sure that adding this flexibility will improve the overall developer/user experience, and will add complexity to the code and API of the library.

Got it!

I have added it to my redirect URL's and I still have the same problem My redirect URL's are:

https://www.crisisdb.com/cdb/oauth2callback https://www.crisisdb.com/cdb/oauthWindow.html

I have also copied the "oauthWindow.html" file and placed it in the same directory as the "js" file and sample code.