Rails 3.1 OmniAuth with Facebook - Failure, but dont send error

I'm facing a weird problem.

I followed this tutorial : https://github.com/plataformatec/devise/wiki/OmniAuth:-Overview

It works perfectly with the exact same code on my local machine (with modification on APP_ID and SECRET).

But when I test it on another server, I cant get logged in with Facebook informations...

I click on the link (<%= link_to 'register with fb', user_omniauth_authorize_path(:facebook) %>) then I'm redirected well to Facebook which asks me if I allow the app and finally I get redirected to my site.

But I'm redirected to /user/sign_in ! And no record with the user retrieved from Facebook is created.

The log gives me :

Started GET "/users/auth/facebook" for 192.168.1.254 at 2011-07-25 19:06:11 +0400

Started GET "/us开发者_运维技巧ers/auth/facebook/callback?code=grV09GQr[...]BbcM-mxklOu5E"

for 192.168.1.254 at 2011-07-25 19:06:12 +0400 Processing by Users::OmniauthCallbacksController#failure as HTML Parameters:

{"code"=>"grV09GQrqjDepasyQpVhqSg0FINlr4h9[...]sSUooMrBRxBbcM-mxklOu5E"}

Redirected to http://mysite.com/users/sign_in Completed 302 Found in 1ms

Someone has an idea ? Many Thanks

You are getting the sign-in page because this is the default behavior for the omniauth gem when an error occurs from facebook. You are getting rejected from facebook. If you were to decode the code in the returned URL, you might be able to figure out the reason. It would be helpful if the error handler did that.

With facebook connect you must put the url of your website in the facebook configuration. It is the canvas URL or web site url/domain in the configuration. If you don't have this set correctly, then facebook will reject your return request.