Getting "redirect_uri_mismatch" with Ember Devise and Omniauth-google-oauth2

I've been trying for days to make an authentication & registration with Ember and Rails. I'm using torii and ember-simple-auth in my front-end, and Devise with omniauth-google-oauth2 in my back-end. Things seems to be working just fine in my front-end, but for some reason I get a "redirect_uri_mismatch" error when the server is doing a callback. I configured my Google API, setting all possible Authorized redirect URIs.

I guess it's a problem of Omniauth configuration, but I can't figure out what. Do you have any idea?

Here's the error I get:

I, [2016-04-18T20:00:43.521451 #23779]  INFO -- omniauth: (google_oauth2) Callback phase initiated.
E, [2016-04-18T20:00:43.676108 #23779] ERROR -- omniauth: (google_oauth2) Authentication failure! invalid_credentials: OAuth2::Error, redirect_uri_mismatch: 
{
  "error" : "redirect_uri_mismatch"
}
Processing by Users::OmniauthCallbacksController#failure as JSON
  Parameters: {"code"=>"4/bN-2ay_LyhRHBr9FggEhRTCpNACKMoSvnW-2Olulw2Y"}

Here's my Omniauth config:

require "omniauth-google-oauth2"

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :google_oauth2, ENV["ID_client"], ENV["secret"],
    {
      :name => "google",
      :scope => "profile",
      :prompt => "select_account",
      :image_aspect_ratio => "square",
      :image_size => 50,
      :redirect_uri => 'http://localhost:3000/users/auth/google_oauth2',
      setup: (lambda do |env|
        request = Rack::Request.new(env)
        env['omniauth.strategy'].options['token_params'] = {:redirect_uri => 'http://localhost:3000/users/auth/google_oauth2'}
      end)
    }
end 

My Omniauth controller:

class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController

def google_oauth2
  logger.debug 'Omniauth callback called'
    @user = User.find_for_google_oauth2(request.env["omniauth.auth"], current_user)
    if @user.persisted?
      flash[:notice] = I18n.t "devise.omniauth_callbacks.success", :kind => "Google"
      sign_in_and_redirect @user, :event => :authentication
    else
      session["devise.google_data"] = request.env["omniauth.auth"]
      redirect_to new_user_registration_url
    end
end

end

For my front-end, my torii configuration in environment.js:

ENV.torii = {
  providers: {
    sessionServiceName: 'session',
    'google-oauth2': {
      apiKey: 'ID_client',
      scope: 'profile',
      redirectUri: 'http://localhost:4200'
    }
  }
};

And my torii authenticator:

import Ember from 'ember';
import ToriiAuthenticator from 'ember-simple-auth/authenticators/torii';
import raw from 'ic-ajax';

const { RSVP } = Ember;

export default ToriiAuthenticator.extend({
  torii: Ember.inject.service(),

  authenticate() {
    return new RSVP.Promise((resolve, reject) => {
      this._super(...arguments).then((data) => {

        raw({
          url:      'http://localhost:4200/users/auth/google_oauth2/callback',
          type:     'POST',
          dataType: 'json',
          data: { 'code': data.authorizationCode  }
        }).then((response) => {
          resolve({
            access_token: response.access_token,
            provider: response.provider
          });
        }, reject);
      }, reject);
    });
  }
});