Possible fix for omniauth-oauth2 package support

lib/omniauth/strategies/ely.rb

@@ -42,6 +42,10 @@ module OmniAuth
       def profile_url
         'http://ely.by/u' + raw_info['id'].to_s
       end
+
+      def callback_url
+        options[:redirect_uri] || (full_host + script_name + callback_path)
+      end
     end
   end
 end