Обратный вызов отклонен с помощью OmniAuth

Когда я инициирую процесс входа в систему с помощью OmniAuth в приложении Rails 3, если я отменяю его на странице провайдера, меня отправляют обратно на URL-адрес, который выглядит примерно так:

http://example.com/auth/twitter/callback?denied=aUho....

, и мое приложение выдает 500, что я вижу, что это OAuth::Unauthorized: 401 Unauthorized, даже не касаясь каких-либо действий моего контроллера.

Трассировка стека, когда я воспроизвожу ее на своем компьютере, выглядит так:

oauth (0.4.6) lib/oauth/consumer.rb:216:in `token_request'
oauth (0.4.6) lib/oauth/consumer.rb:136:in `get_request_token'
omniauth-oauth (1.0.1) lib/omniauth/strategies/oauth.rb:29:in `request_phase'
omniauth-twitter (0.0.11) lib/omniauth/strategies/twitter.rb:50:in `request_phase'
omniauth (1.1.0) lib/omniauth/strategy.rb:207:in `request_call'
omniauth (1.1.0) lib/omniauth/strategy.rb:174:in `call!'
omniauth (1.1.0) lib/omniauth/strategy.rb:157:in `call'
omniauth (1.1.0) lib/omniauth/strategy.rb:177:in `call!'
omniauth (1.1.0) lib/omniauth/strategy.rb:157:in `call'
omniauth (1.1.0) lib/omniauth/builder.rb:48:in `call'
sass (3.1.19) lib/sass/plugin/rack.rb:54:in `call'
warden (1.1.1) lib/warden/manager.rb:35:in `block in call'
warden (1.1.1) lib/warden/manager.rb:34:in `catch'
warden (1.1.1) lib/warden/manager.rb:34:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.1) lib/rack/etag.rb:23:in `call'
rack (1.4.1) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context'
rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/cookies.rb:338:in `call'
activerecord (3.2.6) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.6) lib/active_record/connection_adapters/abstract/connection_pool.rb:473:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `_run__60653626266012267__call__4496837804684830799__callbacks'
activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.6) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.6) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.6) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.6) lib/rails/rack/logger.rb:26:in `call_app'
railties (3.2.6) lib/rails/rack/logger.rb:16:in `call'
quiet_assets (1.0.1) lib/quiet_assets.rb:20:in `call_with_quiet_assets'
actionpack (3.2.6) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.1) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.6) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.1) lib/rack/lock.rb:15:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/static.rb:62:in `call'
airbrake (3.1.1) lib/airbrake/rack.rb:30:in `call'
airbrake (3.1.1) lib/airbrake/user_informer.rb:12:in `call'
railties (3.2.6) lib/rails/engine.rb:479:in `call'
railties (3.2.6) lib/rails/application.rb:220:in `call'
rack (1.4.1) lib/rack/content_length.rb:14:in `call'
railties (3.2.6) lib/rails/rack/log_tailer.rb:17:in `call'
thin (1.3.1) lib/thin/connection.rb:80:in `block in pre_process'
thin (1.3.1) lib/thin/connection.rb:78:in `catch'
thin (1.3.1) lib/thin/connection.rb:78:in `pre_process'
thin (1.3.1) lib/thin/connection.rb:53:in `process'
thin (1.3.1) lib/thin/connection.rb:38:in `receive_data'
eventmachine (0.12.10) lib/eventmachine.rb:256:in `run_machine'
eventmachine (0.12.10) lib/eventmachine.rb:256:in `run'
thin (1.3.1) lib/thin/backends/base.rb:61:in `start'
thin (1.3.1) lib/thin/server.rb:159:in `start'
rack (1.4.1) lib/rack/handler/thin.rb:13:in `run'
rack (1.4.1) lib/rack/server.rb:265:in `start'
railties (3.2.6) lib/rails/commands/server.rb:70:in `start'
railties (3.2.6) lib/rails/commands.rb:55:in `block in <top (required)>'
railties (3.2.6) lib/rails/commands.rb:50:in `tap'
railties (3.2.6) lib/rails/commands.rb:50:in `<top (required)>'
script/rails:6:in `require'
script/rails:6:in `<top (required)>'
-e:1:in `load'
-e:1:in `<main>'

Если я войду в систему (не нажимая кнопку отмены на странице Twitter), все будет работать правильно, как и ожидалось. То же самое и с Facebook, я могу войти в систему, но если я нажму «отмена» на странице Facebook, меня перенаправят обратно, и я выкину 500.

Есть ли способ справиться с этим лучше? Я хотел бы иметь возможность показать красивую страницу.