平台：Ubuntu 12.10 x386 环境：Ruby 2.1.0 Rails 4.1.0 Rubygems 2.2.2
我正在尝试安装capybara gem并抛出503错误！我试图改变rubygems的来源，但错误仍然存在。请告诉我解决方法！谢谢
robus@lucy:~$ gem install capybara-webkit
ERROR: While executing gem ... (Gem::RemoteFetcher::FetchError)
bad response Service Unavailable 503 (https://api.rubygems.org/api/v1/dependencies?gems=capybara)