启动服务出现这么一段 warning... SECURITY WARNING: No secret option provided to Rack::Session::Cookie. This poses a security threat. It is strongly recommended that you provide a secret to prevent exploits that may be possible from crafted cookies. This will not be supported in future versions of Rack, and future versions will even invalidate your existing user cookies.

Called from: /Users/calebx/.rvm/gems/ruby-1.9.3-p194/gems/actionpack-3.2.10/lib/action_dispatch/middleware/session/abstract_store.rb:28:in `initialize'.

wtf...