rack cookie session

Rack::Session::Cookie provides simple cookie based session management. The session is a Ruby Hash stored as base64 encoded marshalled data set to :key (default: rack.session). When the secret key is set, cookie data is checked for data integrity.

它是基于cookie的session,如果有两个app 想共用同一个信息  可以使用此方法

Example:

    use Rack::Session::Cookie, :key => 'rack.session',                               :domain => 'foo.com',                               :path => '/',                               :expire_after => 2592000,                               :secret => 'change_me'