study_auth.rbuse Rack::Session::Cookie, # :key => 'rack.session', # :domain => 'takumakei.blogspot.com', # :path => '/', :expire_after => 3600, :secret => 'changeme' helpers do def auth_ok?(id, pw) id == 'id' && pw == 'pw' end def login if auth_ok?(params['id'], params['pw']) session[:login] = 'What should i have to put here ?' redirect '/' else erb :login end end def logout session.delete(:login)