修改application.rb 里的cookestore

config/application.rb

@@ -33,6 +33,9 @@ module Educoderplus
       provider :cas, url: 'https://urp.tfswufe.edu.cn/cas'
     end
 
+    config.middleware.use ActionDispatch::Cookies
+    config.middleware.use ActionDispatch::Session::CookieStore
+
     config.middleware.insert_before 0, Rack::Cors do
       allow do
         origins '*'