用户单击back按钮，而会话仍经过身份验证，并被重定向到node.js中的登录页面

I have a simple web application which has a login screen and an activity page which is only accessible when the user has supplied valid credentials. Assuming the user clicks on login with valid credentials and gets re-directed to the activity page.Now the user does not click on logout, instead he/she simply clicks on the back button of the browser and goes back to the login page. This behavior is obviously non-intuitive , I would assume while the user is logged in and he/she clicks on the back button to remain on the same page and not go back to the login page.I have a simple web application which has a log