How to set session expiration time with django

Session timeout setting

settings

SESSION_COOKIE_AGE=60*30 30分钟。
SESSION_EXPIRE_AT_BROWSER_CLOSE False：会话cookie可以在用户浏览器中保持有效期。True：关闭浏览器，则Cookie失效。
SESSION_COOKIE_DOMAIN 生效站点
SESSION_COOKIE_NAME cookie中保存session的名称

Session is relatively simple to use. request.session is a dictionary class. Sessions are saved in the database.

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按手册和网上的方法在settings.py中设置“SESSION_COOKIE_AGE” 和 “SESSION_EXPIRE_AT_BROWSER_CLOSE” 均不生效。 通过查看django的源代码"middleware.py"才知道这两个参数只有在settings.SESSION_SAVE_EVERY_REQUEST
 为True时才有效。依此在settings.py中设置这个变量后问题解决。
从源代码看SESSION_EXPIRE_AT_BROWSER_CLOSE为True时 SESSION_COOKIE_AGE 不生效。也就是说用户只能二选一，在浏览器关闭时使session失效 或 超时失效。

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#The following method is not used in settings

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request.session.set_expiry(value)

You can pass four different values ​​to it:

* If value is an integer, the session will expire after a number of seconds (applicable to the entire Django framework, that is, the session will expire on the entire page when this value expires).

* If value is a datatime or timedelta, the session will expire after this time.

* If value is 0, the session will become invalid when the user closes the browser.

* If value is None, session will rely on the global session invalidation policy.

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