There are other possible solutions like cookie session store (session size is limited, no sensible data in sessions), memcached (too much RAM when you have many sessions + no persistence).
还有其他的解决方案如cookie会话仓库(会话长度有限，不能在会话中存放敏感数据)，memcached(无法持久化+难以实现高可用性方案)。
Cookie-based session affinity helps Web applications work with session information in an elegant and efficient fashion.
基于cookie的会话亲和性帮助Web应用程序高效优雅地处理会话信息。
If you see a page displaying a cookie, then session hijacking of the user's account is possible.
如果您看到页面正在显示一个cookie，那么就可能发生用户帐号的会话攻击。
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