sessionID是怎么在客户端和服务器端传递的
sessionID是如何在客户端和服务器端传递的?
我现在的理解是：
一开始服务器端通过接口把sessionid传给客户端，客户端（android）浏览整个应用都通过url的方式带着sessionid与服务器进行交互。
问题是：
服务器端是用php做的，客户端发送请求时，我获取它的sessionid，怎么来判断这个id是否有效，是否已经过期了呢？
查到有人会在数据库里生成一堆的sessionid，并记录它们的使用状态。然后客户端发送请求时，就会去检查这个sessionid是否有效，如果无效，就会给其分配一个没有用过的sessionid.
请大牛们指点迷津。到底该如何实现客户端和服务器端传递sessionid，谢谢。
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