第三方cookie丢失解决方案-P3P

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首先，什么是 P3P （ Platform for Privacy Preferences ），其实就是一种可以提供个人隐私保护策略的平台协议。网上去去找，说得更清楚，我就不罗嗦了，我只举个实际例子让大家有个认识。

例如 first.abc.com 这个页面中使用 iframe( 或者 img 、 script 等等方式 ) 嵌入了一个 third.xyz.com 的页面， first.abc.com 会设置一些 cookie 到用户本地，例如 trackid, 由于我们浏览器直接访问就是 first.abc.com ，所以这些 first.abc.com 设置的 cookie 可以称为第一方 cookie ，而 third.xyz.com 也可能需要设置一些 cookie 到本地，例如 uc1 什么的，相对而言，这个 third.xyz.com 设置的 cookie 叫第三方 cookie( 不是本家 ) ，而在 iframe 等发出请求到 third.xyz.com 时，一般希望能够将本域名 (.xyz.com) 下的原有 cookie( 例如这里他自己设置的 uc1) 带上，不过不幸的是由于某些浏览器用户隐私保护设置问题，不会把 third.xyz.com 的 cookie 发送出去，如果 third.xyz.com 需要依赖这些本地发送的 cookie ，那么就会产生问题。

目前 IE6 就默认阻止第三方 cookie 发送，看图：

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当然其他浏览器也有自己相应的默认选项，可以自己去看。那如何让浏览器发送这些 cookie 呢？那就选择这里高级 -> 勾选自动覆盖 cookie 处理，见图：

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