COOKIE到底能不能放到服务器端？如果能浏览器如何识别？不能？为什么？-PHP Tutorial-php.cn

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COOKIE到底能不能放到服务器端？如果能浏览器如何识别？不能？为什么？

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Jun 06, 2016 pm 08:45 PM

asp.netjavajspphpprogrammer

COOKIE到底能不能放到服务器端？如果能浏览器如何识别？不能？为什么？

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COOKIE到底能不能放到服务器端？如果能浏览器如何识别？不能？为什么？

不能。

因为HTTP协议是无状态的，即服务器不知道用户上一次做了什么，这严重阻碍了交互式Web应用程序的实现。在典型的网上购物场景中，用户浏览了几个页面，买了一盒饼干和两瓶饮料。最后结帐时，由于HTTP的无状态性，不通过额外的手段，服务器并不知道用户到底买了什么。所以Cookie就是用来绕开HTTP的无状态性的“额外手段”之一。服务器可以设置或读取Cookies中包含信息，借此维护用户跟服务器会话中的状态。

在刚才的购物场景中，当用户选购了第一项商品，服务器在向用户发送网页的同时，还发送了一段Cookie，记录着那项商品的信息。当用户访问另一个页面，浏览器会把Cookie发送给服务器，于是服务器知道他之前选购了什么。用户继续选购饮料，服务器就在原来那段Cookie里追加新的商品信息。结帐时，服务器读取发送来的Cookie就行了。

顺便说一句，服务器那边存在的是HTTP Session。

cookie不就是每次请求浏览器都会带上的一串小文本么,放服务器端是什么概念

能，放服务器上客户端访问不到- -#
你想干嘛……

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