如何处理同名的多个Cookie？ [英] How to handle multiple cookies with the same name?

问题描述

例如，我有一个应用程序发送以下HTTP头设置为名为a的cookie：

Say for example I had an application sending the following HTTP headers to set to cookie named "a":

Set-Cookie: a=1;Path=/;Version=1
Set-Cookie: a=2;Path=/example;Version=1

如果我在服务器上访问 / example ，两个路径都有效，因此我有两个名为a的cookie！由于浏览器不发送任何路径信息，因此无法区分这两个Cookie。

If I access /example on the server both paths are valid, so I have two cookies named "a"! Since the browser doesn't send any path information, the two cookies cannot be distinguished.

Cookie: a=2; a=1

如何处理这种情况？选择第一个？创建包含所有Cookie值的列表？

How should this case be handled? Pick the first one? Create a list with all cookie values? Or should such a case be considered as a developer's mistake?

推荐答案

从本文介绍SitePoint ：

如果同一名称的多个Cookie与给定的请求URI匹配，则浏览器选择一个。

If multiple cookies of the same name match a given request URI, one is chosen by the browser.

路径越具体优先。但是基于其他属性（包括域）的优先级未指定，并且可能因浏览器而异。这意味着如果您对.example.org和www.example.org设置了相同名称的Cookie，则无法确定将发送哪个Cookie。

The more specific the path, the higher the precedence. However precedence based on other attributes, including the domain, is unspecified, and may vary between browsers. This means that if you have set cookies of the same name against ".example.org" and "www.example.org", you can’t be sure which one will be sent back.

编辑：2010年的信息似乎已过时，浏览器现在可以发送多个Cookie，详情请参阅@Nate的回答

this information from 2010 appears to be outdated, it seems browsers can now send multiple cookies in return, see answer by @Nate below for details

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