Web 浏览器的 cookie 密钥的最大大小是多少? [英] What is the maximum size of a web browser's cookie's key?

问题描述

Web 浏览器的 cookie 密钥的最大大小是多少?

What is the maximum size of a web browser's cookie's key?

我知道 cookie 的最大大小是 4KB，但密钥也有限制吗?

I know the maximum size of a cookie is 4KB, but does the key have a limitation as well?

推荐答案

你读到的 4K 限制是针对整个 cookie 的，包括名称、值、到期日期等.如果你想支持大多数浏览器，我建议保留name 小于 4000 字节，总 cookie 大小小于 4093 字节.

The 4K limit you read about is for the entire cookie, including name, value, expiry date etc. If you want to support most browsers, I suggest keeping the name under 4000 bytes, and the overall cookie size under 4093 bytes.

需要注意的一件事:如果名称太大，则无法删除 cookie(至少在 JavaScript 中).通过更新 cookie 并将其设置为过期来删除 cookie.如果名称太大，比如 4090 字节，我发现我无法设置到期日期.我只是出于兴趣而研究这个，并不是我打算拥有一个那么大的名字.

One thing to be careful of: if the name is too big you cannot delete the cookie (at least in JavaScript). A cookie is deleted by updating it and setting it to expire. If the name is too big, say 4090 bytes, I found that I could not set an expiry date. I only looked into this out of interest, not that I plan to have a name that big.

要了解更多信息，请参阅浏览器 Cookie 限制".适用于常见浏览器.

To read more about it, here are the "Browser Cookie Limits" for common browsers.

尽管如此，如果您想支持大多数浏览器，则不要超过每个域 50 个 cookie，以及每个域 4093 个字节.即所有cookies的大小不能超过4093字节.

While on the subject, if you want to support most browsers, then do not exceed 50 cookies per domain, and 4093 bytes per domain. That is, the size of all cookies should not exceed 4093 bytes.

这意味着您可以拥有 1 个 4093 字节的 cookie，或 2 个 2045 字节的 cookie，等等.

This means you can have 1 cookie of 4093 bytes, or 2 cookies of 2045 bytes, etc.

由于 IE7，我曾经说 4095 字节，但是现在 Mobile Safari 有 4096 字节，每个 cookie 有 3 字节的开销，所以最多 4093 字节.

I used to say 4095 bytes due to IE7, however now Mobile Safari comes in with 4096 bytes with a 3 byte overhead per cookie, so 4093 bytes max.

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