“ Header append Vary User-Agent”与“ Header append Vary User-Agent”相反，如何删除“ User-Agent”来自“ Vary”的字符串？ [英] What's the opposite of "Header append Vary User-Agent", how to remove the "User-Agent" string from "Vary"?

问题描述

我知道我可以将 User-Agent 添加到 Var http标头中，并在其中添加此行。 htacess：

I know that I can add the User-Agent to the Vary http header with this line in my .htacess:

Header append Vary User-Agent

但是如何从 Var 标头中删除 User-Agent

But how can I remove the User-Agent from the Vary header if it is already set?

根据 mod_headers文档中有一个 append 选项，但没有等效的删除选项。

According to the mod_headers doc there is an append option, but no equivalent "remove" option.

推荐答案

下面是简单的答案，但是您需要一些技巧来避免发送空的Vary：标头（尝试避免出现偏执狂） ）

Simple answer below, but you need some shenanigans to avoid sending an empty Vary: header (try to avoid it out of paranoia)

Header edit Vary (.*)User-Agent(.*) $1$2
# Remove leading or trailing ',' without making things complex above
Header edit Vary ^,?(.*),?$ $1
# 2.4-only: remove empty Vary header
Header unset Vary "expr=resp('Vary') =~ /^$/"

x-never-match不太可能到曾经使用过的标题名称。

x-never-match can be any unlikely-to-ever-be-used header name.

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