HTTP标头：X-FORWARDED-FOR，X_FORWARDED_FOR和HTTP_X_FORWARDED_FOR有什么区别？ [英] HTTP Headers: What is the difference between X-FORWARDED-FOR, X_FORWARDED_FOR and HTTP_X_FORWARDED_FOR?

问题描述

我看到非RFCXFFHTTP标头的各种拼写，用于标识请求已转发的IP地址。这些不同的标题名称之间是否有区别： X-FORWARDED-FOR ， X_FORWARDED_FOR 和 HTTP_X_FORWARDED_FOR ？我需要查找这三个吗？

I see various spellings of the non-RFC "XFF" HTTP header used for identifying the IP addresses the request has been forwarded through. Is there a difference between these different header names: X-FORWARDED-FOR, X_FORWARDED_FOR, and HTTP_X_FORWARDED_FOR? Do I need to look for all three?

PS - 是的，我知道这个标题很容易被欺骗：）

PS - Yes, I know this header can be easily spoofed :)

推荐答案

某些语言（如PHP）使用HTTP_前缀只是为了区分HTTP标头与其他服务器变量：

The HTTP_ prefix is used by some languages like PHP simply to distinguish HTTP headers from other server variables:

$_SERVER['HTTP_X_FORWARDED_FOR']

HTTP标头名称实际上是

The HTTP header name is actually

X-Forwarded-For

标题名称本身不区分大小写。但是，当您想查询请求标头时，编程语言在很大程度上区分大小写（再次，PHP就是其中之一）。

The header name itself is case insensitive. However, when you want to query a request header, programming languages are largely case sensitive about it (again, PHP is one of them).

X-表示编程语言Forwarded-For标头是非标准的。我不认为语言是否使用短划线或下划线来引用标题名称。

The X- indicates that the Forwarded-For header is non-standard. I don't think there's a difference whether a language uses dashes or underscores to refer to header names.

基本上，它们都是相同的标题，只是提到了不同的通过各种实现。

Essentially, they're all the same header, just referred to differently by various implementations.

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