我如何从HTTP_X_FORWARDED_FOR正确的IP，如果它包含多个IP地址？ [英] How do I get the correct IP from HTTP_X_FORWARDED_FOR if it contains multiple IP Addresses?

问题描述

如果Request.ServerVariables [HTTP_X_FORWARDED_FOR]返回多个IP的，哪一个我需要和我将如何做它在C＃中？这是我的理解是，如果它是空白或空，然后在客户端计算机不会通过代理，我可以刚刚从Request.ServerVariables [REMOTE_ADDR]获取IP。这是一个正确的语句？

If Request.ServerVariables["HTTP_X_FORWARDED_FOR"] returns multiple ip's, which one do I take and how would I do it in c#? It is my understanding that if it is blank or null, then the client computer is not going through a proxy and I can just get their ip from Request.ServerVariables["REMOTE_ADDR"]. Is this a correct statement?

通过哪一个呢我走，我的意思是我采取的第一个IP列表或最后一个IP是我必须要做的仅仅是将它分成数组，并采取一个我想要的。我真的不知道HTTP_X_FORWARDED_FOR是如何工作的。

By "which one do I take", I mean do I take the first IP in the list or the last IP and is all I have to do is just split it into an array and take the one I want. I am not really sure how HTTP_X_FORWARDED_FOR works.

推荐答案

根据这个中，第X - 转发，对于HTTP标头的格式是：

According to this, the format of X-Forwarded-For HTTP header is:

X-Forwarded-For: client1, proxy1, proxy2, ...

所以，你希望客户端的IP地址应该在列表中的第一个

So the IP address of the client that you want should be the first one in the list

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