Asp获取用户真实IP函数(对代理地址仍然有效)

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<%
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'******************************
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'函数：GetUserTrueIP()
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'参数：无
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'描述：取得用户真实IP，对代理地址仍然有效；返回值：文本类型的IP地址
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'示例：GetUserTrueIP()
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'******************************
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Function GetUserTrueIP()
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dim strIPAddr
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If Request.ServerVariables(“HTTP_X_FORWARDED_FOR”) = “” OR InStr(Request.ServerVariables(“HTTP_X_FORWARDED_FOR”), “unknown”) > 0 Then
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strIPAddr = Request.ServerVariables(“REMOTE_ADDR”)
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ElseIf InStr(Request.ServerVariables(“HTTP_X_FORWARDED_FOR”), “,”) > 0 Then
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strIPAddr = Mid(Request.ServerVariables(“HTTP_X_FORWARDED_FOR”), 1, InStr(Request.ServerVariables(“HTTP_X_FORWARDED_FOR”), “,”)-1)
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ElseIf InStr(Request.ServerVariables(“HTTP_X_FORWARDED_FOR”), “;”) > 0 Then
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strIPAddr = Mid(Request.ServerVariables(“HTTP_X_FORWARDED_FOR”), 1, InStr(Request.ServerVariables(“HTTP_X_FORWARDED_FOR”), “;”)-1)
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Else
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strIPAddr = Request.ServerVariables(“HTTP_X_FORWARDED_FOR”)
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End If
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GetUserTrueIP = Trim(Mid(strIPAddr, 1, 30))
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End Function
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%>