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Dim ClientIP As String = ""
Dim isProxy As String = ""
'取得ClientIP
isProxy = HttpContext.Current.Request.ServerVariables("HTTP_VIA")
Try
isProxy = HttpContext.Current.Request.ServerVariables("HTTP_VIA")
If (IsNothing(isProxy)) Then
ClientIP = HttpContext.Current.Request.ServerVariables("REMOTE_ADDR").ToString() '一般 Client IP
ElseIf (HttpContext.Current.Request.ServerVariables("HTTP_X_FORWARDED_FOR") IsNot Nothing) Then
ClientIP = HttpContext.Current.Request.ServerVariables("HTTP_X_FORWARDED_FOR").ToString().Split(",")(0) 'Proxy 內的客戶真實IP
Else
ClientIP = HttpContext.Current.Request.ServerVariables("REMOTE_ADDR").ToString() '無法取得真實IP，只能使用原方法取值，但可能取到Proxy IP
End If
'判斷IP是否正確，避免被插入SQL Inject
If Not IsIP(ClientIP) Then
'Throw New Exception("不合法IP組態") 'ClientIP = ""
End If
Catch ex As Exception
'My.Computer.FileSystem.WriteAllText(Server.MapPath("~/") + "myError.txt", ex.Message, True)
End Try
Return ClientIP
End Function
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