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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                在ASP中使用 Request.ServerVariables("REMOTE_ADDR") 來取得客戶端的IP地址,但如果客戶端是使用代理服務器來訪問,那取到的就是代理服務器的IP地址,而不是真正的客戶端IP地址。要想透過代理服務器取得客戶端的真實IP地址,就要使用 Request.ServerVariables("HTTP_X_FORWARDED_FOR") 來讀取。不過要注意的事,并不是每個代理服務器都能用 Request.ServerVariables("HTTP_X_FORWARDED_FOR") 來讀取客戶端的真實 IP,有些用此方法讀取到的仍然是代理服務器的IP。還有一點需要注意的是:如果客戶端沒有通過代理服務器來訪問,那么用 Request.ServerVariables ("HTTP_X_FORWARDED_FOR") 取到的值將是空的。因此,如果要在程序中使用此方法,可以這樣處理: ...... userip = Request.ServerVariables("HTTP_X_FORWARDED_FOR") If userip = "" Then userip = Request.ServerVariables("REMOTE_ADDR") ...... ~~~ <% getIP()'由此輸出真實IP '通用函數:如果不能取客戶端真實IP,就會取客戶端的代理IP Private Function getIP() Dim strIPAddr If Request.ServerVariables("HTTP_X_FORWARDED_FOR") = "" OR InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), "unknown") > 0 Then strIPAddr = Request.ServerVariables("REMOTE_ADDR") ElseIf InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ",") > 0 Then strIPAddr = Mid(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), 1, InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ",")-1) ElseIf InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ";") > 0 Then strIPAddr = Mid(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), 1, InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ";")-1) Else strIPAddr = Request.ServerVariables("HTTP_X_FORWARDED_FOR") End If getIP = Trim(Mid(strIPAddr, 1, 30)) End Function response.write getip() %> ~~~   即:如果客戶端通過代理服務器,則取 HTTP_X_FORWARDED_FOR 的值,如果沒通過代理服務器,就取 REMOTE_ADDR 的值。
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