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   string ip =System.Web.HttpContext.Current.Request.UserHostAddress;
    »ò string ip =System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
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private static string getIp()
 {
     if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_VIA"] != null)  
      return System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].Split(new char[] { ',' })[0];     
    else 
      return System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
 }
Request.ServerVariables["HTTP_VIA"] ,ServerVariables["HTTP_X_FORWARDED_FOR"],Request.ServerVariables["REMOTE_ADDR"]µÄÖµ·ÖÏÂÃæ¼¸ÖÖÇé¿ö:
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      REMOTE_ADDR = Óû§µÄ IP
      HTTP_VIA = ûÊýÖµ»ò²»ÏÔʾ
      HTTP_X_FORWARDED_FOR = ûÊýÖµ»ò²»ÏÔʾ
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      REMOTE_ADDR = ×îºóÒ»¸ö´úÀí·þÎñÆ÷ IP
      HTTP_VIA = ´úÀí·þÎñÆ÷ IP
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