来自印度的MCT Maulik Patel提供了一种服务端的获取IP解决方案
if(Context.Request.ServerVariables["HTTP_VIA"]!=null) // using proxy
{
ip=Context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString(); // Return real client IP.
}
else// not using proxy or can't get the Client IP
{
ip=Context.Request.ServerVariables["REMOTE_ADDR"].ToString(); //While it can't get the Client IP, it will return proxy IP.
}
PS
1. 有些代理是不会发给我们真实IP地址的
2. 有些客户端会因为“header_access deny”的安全设置而不发给我们IP
但是由于第二个备注在我们获取real client IP.出错（所以对上面的解决方案做如下调整）
现在做如下解决方案
/// <summary>
/// 获取远程IP
/// </summary>
/// <returns>远程主机的IP地址</returns>
public static string GetCustomerIP()
{
string CustomerIP="";
if (HttpContext.Current.Request.ServerVariables["HTTP_VIA"] != null)// using proxy
{
try
{
// Return real client IP.
CustomerIP = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
}
catch
{
//While it can't get the Client IP, it will return proxy IP.
CustomerIP = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
}
}
else
{
//While it can't get the Client IP, it will return proxy IP.
CustomerIP=HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
}
return CustomerIP;
}