ASP.NET gets client IP

string requestClientIpAddress = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (string.IsNullOrEmpty(requestClientIpAddress))
    requestClientIpAddress = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
if (string.IsNullOrEmpty(requestClientIpAddress))
    requestClientIpAddress = HttpContext.Current.Request.UserHostAddress;

    经过测试  存在负载均衡的时候 ,HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] 取出的是真实的客户端 IP地址 ,而HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"] 和 HttpContext.Current.Request.UserHostAddress 取出的是被分配的保留地址

注：X-Forwarded-For:简称XFF头，它代表代表客户端，也就是HTTP的请求端真实的IP，只有在通过了HTTP 代理或者负载均衡服务器时才会添加该项

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