在负载平衡情况下使用 WCF 4.5 RemoteEndpointMessageProperty 获取客户端 IP 地址

我在 IIS 中托管了 WCF 4.5 Restful 服务，我正在尝试使用 RemoteEndpointMessageProperty 获取客户端的 IP 地址 消耗该服务。

Code 1:

private string GetClientIP()
{
  OperationContext context = OperationContext.Current;
  MessageProperties prop = context.IncomingMessageProperties;
  RemoteEndpointMessageProperty endpoint =
         prop[RemoteEndpointMessageProperty.Name] as RemoteEndpointMessageProperty;
  string ip = endpoint.Address;
  return ip;
}

Code 2:

private string GetClientIP()
{
  string retIp = string.Empty;
  OperationContext context = OperationContext.Current;
  MessageProperties prop = context.IncomingMessageProperties;
  HttpRequestMessageProperty endpointLoadBalancer =
  prop[HttpRequestMessageProperty.Name] as HttpRequestMessageProperty;
  if (endpointLoadBalancer.Headers["X-Forwarded-For"] != null)
  {
    retIp = endpointLoadBalancer.Headers["X-Forwarded-For"];
  }
  if (string.IsNullOrEmpty(retIp))
  {
    RemoteEndpointMessageProperty endpoint =
                prop[RemoteEndpointMessageProperty.Name] as RemoteEndpointMessageProperty;
                retIp = endpoint.Address;
  }
  return retIp;
}

但是，由于 WCF 服务托管在负载均衡器后面的 IIS 中，因此 我得到的IP地址始终是负载均衡器的IP。 有什么办法可以解决这个问题，以便我可以获得真实的IP 客户？

OperationContext context = OperationContext.Current;
MessageProperties properties = context.IncomingMessageProperties;
RemoteEndpointMessageProperty endpoint = properties[RemoteEndpointMessageProperty.Name] as RemoteEndpointMessageProperty;
string address = string.Empty;
//http://www.simosh.com/article/ddbggghj-get-client-ip-address-using-wcf-4-5-remoteendpointmessageproperty-in-load-balanc.html
if (properties.Keys.Contains(HttpRequestMessageProperty.Name))
{
    HttpRequestMessageProperty endpointLoadBalancer = properties[HttpRequestMessageProperty.Name] as HttpRequestMessageProperty;
    if (endpointLoadBalancer != null && endpointLoadBalancer.Headers["X-Forwarded-For"] != null)
        address = endpointLoadBalancer.Headers["X-Forwarded-For"];
}
if (string.IsNullOrEmpty(address))
{
    address = endpoint.Address;
}

这在有负载均衡器的情况下有效，在没有负载均衡器的情况下也有效。我有一个端点作为 TCP，另一个端点作为 REST API 的 Web http。