HttpWebRequest指定IP請求

一個服務器上配置多個外網IP ，HttpWebRequest實現指定IP的域名請求（也可以考慮使用代理實現）

需要使用HttpWebRequest的ServicePoint.BindIPEndPointDelegate代理實現
注：(如果IP指定錯誤，服務器好像會使用默認最優先IP請求)

    /// <summary>
    /// 通過設置這個屬性，可以在發出連接的時候綁定客戶端發出連接所使用的IP地址。 
    /// </summary>
    /// <param name="servicePoint"></param>
    /// <param name="remoteEndPoint"></param>
    /// <param name="retryCount"></param>
    /// <returns></returns>
    public static IPEndPoint BindIPEndPointCallback(ServicePoint servicePoint, IPEndPoint remoteEndPoint, int retryCount)
    {
        return new IPEndPoint(IPAddress.Parse("192.168.1.1"), 0);//端口號
    }
    /// <summary>
    /// 一個服務器上面配置多個IP 固定出網IP
    /// </summary>
    public static void MakeRequest()
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.baidu.com");
        //設置本地的出口ip和端口
        request.ServicePoint.BindIPEndPointDelegate = new BindIPEndPoint(BindIPEndPointCallback);
        if (ServicePointManager.DefaultConnectionLimit < 10)
        {
            ServicePointManager.DefaultConnectionLimit = 10;
        }
        //req.ServicePoint.ConnectionLimit=int.Max;  //允許最大連接數 

        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        response.ToString();
    }

 

也可以直接寫成

        request.ServicePoint.BindIPEndPointDelegate = delegate
        {
            return new IPEndPoint(IPAddress.Parse(ip), 0);
        };