(.NET) ServicePoint.IPEndPointDelegate不使用代理回调？

Question

我需要绑定HttpWebRequest的本地ip地址(机器有多个ip)。我创建了委托方法，这个方法被调用，并且为没有代理的请求绑定ip，但是一旦我向请求添加了代理详细信息，回调就再也不会发生了

如何绑定使用代理的HttpWebRequests的传出ip地址？

    static void MakeRequest(string url, WebProxy myProxy)
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.ServicePoint.BindIPEndPointDelegate = new BindIPEndPoint(BindIPEndPointCallback);
        request.Proxy = myProxy;
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
    }
    public static IPEndPoint BindIPEndPointCallback(ServicePoint servicePoint, IPEndPoint remoteEndPoint, int retryCount)
    {
        // not called when proxy is set
        Console.WriteLine("BindIPEndpoint called");
        return new IPEndPoint(IPAddress.Parse("192.168.1.58"), 5000);
    } 

有没有其他的方法来绑定https？

Answer 1

要绑定使用代理的请求，请使用ServicePointManager.FindServicePoint；

static void MakeRequest(string url, WebProxy myProxy)
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
    request.Proxy = myProxy;
    ServicePoint sp = ServicePointManager.FindServicePoint(new Uri(url), myProxy);
    sp.BindIpEndPointDelegate = new BindIpEndPoint(BindIpEndPointCallback);
    HttpWebResponse = (HttpWebResponse)request.GetResponse();
}

适用于http请求，遗憾的是，在https请求上仍然不调用委托。