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我有一台具有三个不同网络接口的计算机。我尝试通过其中一种设备发送 JSON 请求。但由于某种原因，the ServicePointof theWebRequest总是错误的。

电脑 IP1：10.43.130.122

电脑 IP2：192.168.2.3

电脑 IP3：10.43.140.33

目标 IP：10.43.130.152

网络中还有其他三台 PC。所有这些都具有三个网络接口，都在相同的 IP 范围内。在所有其他三个上，ServicePoint设置正确并且 JSON 请求有效。

这是我的代码。sp、sp2 和 sp3 只是调试代码。sp 和 sp2 是正确的（目标 ip），但 sp3 总是错误的。它始终是 192.168.25..9:8919。但是，一旦我知道该WebRequest对象ServicePoint从ServicePointManager. 那么这怎么可能呢？

private static bool QueryJson(string url, CancellationToken? cancellationToken, out string result)
{

        lock (webRequestLock)
        {
            HttpWebRequest dataRequest = WebRequest.Create(url) as HttpWebRequest;

            if (dataRequest == null) throw new Exception("dataRequest is not a HttpWebRequest");
            dataRequest.UserAgent = "iSAM Velodyne Interface";

            dataRequest.ContentType = "";
            dataRequest.SendChunked = false;
            dataRequest.ServicePoint.UseNagleAlgorithm = false;
            dataRequest.Method = "GET";
            dataRequest.Accept = "*/*";
            dataRequest.KeepAlive = false;
            dataRequest.ServicePoint.Expect100Continue = false;
            dataRequest.Timeout = TIMEOUT;

            // sp and sp2 ServicePoint have the expected destination IP
            var sp = ServicePointManager.FindServicePoint(dataRequest.RequestUri);
            var sp2 = ServicePointManager.FindServicePoint(new Uri(url));
            // sp3 does does not have the expected IP
            // (Why isn't it getting the same ServicePoint as above?)
            var sp3 = dataRequest.ServicePoint;

            // ...
        }
}
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