UWP中Windows.Web.Http.HttpClient在部分设备上调用无响应问题

我曾查阅多篇讨论Windows.Web.Http.HttpClient.GetAsync无法返回控制权的帖子，多数指出死锁问题并建议用ConfigureAwait(false)解决，但这对我的情况无效。

棘手的是，应用在开发机及其他多台设备上运行正常，唯独在新部署的某台设备出问题。应用通过IDE的「发布」功能部署，再在目标设备运行安装程序。我没有目标设备的管理员权限，且安装时未被提示授予应用特定网络权限——这可能是问题根源？

以下是相关代码：

return Task.Factory.StartNew(async () => {
    if(first_ping_attempt) {
        Serilog.Log.Information("First ping attempt...");
    }
    HttpClient http = new HttpClient();
    var cancellation = new CancellationTokenSource(10000);

    HttpStringContent content = new HttpStringContent(FormPingPacket(device_ID, deviceName));
    content.Headers.ContentType = JSONMediaType;
    try {
        var response = await http.PostAsync(PingPostURI, content).AsTask(cancellation.Token).ConfigureAwait(false);
        if(!response.IsSuccessStatusCode) {
            Serilog.Log.Error(String.Format("Ping POST response status code {0}\n  URL: {1}\n  Data:\n{2}", response.StatusCode, PingPostURI, content.ToString()));
        }
        if(first_ping_attempt) {
            Serilog.Log.Information($"POST status: {response.StatusCode}");
        }
    } catch(TaskCanceledException) {
        Serilog.Log.Error("Ping POST Timeout");
    } catch(Exception e) {
        Serilog.Log.Logger.Error(e, $"SendPing: Exception from http.PostAsync: {e.GetType()}: {e.Message}\n  URL: {PingPostURI}");
    }
    content = new HttpStringContent(FormVersionPutPacket());
    content.Headers.ContentType = JSONMediaType;
    cancellation = new CancellationTokenSource(10000);
    try {
        var response = await http.PutAsync(DevicePutURI(device_ID), content).AsTask(cancellation.Token).ConfigureAwait(false);
        // We don't actually care about the response code other than for debugging
        if(!response.IsSuccessStatusCode) {
            Serilog.Log.Error(String.Format("Ping PUT response status code {0}\n  URL: {1}", response.StatusCode, DevicePutURI(device_ID)));
        }
        if(first_ping_attempt) {
            Serilog.Log.Information($"POST status: {response.StatusCode}");
        }
    } catch(TaskCanceledException) {
        Serilog.Log.Error("Ping PUT Timeout");
    } catch(Exception e) {
        Serilog.Log.Logger.Error(e, $"SendPing: Exception from http.PutAsync: {e.GetType()}: {e.Message}\n  URL: {DevicePutURI(device_ID)}");
    }
    if(first_ping_attempt) {
        Serilog.Log.Information("First manager ping complete.");
        first_ping_attempt = false;
    }
});
}

一个UWP计时器每秒调用一次该方法，用_ =语法丢弃返回的Task。Serilog将日志记录到中央日志接收器，日志内容如下：

172.18.0.141    6/12/2025 3:16:07 PM    First ping attempt...
172.18.0.141    6/12/2025 3:17:07 PM    First ping attempt...
172.18.0.141    6/12/2025 3:18:07 PM    First ping attempt...
172.18.0.141    6/12/2025 3:19:07 PM    First ping attempt...
172.18.0.141    6/12/2025 3:20:07 PM    First ping attempt...
172.18.0.141    6/12/2025 3:21:07 PM    First ping attempt...
172.18.0.141    6/12/2025 3:22:07 PM    First ping attempt...
172.18.0.141    6/12/2025 3:23:07 PM    First ping attempt...
172.18.0.141    6/12/2025 3:24:07 PM    First ping attempt...
172.18.0.141    6/12/2025 3:25:07 PM    First ping attempt...
172.18.0.141    6/12/2025 3:26:07 PM    First ping attempt...
172.18.0.141    6/12/2025 3:27:07 PM    First ping attempt...

显然await从未返回，即使设置了10秒后触发的取消令牌。

内容的提问来源于stack exchange，提问作者Brian A. Henning