HttpClient - 如何判断服务器是否更快地关闭？

我正在使用.NETHttpClient向我的服务器发送请求。我已经设定HttpClient.Timeout属性为 10 秒，所以我得到了A task was cancelled每当服务器无法在 10 秒内处理我的请求时，就会出现异常。到这里为止都很好。

However, if the server is shut down it takes for the HttpClient around ~20 seconds to return a proper exception such as the one in the picture.

我希望看到这个异常的速度超过 10 秒，以便能够区分服务器关闭和操作花费太长时间的情况。我在 msdn 文档中找不到任何关于此的信息。是否可以设置超时时间HttpClient?

这是我构建的方式HttpClient

 var webRequestHandler = new WebRequestHandler
        {
            UseProxy = false,
            Proxy = null,
            AllowPipelining = false,
            ContinueTimeout = TimeSpan.Zero,
            UseCookies = false,
            AllowAutoRedirect = false,
        };
 var httpClient = new HttpClient(webRequestHandler);
 httpClient.Timeout = timeout;

  httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Accept", "application/json");
  httpClient.DefaultRequestHeaders.TryAddWithoutValidation("User-Agent", userAgent);
  httpClient.DefaultRequestHeaders.ExpectContinue = false;

这个答案只是扩展了@brz 的例子。

您可以使用这种不会阻塞线程的方法（Task.Wait 阻塞线程)

var timeout = Task.Delay(10000); // 10 seconds timeout
var request = httpClient.GetAsync("http://www.google.com");

await Task.WhenAny(timeout, request); // wait for either timeout or the request

if (timeout.IsCompleted) // if the timeout ended first, then handle it
{
    // handle timeout
}

// otherwise continue processing the request result
var response = await request;