Xamarin：在超时完成之前取消HttpClient请求

Question

我希望在我的代码中指定的超时90秒之前运行异步任务时取消HttpClient请求：

CancellationTokenSource cts = new CancellationTokenSource();

public async Task<string> GetData()
{
  try
  {
    CookieContainer cookies = new CookieContainer();
    cookies.SetCookies(uri, strCookie);
    HttpClientHandler handler = new HttpClientHandler();
    handler.CookieContainer = cookies;
    HttpClient client = new HttpClient(handler);
    client.Timeout = new TimeSpan(0, 0, 90);
    var response = await client.GetAsync(uri,HttpCompletionOption.ResponseHeadersRead,cts.Token);
    res = await response.Content.ReadAsStringAsync();
    return res;
  }
  catch (Exception ex)
  {
    throw ex;
  }
}

public void CancelTask()
{
    cts.Cancel();
}

在执行GetData()方法的某个时间点我正在调用CancelTask()方法立即取消请求，它会一直持续到90秒的超时。 是否可以在达到超时值之前取消任务。我这样做是为了解决我的应用程序中的特定场景。