The request was canceled due to the configured HttpClient.Timeout of 100 seconds elapsing.

当使用HttpClient发起请求时，如果超出了预设的超时时间（这里是100秒），请求会被自动取消并抛出一个`TaskCanceledException`[^2]。具体来说，如果你有一个异步操作[^1]，它可能会像这样：

using System.Net.Http;
using System.Threading.Tasks;

// 假设这是一个发起HTTP GET请求的方法
async Task<string> DownloadDataAsync()
{
    using (var client = new HttpClient())
    {
        client.Timeout = TimeSpan.FromSeconds(100); // 设置超时时间为100秒

        try
        {
            HttpResponseMessage response = await client.GetAsync("http://example.com/data");
            if (response.IsSuccessStatusCode)
            {
                return await response.Content.ReadAsStringAsync();
            }
            else
            {
                throw new Exception($"Request failed with status code {response.StatusCode}");
            }
        }
        catch (HttpRequestException ex)
        {
            if (ex.InnerException is TaskCanceledException)
            {
                Console.WriteLine("The request was canceled due to timeout.");
            }
            else
            {
                Console.WriteLine(ex.Message);
            }
            return null; // 或者执行其他错误处理逻辑
        }
    }
}

在这个示例中，如果超过100秒还没有收到响应，`GetAsync`方法会抛出异常，程序会捕获这个异常并打印"The request was canceled due to timeout."。