c# HttpClient禁止缓存

using (var client = new HttpClient())
{

//方法1：

                CacheControlHeaderValue cacheControl = new CacheControlHeaderValue();
                cacheControl.NoCache = true;
                cacheControl.NoStore = true;
                client.DefaultRequestHeaders.CacheControl = cacheControl;

//方法2：

                //client.DefaultRequestHeaders.Add("Cache-Control", "no-cache");
                try
                {
                    client.GetStringAsync(url);
                    return true;
                }
                catch
                {
                    return false;
                }
            }

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c# HttpClient禁止缓存

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