咱們檢測到您的瀏覽器不兼容傳輸層安全協議 (TLS) 1.1 或更高版本，此協議在 Internet 上用於確保您通訊的安全性。

早上使用.Net WebClient類採集亞馬遜數據，返回http 400 Bad Request錯誤，內容裏面有「咱們檢測到您的瀏覽器不兼容傳輸層安全協議 (TLS) 1.1 或更高版本，此協議在 Internet 上用於確保您通訊的安全性。」

因此就想着多是WebClient使用TLS版本太低，查了下資料，全局加上這段代碼。

ServicePointManager.ServerCertificateValidationCallback += ValidateRemoteCertificate; ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

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/// <summary>
        /// Certificate validation callback. /// </summary>
        private static bool ValidateRemoteCertificate(object sender, X509Certificate cert, X509Chain chain, SslPolicyErrors error) { // If the certificate is a valid, signed certificate, return true.
            if (error == System.Net.Security.SslPolicyErrors.None) { return true; } Console.WriteLine("X509Certificate [{0}] Policy Error: '{1}'", cert.Subject, error.ToString()); return false; }

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參考連接：https://stackoverflow.com/questions/20064505/requesting-html-over-https-with-c-sharp-webclient