在 C# 中使用 Webclient 时如何忽略 SSL 检查答案

【问题标题】：How can I ignore SSL checks while using Webclient in C#在 C# 中使用 Webclient 时如何忽略 SSL 检查
【发布时间】：2017-12-06 11:12:30
【问题描述】：

我正在尝试将此 URL 的内容作为字符串获取。

https://noembed.com/embed?url=https://www.youtube.com/watch?v=1FLhOGOg2Qg

这是我正在使用的代码：

        var html_content = "";

        using (var client = new WebClient())

        {


            client.Headers.Add("User-Agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2227.1 Safari/537.36");

            html_content += client.DownloadString("https://noembed.com/embed?url=https://www.youtube.com/watch?v=1FLhOGOg2Qg");


        }
        Console.WriteLine(html_content);
        Console.ReadLine();

这是我得到的错误：

System.Net.WebException was unhandled
  HResult=-2146233079
  Message=The request was aborted: Could not create SSL/TLS secure channel.
  Source=System

我在 WPF 应用程序上使用它，我可以在这里忽略 SSL。我已经尝试过其他忽略 SSL 的答案，但没有一个有效。它适用于其他网址，例如https://www.youtube.com/watch?v=1FLhOGOg2Qg，但不适用于 noembed.com 网址。

【问题讨论】：

标签： c# wpf ssl

【解决方案1】：

添加 ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12; 这对我有用：

var html_content = "";
        ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

        using (var client = new WebClient())

        {


            client.Headers.Add("User-Agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2227.1 Safari/537.36");

            html_content += client.DownloadString("https://noembed.com/embed?url=https://www.youtube.com/watch?v=1FLhOGOg2Qg");


        }
        Console.WriteLine(html_content);
        Console.ReadLine();

我得到的输出：

{"author_url":"https://www.youtube.com/user/nogoodflix","url":"https://www.youtube.com/watch?v=1FLhOGOg2Qg","provider_url":"https://www.youtube.com/","title":"ONE FOR THE MONEY Trailer 2011 Official [HD] Katherine Heigl","author_name":"流媒体剪辑","type":"video","height":270,"thumbnail_height":360,"thumbnail_width":480,"provider_name":"YouTube","html": "\nhttps://www.youtube.com/embed/1FLhOGOg2Qg?feature=oembed\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\">\n","thumbnail_url":"https://i.ytimg.com/vi/1FLhOGOg2Qg/hqdefault.jpg", "版本":"1.0","宽度":480}

【讨论】：