c# - 在 C# 中使用 Webclient 时如何忽略 SSL 检查

Question

我正在尝试以字符串形式获取此 URL 的内容。

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

这是我使用的代码:

        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，但都没有用。它适用于其他网址，例如 https://www.youtube.com/watch?v=1FLhOGOg2Qg但不能使用 noembed.com URL。

Answer 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 预告片 2011 官方 [高清] 凯瑟琳Heigl","author_name":"Streaming Clips","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 ","version":"1.0","width":480}