从类中使用 Xamarin Android HttpClient 错误

Question

我有以下代码在访问具有 SSL 的站点时出错。 （错误：SecureChannelFailure（认证或解密失败。）他们的SSL证书有效。直接调用HttpClient代码时没有问题。我的代码有什么问题？

 Uri uri =new Uri("https://jsonplaceholder.typicode.com/posts/1");
  using (HttpClient httpclient = new HttpClientClass())
   {
       var tt = await httpclient.GetAsync(uri);
       string tx = await tt.Content.ReadAsStringAsync();
       Log.Info(TAG, tx);
    }




 public class HttpClientClass : HttpClient
  {
     private HttpClient _httpclient = null;
     private HttpClientHandler messagehandler = new Xamarin.Android.Net.AndroidClientHandler();

     public  HttpClientClass()
     {
       _httpclient = new HttpClient(messagehandler);
      }
   }

没有问题的代码

Uri uri =new Uri("https://jsonplaceholder.typicode.com/posts/1");
  using (HttpClient httpclient = new HttpClient())
   {
       var tt = await httpclient.GetAsync(uri);
       string tx = await tt.Content.ReadAsStringAsync();
       Log.Info(TAG, tx);
    }

Answer 1

感谢Https with TLS 1.2 in Xamarin 这是解决方案。添加 Paul Betts 的 Nuget modernhttpclient 并在下面使用。这应该在课堂上工作或不工作。

            Uri uri = new Uri("https://jsonplaceholder.typicode.com/posts/1");
            using (var httpClient = new HttpClient(new NativeMessageHandler()))
            {
                var tt = await httpClient.GetAsync(uri);
                string tx = await tt.Content.ReadAsStringAsync();
                //Log.Info(TAG, tx);
            }