Httpclient Xamarin表单调用在Android中不工作

在android物理设备上调试xamarin表单应用程序时,我遇到了一个奇怪的问题。

应用程序进入中断模式,下面是我收到的输出:

  Mono.Android[0xd6be8960] -> System[0xd6be9680]: 14
    11-24 23:44:44.098 I/Choreographer(18685): Skipped 930 frames!  The application may be doing too much work on its main thread.
    Thread started: <Thread Pool> #8
    Thread started: <Thread Pool> #9
    11-24 23:44:44.807 D/Mono    (18685): Assembly Ref addref Mono.Security[0xc17989e0] -> System[0xd6be9680]: 15
    Thread started: <Thread Pool> #10
    An unhandled exception occured.

Microsoft.Bcl.Build
Microsoft.net.HTTP
Newtonsoft.json

这是我的代码,在UWP中运行良好 var request=new HttpRequestMessage();

    request.RequestUri = new Uri("https://jsonplaceholder.typicode.com/users");
    request.Method = HttpMethod.Get;

    request.Headers.Add("Accept", "application/json");
    var client = new HttpClient();
    HttpResponseMessage response = await client.SendAsync(request);
    HttpContent content = response.Content;
    var statusCode = response.StatusCode;
    var json = await content.ReadAsStringAsync();

编辑:设备日志中有两个主要错误:

[ERROR] FATAL UNHANDED EXCEPTION: System.Net.HttpRequestException:An error occurred while sending the request --> System.Net.WebException:Error:SecureChannelFailure(The authentication or decryption has failed)