Xamarin Forms：无法建立 SSL 连接

Question

我在 Xamarin Forms 上遇到 SSL 连接问题。它最初工作正常，但现在它给出了例外。同样的 API 在另一个项目中工作正常。

    var siteIdResponse = await client.GetAsync(API CALL);

我的Xamarin.Forms版本是4.5.0282.

我的项目类型是便携类型。

System.Net.Http.HttpRequestException: The SSL connection could not be established System.Security.Authentication.AuthenticationException: Authentication failed, see inner exception. ---> Mono.Btls.MonoBtlsException: Ssl error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED at /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/boringssl/ssl/handshake_client.c:1132

为了参考，我创建了一个示例项目并上传了它here

Answer 1

我做了一个 dependencyService 来获取 HttpClientHandler。

首先。创建接口。

public interface IMyOwnNetService
{
    HttpClientHandler GetHttpClientHandler();
}

然后在android中实现这个接口。

[assembly: Dependency(typeof(MyOwnNetService))]
namespace Business_App.Droid
{
    internal class MyOwnNetService : IMyOwnNetService
    {
        public HttpClientHandler GetHttpClientHandler()
        {
            return new Xamarin.Android.Net.AndroidClientHandler();
        }
    }
}

iOS

[assembly: Dependency(typeof(MyOwnNetService))]
public class MyOwnNetService: IMyOwnNetService {
    public HttpClientHandler GetHttpClientHandler() {
        return new HttpClientHandler();
    }
}

最后，像下面的代码一样使用HttpClient。

var hc = new HttpClient(Xamarin.Forms.DependencyService.Get<IMyOwnNetService>().GetHttpClientHandler());
var siteIdResponse = await hc.GetAsync(API CALL);

Xamarin Forms：无法建立 SSL 连接

Xamarin Forms: The SSL connection could not be established

xamarin.forms