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我正在使用 ASP.NET Core 2.2，我在其中使用来自非安全门户的安全 API（例如https://google.com ）。但是在请求 API 时出现以下错误：

System.Net.Http.HttpRequestException：无法建立 SSL 连接，请参阅内部异常。

我已经尝试过ServerCertificateCustomValidationCallback,等ServerCertificateCustomValidationCallback，ServicePointManager.SecurityProtocol但它没有用。

当我使用时ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12 | SecurityProtocolType.Ssl3;，我收到错误：

System.NotSupportedException：不支持请求的安全协议”

我已经尝试过的示例代码::

1.

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls   |
                                       SecurityProtocolType.Tls11 |
                                       SecurityProtocolType.Tls12 | 
                                       SecurityProtocolType.Ssl3;

2.

using (var httpClientHandler = new HttpClientHandler())
{
    httpClientHandler.ServerCertificateCustomValidationCallback =
        (message, cert, chain, errors) => { return true; };
    using (var client = new HttpClient(httpClientHandler))
    { // somecode }
}

3.

var handler = new HttpClientHandler
{
    ServerCertificateCustomValidationCallback =
        (httpRequestMessage, cert, cetChain, policyErrors) =>
        {
            return true;
        },
        SslProtocols = SslProtocols.Tls12   |
                       SslProtocols.Tls11   |
                       SslProtocols.Tls     |
                       SslProtocols.Ssl3    |
                       SslProtocols.Ssl2    |
                       SslProtocols.Default |
                       SslProtocols.None
};
4

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