使用 HttpClient (.NET) 时出现 SSL 策略错误

Question

我正在尝试使用具有自签名证书的本地 Web 服务器上的 REST API。在运行时，应用程序抛出错误

AuthenticationException：根据验证过程，远程证书无效。

我已尝试在此答案中进行修复： https: //stackoverflow.com/a/1386568/8980983，但错误仍然存​​在。代码如下：

static void Main(string[] args)
    {
        HttpClient httpClient = new HttpClient();
        httpClient.DefaultRequestHeaders.Clear();

        ServicePointManager.ServerCertificateValidationCallback = delegate (
            object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
        {
            return true;
        };
        var loginPage = httpClient.GetAsync("https://<local IP address>/loginpage.html").GetAwaiter().GetResult();

        //do stuff with response...
    }

我可以采取哪些措施来有效忽略 SSL 策略错误？

Answer 1

弄清楚了。结果 HttpClient 类没有使用该ServicePointManager.ServerCertificateValidationCallback方法。解决方案如下：

static void Main(string[] args)
    {
        HttpClientHandler httpClientHandler = new HttpClientHandler();
        httpClientHandler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => { return true; };

        HttpClient httpClient = new HttpClient(httpClientHandler);
        httpClient.DefaultRequestHeaders.Clear();

        var loginPage = httpClient.GetAsync("https://<local IP address>/loginpage.html").GetAwaiter().GetResult();
     }