C#通过httpclient调用https请求时，报错

错误信息为：The remote certificate is invalid according to the validation procedure

该错误是由于使用httpclient访问不合法的https站点导致出现的异常。

处理代码如下

public static string HttpPostWithToken(string url, string jsonStr, string token, int timeout = 15)
{
    string info = "";
    try
    {
        var handler = new HttpClientHandler() { };
        handler.ServerCertificateCustomValidationCallback += (sender, cert, chain, sslPolicyErrors) => { return true; };
        handler.SslProtocols = SslProtocols.None;
        HttpClient httpClient = new HttpClient(handler) { Timeout = TimeSpan.FromSeconds(timeout) };

        var message = new HttpRequestMessage(HttpMethod.Post, url);
        httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("AU",token);
        if (!string.IsNullOrEmpty(jsonStr))
        {
            message.Content = new StringContent(jsonStr, Encoding.UTF8, "application/json");
            
        }
        
        HttpResponseMessage response = httpClient.SendAsync(message).Result;
        info = response.Content.ReadAsStringAsync().Result;
    }
    catch (Exception e)
    {
        log.Error(string.Format("请求POST接口失败，URL={0},Error={1},Param={2}", url, JsonConvert.SerializeObject(e), jsonStr));
    }
    return info;
}

引用：https://blog.csdn.net/u013667796/article/details/130442415