C#调用HTTPS

1、C# .NET Core 使用HttpClient时忽略HTTPS证书
最近项目遇到HttpClient请求代理时报SSL认证失败，解决方案记录
 
var handler = new HttpClientHandler();
handler.ServerCertificateCustomValidationCallback = delegate { return true; };
var client = new HttpClient(handler);
 
2、通过IHttpClientFactory忽略SSL连接错误
 
services.AddHttpClient("aliyun")
    .ConfigureHttpMessageHandlerBuilder(builder =>
    {
        builder.PrimaryHandler = new HttpClientHandler
        {
            ServerCertificateCustomValidationCallback = (m, c, ch, e) => true
        };
    });

或

services.AddHttpClient("aliyun")

　　.ConfigurePrimaryHttpMessageHandler(h => new HttpClientHandler
            {
                ServerCertificateCustomValidationCallback = (m, c, ch, e) => true
            })
    
3:基于IHttpClientFactory具体的实现
 
public async Task<string> GetApi(string url)
{
     var httpClient = _httpClientFactory.CreateClient("aliyun");
     var httpResponseMessage = await httpClient.GetAsync(url);
     var content = await httpResponseMessage.Content.ReadAsStringAsync();
     return content;
}