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源码中，看见使用HttpClient，会造成一些问题

Blog.NETCore/Leo.Framework/Helper/HttpHelper.cs

Line 31 in 4eee496

using (HttpClient client = new HttpClient())

不要自己new HttpClient，应该让HttpClientFactory管理生命周期和实例化。
因为使用using var httpClient = new HttpClient()，即使对象释放了，底层的连接池也不会立即释放。
微软推荐做法：

public interface  InterfaceType
{

}
public class ImplmentType
{
    private readonly HttpClient _httpClient;
    default ctor(HttpClient httpClient)
    {
        _httpClient = httpClient;
    }
}
// 指定类型
service.AddHttpClient<InterfaceType,ImplmentType>(httpOption => {});

// 指定名称
service.AddHttpClient(name:"HttpClientName",httpOption => {});

// 基本用法
service.AddHttpClient(httpOption => {});

// 依赖注入
public class DemoController : Controller
{
    //指定类型
    ctor(InterfaceType type)

    //指定名称
    private readonly IHttpClientFactory _httpClientFactory;
    ctor(IHttpClientFactory httpClientFactory)
    {
        _httpClientFactory = httpClientFactory;
    }

    public IActionResult DemoAction()
    {
        var httpClient = _httpClientFactory.CreateClient("HttpClientName");
        // todo ...
    }

    //基本用法
    private readonly IHttpClientFactory _httpClientFactory;
    ctor(IHttpClientFactory httpClientFactory)
    {
        _httpClientFactory = httpClientFactory;
    }

    public IActionResult DemoAction()
    {
        var httpClient = _httpClientFactory.CreateClient();
        // todo ...
    }
}