如何在asp.net中发送http请求而无需等待响应并且不占用资源

using System;
using System.Net.Http;
using System.Threading.Tasks;

public class HttpRequestHelper
{
    private static readonly HttpClient _httpClient = new HttpClient();

    public static async Task SendAsync(string url)
    {
        await _httpClient.GetAsync(url);
    }
}