.net c# GET請求 One or more errors occurred.The SSL connection could not be established

請求的地址 url 是http 還是https   是不一樣的

這個是http 的請求方法   如果你要請求https   可以修改被調用的接口  右鍵 項目->屬性->調試 web服務器設置  增加一個 http     示例:  https://localhost:5001;http://localhost:5000

public static string SendRequestGet(string HttpUrl)
        {
            HttpClient _HttpClient = new HttpClient();
            _HttpClient.BaseAddress = new Uri(HttpUrl);
            _HttpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            _HttpClient.DefaultRequestHeaders.AcceptEncoding.Add(new StringWithQualityHeaderValue("utf-8"));
            var respon = _HttpClient.GetAsync(HttpUrl);
            return respon.Result.Content.ReadAsStringAsync().Result;
        }