C# HttpClient抛出意外ThrowForNonSuccess_C#_Asp.net_Async Await_Botframework_Direct Line Botframework

C# HttpClient抛出意外ThrowForNonSuccess

c# asp.net botframework

C# HttpClient抛出意外ThrowForNonSuccess,c#,asp.net,async-await,botframework,direct-line-botframework,C#,Asp.net,Async Await,Botframework,Direct Line Botframework,具有以下与目标框架一起使用的代码.net core 2.2 目标框架4.5存在问题 public async Task<string> GetConversationIdAsync() { try { var client = new HttpClient(); var content = new StringContent(" ", Encoding.UTF8, "application/jso

具有以下与目标框架一起使用的代码.net core 2.2 目标框架4.5存在问题

public async Task<string> GetConversationIdAsync()
    {
        try
        {
            var client = new HttpClient();
            var content = new StringContent(" ", Encoding.UTF8, "application/json");
            client.DefaultRequestHeaders.Accept.Add(
                new MediaTypeWithQualityHeaderValue("application/json"));
            client.DefaultRequestHeaders.Authorization
                = new AuthenticationHeaderValue("Bearer", "XXXXXXXXXXXX");

            var response = await client.PostAsync(
                $"https://directline.botframework.com/v3/directline/conversations", content);///Error here

            var result = await response.Content.ReadAsStringAsync();
            return result;
        }
        catch (Exception ex)
        {

            throw;
        }

    }

但这也不起作用

您不能将内容类型设置为自定义标题，请改为：

webRequest.ContentType = "application/json";

此外，您需要在POST请求中包含内容长度：

string content = " ";
webRequest.ContentLength = content.Length;

之后，您需要写入数据：

  using (var streamWriter = new StreamWriter(webRequest.GetRequestStream()))
            {
                streamWriter.Write(content);
                streamWriter.Flush();
                streamWriter.Close();
            }

如果基础连接关闭，请确保初始化ServicePointManager，它将阻止基础连接关闭：

 public Form1()
        {
             ServicePointManager.Expect100Continue = true;
             ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
             InitializeComponent();
        }

最后我们有一个请求，看起来像这样：

System.Net.WebRequest webRequest = System.Net.WebRequest.Create("https://directline.botframework.com/v3/directline/conversations");
        webRequest.Method = "POST";
        string content = " ";
        webRequest.Headers.Add("Authorization", "Bearer XXXXXXXXXXXXXX");
        webRequest.ContentType = "application/json";
        webRequest.ContentLength = content.Length;
        using (var streamWriter = new StreamWriter(webRequest.GetRequestStream()))
        {
            streamWriter.Write(content);
            streamWriter.Flush();
            streamWriter.Close();
        }
        System.Net.WebResponse resp = webRequest.GetResponse();
        System.IO.StreamReader sr = new System.IO.StreamReader(resp.GetResponseStream());
        string result = sr.ReadToEnd().Trim();
        sr.Close();
        resp.Close();

您只需要使用正确的授权头，否则您将获得

（403）禁止

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