创建电报机器人时出错

Question

我正在使用asp .net Core Web API创建Telegram Bot。我有一个奇怪的例外

  

HttpRequestException：响应状态代码不指示成功：404（未找到）。”

在Startup.cs的Configure方法中

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseMvc();

            Bot.GetBotClientAsync().Wait(); // exception here
// AggregateException: One or more errors occurred. (Response status code does not indicate success: 404 (Not Found).)
        }

这是Bot.cs中我的GetBotClientAsync（）方法

public static async Task<TelegramBotClient> GetBotClientAsync()
        {
            if (botClient != null)
            {
                return botClient;
            }

            commandsList = new List<Command>();
            commandsList.Add(new StartCommand());

            botClient = new TelegramBotClient(AppSettings.Key);
            string hook = string.Format(AppSettings.Url, "api/message/update");
            await botClient.SetWebhookAsync(hook); // also exception here
//HttpRequestException: Response status code does not indicate success: 404 (Not Found).
            return botClient;
        }

我怎么做错了？我该如何解决？