向 bot 发送消息时连接意外关闭 api

Question

我们的 C# 应用程序使用电报机器人 API 向使用 SendTextMessageAsync 的大量订阅者发送大量消息。

    await _client.SendTextMessageAsync(
                        telegramChatId,
                        message,
                        parseMode: ParseMode.Html,
                        replyMarkup: keyboard,
                        disableWebPagePreview: disableWebPagePreview,
                        disableNotification: disableNotification
                    );

到目前为止一切正常。但最近我们开始为某些请求获得此异常：

The underlying connection was closed: The connection was closed unexpectedly.

或

The underlying connection was closed: A connection that was expected to be kept alive was closed by the server.

异常消息没有提供任何有关原因的线索。有没有办法让 visual studio 显示更多细节！？该程序会一直运行，直到发送了大约 400 个第一个请求。由于请求数超过 400，它在尝试发出请求时引发了该异常。此外，请求之间有一秒的延迟，因此我们不会得到 TooManyRequest 异常。无论我们重试多少次发送请求。我会一次又一次地得到同样的错误。

这是异常的堆栈跟踪：

at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar)

这是一个异常堆栈跟踪：

at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Net.Http.HttpClient.<FinishSendAsyncBuffered>d__58.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Telegram.Bot.TelegramBotClient.<MakeRequestAsync>d__54`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at MelkRadar.Core.Service.Telegram.Common.TelegramBot`1.<>c__DisplayClass19_0.<<SendTextMessageAsync>b__0>d.MoveNext() in C:\Repos\MelkRadar\src\MelkRadar\Core\MelkRadar.Core.Service\Telegram\Common\TelegramBot.cs:line 113
 --- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Polly.Policy.<>c__DisplayClass181_0`1.<<ExecuteAsyncInternal>b__0>d.MoveNext() in C:\projects\polly\src\Polly.Shared\Policy.Async.cs:line 0
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Polly.RetrySyntaxAsync.<>c__DisplayClass25_1.<<WaitAndRetryAsync>b__1>d.MoveNext() in C:\projects\polly\src\Polly.Shared\Retry\RetrySyntaxAsync.cs:line 545
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Polly.Retry.RetryEngine.<ImplementationAsync>d__1`1.MoveNext() in C:\projects\polly\src\Polly.Shared\Retry\RetryEngineAsync.cs:line 29

谁能帮我解决这个问题？提前致谢。

Answer 1

当我停止我的 VPN 时，问题就解决了！我不知道它如何真正影响我的请求以及电报服务器和我的应用程序之间的连接。但问题似乎是由 VPN 引起的。

向 bot 发送消息时连接意外关闭 api

The connection was closed unexpectedly error in sending message to bot api

c#

telegram

telegram-bot