等待HttpClient.PostAsync响应时，我有时会看到错误，指出＆＃34;服务器返回了无效或无法识别的响应＆＃34;：
System.Net.Http.HttpRequestException: An error occurred while sending the request. —> System.Net.Http.WinHttpException: The server returned an invalid or unrecognized response
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
at System.Net.Http.WinHttpHandler.d__105.MoveNext()
— End of inner exception stack trace —
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
at System.Net.Http.HttpClient.d__58.MoveNext()
这是一个非常神秘的错误;我想我可以设想一个＆＃34;无效＆＃34;响应可能是(即语法无效的HTTP响应，如直接跳转到没有状态行的标题的响应)，但实际上是什么＆＃34;无法识别＆＃34;响应HTTP请求？这条消息似乎是胡说八道。
什么情况下实际上可以触发这个错误？