"no such host is known" 在 system.http 中将端点连接到网络 api

Question

我重新格式化了我的电脑，提取了我的项目并试图达到终点。

我有 2 个网络 api，一个 运行 在 localhost:8071，一个在 localhost:8072。

达到 8071 构建和调试就好了。在 localhost:8072 上击中第二个网络 api，我在终点没有击中断点！

打开异常设置后，我只能看到 API 中的一个异常，如下所示。

我得到的错误是 "No such host is found"，它在 System.Private.CoreLib

堆栈跟踪：

   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Net.Http.HttpConnectionPool.CreateConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Net.Http.HttpConnectionPool.WaitForCreatedConnectionAsync(ValueTask`1 creationTask)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.DiagnosticsHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)

完全异常：

-       [0] {System.Net.Http.HttpRequestException: No such host is known ---> System.Net.Sockets.SocketException: No such host is known
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Net.Http.HttpConnectionPool.CreateConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Net.Http.HttpConnectionPool.WaitForCreatedConnectionAsync(ValueTask`1 creationTask)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.DiagnosticsHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)} System.Exception {System.Net.Http.HttpRequestException}

我认识的其他人已经提取了代码并且在加载网络 api 和访问端点时没有任何问题。

全新安装应该可以修复它，所以不确定为什么仍然会发生这种情况。

我是运行.NET core 2.1.

我试过更改端口无济于事。此外，所有防火墙都已关闭。不确定为什么网络 api 项目之一可以达到终点而另一个不能。

谢谢

Answer 1

根本没有涉及自定义中间件。即使在另一个完整格式之后它也没有用。

通过将项目升级到 .NET core 2.2 SDK 设法解决了这个问题。