问题描述
使用Azure Relay服务，可以帮助服务器与客户端无法直接访问的情况下，提供牵线搭桥中转的沟通方式，俗称“中继”。
它是一种单对单的通信方式，需要对服务端和客户端代码有一些改动才可以，需要定义服务端侦听器(Listener)来接受消息，客户端(Caller)来发送消息。
- 服务端侦听器(Listener)： 使用 HybridConnectionListener 对象来初始化对象
- 客户端发送者(Caller)：使用 HybridConnectionClient 对象来初始化对象
Azure Relay的工作原理如下
原理图：
流程说明：
- Listening client sends a listening request to the Azure Relay service. The Azure load balancer routes the request to one of the gateway nodes.
- The Azure Relay service creates a relay in the gateway store.
- Sending client sends a request to connect to the listening service.
- The gateway that receives the request looks up for the relay in the gateway store.
- The gateway forwards the connection request to the right gateway mentioned in the gateway store.
- The gateway sends a request to the listening client for it to create a temporary channel to the gateway node that's closest to the sending client.
- The listening client creates a temporary channel to the gateway that's closest to the sending client. Now that the connection is established between clients via a gateway, the clients can exchange messages with each other.
- The gateway forwards any messages from the listening client to the sending client.
- The gateway forwards any messages from the sending client to the listening client.
基于以上的理解，当Listener 或 Caller 都突然中断的时候， Listener端会记录什么异常日志呢？Caller端会记录什么异常日志呢？
问题解答
第一部分：Caller端异常退出的情况， Listener会记录什么日志呢？
结果
在Listener的日志中，会输出如下的错误消息。
如果不对异常进行处理，会导致整个进程奔溃，Listener退出。
Exception in processing connection:
Microsoft.Azure.Relay.RelayException: The remote party closed the WebSocket connection without completing the close handshake.
TrackingId:xxx-xx-xx-xx-xxxx4_G8_G9,
Address:sb://xxxxxxxx.servicebus.chinacloudapi.cn/xxxxxxxt01,
Timestamp:5/17/2026 8:48:56 AM
---> System.Net.WebSockets.WebSocketException: The remote party closed the WebSocket connection without completing the close handshake.
at System.Net.WebSockets.WebSocketBase.WebSocketOperation.<Process>d__19.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Net.WebSockets.WebSocketBase.<ReceiveAsyncCore>d__45.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
实验
分别启动Listener 和 Caller，在正常通信两次后，直接关闭Caller窗口
第二部分：Listener端异常退出的情况， Caller会记录什么日志呢？
结果
在Caller的日志中，会输出如下的错误消息。
Microsoft.Azure.Relay.RelayException:
The remote party closed the WebSocket connection without completing the close handshake.
TrackingId:xxxx-x-x-xx-xxxx5e79e2e,
Address:sb://xxxxxx.servicebus.chinacloudapi.cn/xxxxxxst01, Timestamp:5/17/2026 9:29:11 AM
---> System.Net.WebSockets.WebSocketException: The remote party closed the WebSocket connection without completing the close handshake.
at System.Net.WebSockets.WebSocketBase.WebSocketOperation.<Process>d__19.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Net.WebSockets.WebSocketBase.<ReceiveAsyncCore>d__45.MoveNext()
实验
分别启动Listener 和 Caller，在正常通信后，直接关闭Listener窗口
对比两种情况下的日志，都是 Microsoft.Azure.Relay.RelayException: The remote party closed the WebSocket connection without completing the close handshake.
微小的区别在异常消息中的TrackingId格式不同：
- 如果是Caller异常断开，TrackingId中会携带 _GX_GX 标识，比如： TrackingId:xxx-xx-xx-xx-xxxx4_G8_G9
- 如果是Listener异常断开，TrackingId中不会携带，它的值就是普通的guid字符串，如TrackingId:xxx-xx-xx-xx-xxxxxx0a5
以上内容，供您参考。
参考资料
什么是 Azure 中继？https://docs.azure.cn/zh-cn/azure-relay/relay-what-is-it
开始在 .NET 中使用中继混合连接 WebSocket : https://docs.azure.cn/zh-cn/azure-relay/relay-hybrid-connections-dotnet-get-started
当在复杂的环境中面临问题，格物之道需：浊而静之徐清，安以动之徐生。 云中，恰是如此!
