Re: [I] Dubbo 3.2.1协议端口复用，consumer端报错 [dubbo]

Sun, 19 Nov 2023 23:25:28 -0800 


iJIAJIA commented on issue #12344:
URL: https://github.com/apache/dubbo/issues/12344#issuecomment-1818369252

   @AlbumenJ 
   我们也碰到这个问题. 
   
   具体原因已经定位到了:
   triple协议调用超时, 
主要是首次连接请求时org.apache.dubbo.remoting.transport.netty4.NettyPortUnificationServerHandler#decode
   进行协议检测的逻辑问题.
   WirProtocol目前有4个实现, 其中 
GrpcHttp2Protocol和TriHttp2Protocol都使用的Http2ProtocolDetector 进行的协议检测.
   dubbo进行spi加载时, GrpcHttp2Protocol先于TriHttp2Protocol, 
故所有tri协议都会被识别为GrpcHttp2Protocol.
   
   NettyPortUnificationServerHandler在识别到协议后, 会基于实际的协议重新构造localUrl,  
   `java
   // 这里因为获取到的protocolName是grpc,  故返回的是默认的url, 即dubbo://
   URL localURL = this.urlMapper.getOrDefault(protocolName, url);
   `
   后续在执行NettyConfigOperator时, 会因为是dubbo协议, 多了两个dubbo的ChannelHandler.
   
![image](https://github.com/apache/dubbo/assets/10057108/2ad73596-d3ce-43b4-94cb-c6ba06b4f04f)
   
   


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