@lllichen 我分析不出会有那种协议会走到[https://github.com/apache/incubator-dubbo/blob/master/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/support/header/HeaderExchangeHandler.java#L204](https://github.com/apache/incubator-dubbo/blob/master/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/support/header/HeaderExchangeHandler.java#L204)这段代码中去，麻烦一起解惑。
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