[GitHub] jasonjoo2010 opened a new issue #2174: dubbo 2.6.3 is not compatible with dubbo >= 2.5.9

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jasonjoo2010 opened a new issue #2174: dubbo 2.6.3 is not compatible with dubbo >= 2.5.9
URL: https://github.com/apache/incubator-dubbo/issues/2174
 
 
   - [X] I have searched the [issues](https://github.com/apache/incubator-dubbo/issues) of this repository and believe that this is not a duplicate.
   - [X] I have checked the [FAQ](https://github.com/apache/incubator-dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.
   
   ### Environment
   
   * Dubbo version: 2.5.9~2.5.10
   * Operating System version: any
   * Java version: any
   
   ### Step to reproduce this issue
   
   response with attachments is a new feature in release 2.6.3.
   
   but its compatible versions are set to ![2.0.10 ~ 2.6.2] while the "ProtocolVersion" had bean changed to 2.0.1 (implementation version) and 2.0.0 (specification version).
   
   the priority of "implementation version" is greater than other in Version.getVersion.
   
   this will cause dubbo rpc request failing from >2.5.9 to 2.6.3.
   
   So is that a good idea to upgrade the lowest protocol version of attachment-feature to 2.0.2?
   
   it's a big problem
   
   ### Expected Result
   
   compatible
   
   ### Actual Result
   
   fail
   
   

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