[GitHub] [skywalking] zhaoyuguang opened a new pull request #3445: Gateway compatible with downstream loss

[GitBox]

zhaoyuguang opened a new pull request #3445: Gateway compatible with downstream 
loss
URL: https://github.com/apache/skywalking/pull/3445
 
 
   Please answer these questions before submitting pull request
   
   - Why submit this pull request?
   - [x] Bug fix
   - [ ] New feature provided
   - [ ] Improve performance
   
   - Related issues
   https://github.com/apache/skywalking/issues/3428
   
   ___
   ### Bug fix
   - Bug description.
   When the downstream is lost, the reactor-netty interceptor won't work, but 
the NettyRoutingFilterInterceptor has do `prepareForAsync` and `stopSpan`
   
![image](https://user-images.githubusercontent.com/10150229/64524069-5afe0a80-d330-11e9-987f-8c7ccd6fc7d0.png)
   
   - How to fix?
   At `AbstractServerResponseMethodInterceptor` if ServerWebExchange has span 
and ContextManager get == null, use span.asyncFinish() to report it to backend
   

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