carryxyh commented on issue #2321: Does provider "async = true" need to be 
remove from url when register to registry?
URL: 
https://github.com/apache/incubator-dubbo/issues/2321#issuecomment-419828360
 
 
   Hi, @diecui1202 
   I checked the code. On 2.6.x, method.async is also passed to the Consumer 
side.
   If you just ignore the method.async from the Provider side on the Consumer 
side (as my pr does), update and start the Provider first, then the 
method.async will still pass through to the Consumer and affect the Consumer's 
behavior.
   
   Therefore, for compatibility reasons, it is necessary to fix the problem on 
the Provider side so that method.async is not registered to the registry.
   
   In the Consumer, ignoring the Provider's method.async is equivalent to an 
insurance, ensuring that the Provider's method.async will not affect the 
Consumer's behavior under any circumstances.

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