bringwu commented on issue #13666:
URL: https://github.com/apache/dubbo/issues/13666#issuecomment-1923834106

   > @bringwu In your demo, Dubbo process the result before set attachment.
   > 
   > 
![image](https://private-user-images.githubusercontent.com/9292748/301764830-9f91d080-8889-44e9-8c71-3db4eb519512.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.BZoAXjc-cc0Be9lL0XP3RocP4qY3HRglrIg2-q2Ynh8)
 Add sleep before return to make sure that 
`serverResponseContext.setAttachment("tokenInfo", token)` has been processed.
   > 
   > 
![image](https://private-user-images.githubusercontent.com/9292748/301765031-5c47206d-628f-4aa6-8a48-ab20b2ef0e6a.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MDY4ODE1NDQsIm5iZiI6MTcwNjg4MTI0NCwicGF0aCI6Ii85MjkyNzQ4LzMwMTc2NTAzMS01YzQ3MjA2ZC02MjhmLTRhYTYtOGE0OC1hYjIwYjJlZjBlNmEucG5nP1gtQW16LUFsZ29yaXRobT1BV1M0LUhNQUMtU0hBMjU2JlgtQW16LUNyZWRlbnRpYWw9QUtJQVZDT0RZTFNBNTNQUUs0WkElMkYyMDI0MDIwMiUyRnVzLWVhc3QtMSUyRnMzJTJGYXdzNF9yZXF1ZXN0JlgtQW16LURhdGU9MjAyNDAyMDJUMTM0MDQ0WiZYLUFtei1FeHBpcmVzPTMwMCZYLUFtei1TaWduYXR1cmU9ZTgyZmI2MmM2YmM0NGVhMGE5NDllZTJlNzk3NjhiMTk5YzdhNjYyODY3NWMxYzE5ZGJhODBjNTJjMjM2NGMwYiZYLUFtei1TaWduZWRIZWFkZXJzPWhvc3QmYWN0b3JfaWQ9MCZrZXlfaWQ9MCZyZXBvX2lkPTAifQ.gK2hlXH_icaxVzdilVl8wK9zoAFsW9wXVdM3RALjkE0)
 Then it work.
   
   Adding sleep can make an asynchronous program behave synchronously, but it 
can lead to performance issues. I think Dubbo should optimize this problem to 
allow programs to execute purely asynchronously.
   


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