masaori335 opened a new pull request, #12241:
URL: https://github.com/apache/trafficserver/pull/12241

   This clarifies behavior of `proxy.config.http.cache.max_stale_age` config. 
   
   For now, `HttpTransact::is_stale_cache_response_returnable` simply compares 
`current_age` and `max_stale_age` config. The problem is if `max_stale_age` is 
shorter than `max-age`, ATS can't serve stale contents as expected.
   
   <img width="727" alt="Screenshot 2025-05-13 at 11 27 46" 
src="https://github.com/user-attachments/assets/1c17e44e-735a-45ea-91ae-731ef2b53051";
 />
   
   It's discussable this is a bug fix or incompatible config change.
   
   /cc @mlibbey 


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