david187 opened a new issue, #9596:
URL: https://github.com/apache/trafficserver/issues/9596

   ### Reproduction
   
   Master Document Header:
   X-Esi: 1
   etag: W/"xxxxx"
   content-type: text/html; charset=UTF-8
   Cache-Control: max-age=30
   
   ESI sub-document 1 header:
   cache-control: public, max-age=30
   content-type: text/html; charset=UTF-8
   etag: W/"XXXXXX"
   
   ESI sub-document 2 header:
   cache-control: public, max-age=30
   content-type: text/html; charset=UTF-8
   etag: W/"XXXXXX"
   
   ### Final Output header:
   content-type: text/html; charset=UTF-8
   etag: W/"XXXXXX"
   X-Cache-Status: UPDATED
   
   request after 10s
   content-type: text/html; charset=UTF-8
   etag: W/"XXXXXX"
   X-Cache-Status: HIT
   
   so, the caching seem work internally. but the headers are removed.
   ====
   The "Cache-Control" header and "Age" header are removed by ESI module
   
   ### Expected Results
   Final Output header:
   content-type: text/html; charset=UTF-8
   etag: W/"XXXXXX"
   cache-control: public, max-age=30
   Age: 0
   
   and, if request after 10s
   
   content-type: text/html; charset=UTF-8
   etag: W/"XXXXXX"
   cache-control: public, max-age=30
   Age: 10
   
   
   The cahe control / Age header should be keep to let upper layer / client 
cache work.
   
   Here are some code about the max-age header calculation, need addition 
config to make it take effect ?
   
https://github.com/apache/trafficserver/blob/0e9ff8271811a46b46825fe22a272347b64df078/plugins/esi/combo_handler.cc#L266
   
   
   


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