Lofesa commented on issue #1681: Uncacheable content, preventing rewriting of 
image
URL: 
https://github.com/apache/incubator-pagespeed-ngx/issues/1681#issuecomment-594475876
 
 
   I´m getting the webp images again. 
   Maybe is for the sort time in cache-control header. 3600 = 1h. This makes 
that every hour, the assets get not optimized and need some hist to get it 
again.
   
   In the home page I still egtting the 2 cache-control headers.
   ```
   Cache-Control: no-cache, must-revalidate, max-age=0
   Cache-Control: max-age=3600, public, s-maxage=10
   
   ```
   You nee to found where the no-cache... is added and supress it.
   
   
   I forgot before comment on this:
   Yes you can use ExpiresByType for file types. But now, you have all 
resources with a cache-control= 3600, so maybe you have a `header set`  in 
place and that averrides the ExpiresByType.
   If you use the config set in you 
[comment](https://github.com/apache/incubator-pagespeed-ngx/issues/1681#issuecomment-593888538)
 add a  
   
   ExpiresByType text/html "some time you consider but make it cacheable"
   

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