Lofesa commented on issue #1897:
URL: 
https://github.com/apache/incubator-pagespeed-mod/issues/1897#issuecomment-963075582


   >> But nope they're not getting served as webp.
   >> I no longer see the error for http though
   
   And still have the 404?
   Not serves as webp, but are rewrited by pagespeed? The url have pagespeed in 
it? like:
   `xshoes_tennis_bg_eng.png.pagespeed.ic.oIjD0NVeCW.png`
   To serve webp images, the browser must be webp capable, in the request made 
must have a header like:
   `accept: 
text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9`
   If the request donĀ“t have image/web in the accept header, no webp is served.


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