ioweb-gr commented on issue #1897:
URL: 
https://github.com/apache/incubator-pagespeed-mod/issues/1897#issuecomment-968974811


   I myself read the Varnish article and I wanted to note that I'm not using 
varnish. Just nginx as reverse proxy to apache. 
   
   Regarding the headers for the url I'm viewing request headers are 
   
   ```
   HTTP/2 200 OK
   server: nginx
   content-type: text/html; charset=UTF-8
   x-powered-by: PHP/7.4.25
   x-magento-cache-control: max-age=86400, public, s-maxage=86400
   x-magento-tags: 
cat_c,cat_c_3,cat_c_49,cat_c_7,cat_c_12,cat_c_54,cat_c_61,cat_c_372,cat_c_853,cat_c_1014,store,cms_b,cms_b_footer-all,cat_c_p_54,cat_p_129993,cat_p,cat_p_129500,cat_p_119921,cat_p_121195,cat_p_118932,cat_p_118933,cat_p_118994,cat_p_118930,cat_p_118931,cat_p_118993,cat_p_119207,cat_p_113823,cat_p_111868,cat_p_98893,cat_p_96700,cat_p_96036,cat_p_96045,cat_p_96697,cat_p_96702,cat_p_96635,cat_p_96634,cat_p_96159,cat_p_96160,cat_p_96203,cat_p_96204,cat_p_96633,cat_p_99173,cat_p_94689,cat_p_107512,cat_p_93850,cat_p_93851,cat_p_91606,cat_p_108936,cat_p_90454,cat_p_82292,cat_p_76719,cat_p_74920,cat_p_71801,cat_p_128314,cat_p_92152,cat_p_71803,cat_p_128313,cat_p_101999,cat_p_66737,cat_p_66740,cat_p_66741,cat_p_62604,cat_p_61869,cat_p_98220,cat_p_98215,cat_p_53191,cat_p_52704,cat_p_52191,cat_p_54570,cat_p_52692,cat_p_49621,cat_p_49716,cat_p_49021,cat_p_49024,mobile,amasty_mega_menu,cms_b_etennis_greek_header_custom_block,cms_b_porto_category_side_custom_block,cms_b_porto_foo
 ter_bottom_custom_block,FPC
   pragma: no-cache
   x-magento-cache-debug: HIT
   x-content-type-options: nosniff
   x-xss-protection: 1; mode=block
   x-frame-options: SAMEORIGIN
   set-cookie: PHPSESSID=lub80ttmofa7l5cn2itrh7kecb; expires=Mon, 15-Nov-2021 
15:30:07 GMT; Max-Age=3600; path=/; domain=subdomain.example.com; secure; 
HttpOnly; SameSite=None
   set-cookie: X-Magento-Vary=c58cc7336841735bf5ef13185766282824a9d073; 
expires=Mon, 15-Nov-2021 15:30:07 GMT; Max-Age=3600; path=/; secure; HttpOnly; 
SameSite=None
   x-ua-compatible: IE=edge
   strict-transport-security: max-age=15768000; includeSubDomains
   x-powered-by: PleskLin
   date: Mon, 15 Nov 2021 14:30:07 GMT
   x-page-speed: 1.13.35.2-0
   cache-control: max-age=0, no-cache, no-store
   X-Firefox-Spdy: h2
   ```
   
   I'm pretty sure cache-control header is sent by magento 2 itself without 
varnish.
   
   But we don't really want to cache the full pages themselves in the browser, 
we just need to serve optimized images and cache the static assets. That's why 
we add expires headers for images for example.
   
   Could you explain to me how the cache-control in the main page is 
interfering with pagespeed?
   
   ` x-magento-cache-control and x-magento-cache-debug headers` are there 
because this is a staging site in developer mode. They go away in production. 
   


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