html - How to Specify a Vary: Accept-Encoding header? -


google , pingdom.com says should "specify vary: accept-encoding header"

i not know or understand how this. can explain , does?

i getting 100% score in https://tools.pingdom.com/ , https://developers.google.com/speed/pagespeed/insights/

i found helpful post speed wordpress website or blog https://www.keycdn.com/blog/speed-up-wordpress/

with other optimizations, using below code on site in .htaccess file (usually hidden in main website folder)

my server apache, can check in hosting control panel (like cpanel/whm panel)(if server nginx check keycdn.com post)

(copy , paste below code in .htaccess file, it's working me)

(upvote answer if works you)

<ifmodule mod_expires.c> expiresactive on expiresbytype image/jpg "access 1 month" expiresbytype image/jpeg "access 1 month" expiresbytype image/gif "access 1 month" expiresbytype image/png "access 1 month" expiresbytype image/svg "access 1 month" expiresbytype text/css "access 1 month" expiresbytype text/html "access 1 month" expiresbytype application/pdf "access 1 month" expiresbytype text/x-javascript "access 1 month" expiresbytype text/javascript "access 1 month" expiresbytype application/javascript "access 1 month" expiresbytype application/xhtml+xml "access 1 month" expiresbytype application/x-shockwave-flash "access 1 month" expiresbytype image/x-icon "access 1 month" expiresdefault "access 1 month" </ifmodule>  <ifmodule mod_headers.c>   <filesmatch ".(css|jpg|jpeg|png|gif|swf|svg|js|ico)$">     header set cache-control "max-age=2592000, public"   </filesmatch>   <filesmatch ".(x?html?|php)$">     header set cache-control "private, must-revalidate"   </filesmatch> </ifmodule>  <ifmodule mod_deflate.c>   # compress html, css, javascript, text, xml , fonts   addoutputfilterbytype deflate application/javascript   addoutputfilterbytype deflate application/json   addoutputfilterbytype deflate application/atom+xml   addoutputfilterbytype deflate application/rdf+xml   addoutputfilterbytype deflate application/rss+xml   addoutputfilterbytype deflate application/vnd.ms-fontobject   addoutputfilterbytype deflate application/x-font   addoutputfilterbytype deflate application/x-font-opentype   addoutputfilterbytype deflate application/x-font-otf   addoutputfilterbytype deflate application/x-font-truetype   addoutputfilterbytype deflate application/x-font-ttf   addoutputfilterbytype deflate application/x-font-woff   addoutputfilterbytype deflate application/x-javascript   addoutputfilterbytype deflate application/xhtml+xml   addoutputfilterbytype deflate application/xml   addoutputfilterbytype deflate font/opentype   addoutputfilterbytype deflate font/otf   addoutputfilterbytype deflate font/truetype   addoutputfilterbytype deflate font/ttf   addoutputfilterbytype deflate image/svg+xml   addoutputfilterbytype deflate image/x-icon   addoutputfilterbytype deflate text/css   addoutputfilterbytype deflate text/html   addoutputfilterbytype deflate text/javascript   addoutputfilterbytype deflate text/plain   addoutputfilterbytype deflate text/xml </ifmodule>

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