How to Specify Vary Accept-Encoding header in htaccess

Question

Google PageSpeed says I should  Specify a Vary  Accept-Encoding header  for JS and CSS  How do I do this in  htaccess

User · Answer

Many hours spent to clarify what was that. Please, read this post to get the advanced .HTACCESS codes and learn what they do.

You can use:

Header append Vary "Accept-Encoding"
#or
Header set Vary "Accept-Encoding"

User · Answer

if anyone needs this for NGINX configuration file here is the snippet   location       js css xml gz         add header Vary  Accept-Encoding            other headers or rules

User · Answer

I m afraid Aularon didn t provide enough steps to complete the process  With a little trial and error  I was able to successfully enable Gzipping on my dedicated WHM server   Below are the steps    Run EasyApache within WHM  select Deflate within the Exhaustive Options list  and rebuild the server  Once done  goto Services Configuration    Apache Configuration    Include Editor    Post VirtualHost Include  select All Versions  and then paste the mod headers c and mod headers c code  listed above in Aularon s post  on top of on another within the input field  Once saved  I was seeing a 75 36  data savings on average  You can run a before and after test by using this HTTP Compression tool to see your own results  http   www whatsmyip org http compression    Hope this works for you all    Matt

User · Answer

To gzip up your font files as well   add  x-font otf x-font ttf x-font eot    as in   AddOutputFilterByType DEFLATE text html text plain text xml application xml x-font otf x-font ttf x-font eot

User · Answer

No need to specify or even check if the file is has compressed  you can send it to every file  On every request      It tells downstream proxies how to match future request headers to decide   whether the cached response can be used rather than requesting a fresh   one from the origin server     lt ifModule mod headers c gt    Header unset Vary   Header set Vary  Accept-Encoding  X-HTTP-Method-Override  X-Forwarded-For  Remote-Address  X-Real-IP  X-Forwarded-Proto  X-Forwarded-Host  X-Forwarded-Port  X-Forwarded-Server   lt  ifModule gt     the unset is to fix some bugs in older GoDaddy hosting  optionally

User · Answer

I guess it s meant that you enable gzip compression for your css and js files  because that will enable the client to receive both gzip-encoded content and a plain content   This is how to do it in apache2    lt IfModule mod deflate c gt       The following line is enough for  js and  css     AddOutputFilter DEFLATE js css       The following line also enables compression by file content type  for the following list of Content-Type s     AddOutputFilterByType DEFLATE text html text plain text xml application xml       The following lines are to avoid bugs with some browsers     BrowserMatch  Mozilla 4 gzip-only-text html     BrowserMatch  Mozilla 4  0 678  no-gzip     BrowserMatch  bMSIE  no-gzip  gzip-only-text html   lt  IfModule gt    And here s how to add the Vary Accept-Encoding header   src    lt IfModule mod headers c gt     lt FilesMatch     js css xml gz    gt      Header append Vary  Accept-Encoding    lt  FilesMatch gt   lt  IfModule gt    The Vary  header tells the that the content served for this url will vary according to the value of a certain request header  Here it says that it will serve different content for clients who say they Accept-Encoding  gzip  deflate  a request header   than the content served to clients that do not send this header  The main advantage of this  AFAIK  is to let intermediate caching proxies know they need to have two different versions of the same url because of such change

User · Answer

This was driving me crazy  but it seems that aularon s edit was missing the colon after  Vary   So changing  Vary Accept-Encoding  to  Vary  Accept-Encoding  fixed the issue for me     I would have commented below the post  but it doesn t seem like it will let me    Anyhow  I hope this saves someone the same trouble I was having

[.htaccess] How to Specify "Vary: Accept-Encoding" header in .htaccess

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