How to force Apache to use manually pre-compressed gz file of CSS and JS files?

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Some RewriteRule should handle that quite well.

In a Drupal configuration file I found:

# AddEncoding allows you to have certain browsers uncompress information on the fly.
AddEncoding gzip .gz

#Serve gzip compressed CSS files if they exist and the client accepts gzip.
RewriteCond %{HTTP:Accept-encoding} gzip
RewriteCond %{REQUEST_FILENAME}\.gz -s
RewriteRule ^(.*)\.css $1\.css\.gz [QSA]

# Serve gzip compressed JS files if they exist and the client accepts gzip.
RewriteCond %{HTTP:Accept-encoding} gzip
RewriteCond %{REQUEST_FILENAME}\.gz -s
RewriteRule ^(.*)\.js $1\.js\.gz [QSA]

# Serve correct content types, and prevent mod_deflate double gzip.
RewriteRule \.css\.gz$ - [T=text/css,E=no-gzip:1]
RewriteRule \.js\.gz$ - [T=text/javascript,E=no-gzip:1]

This will make the job. You can put that either in a <Directory foo/> section or in a .htaccess file if you do not have access to apache configuration or if you want to slowdown your webserver.

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