Removing Cache Busting in Rails Production

set :normalize_asset_timestamps, false

#Etags should be based on the file parameters only (default includes INode)
FileETag MTime Size

#Rewrite stuff
RewriteEngine On

#This sets the environment variable (is_versioned) when the URL query string
#looks like ?874353948543  or any string of digits
RewriteCond %{QUERY_STRING} ^[0-9]+$
RewriteRule ^(.*)$ $1 [env=is_versioned:true]

<Directory /deployed-rails-app/public/ >
    Options -Indexes FollowSymLinks -MultiViews
    AllowOverride None
    Order allow,deny
    allow from all

    #For files, force the browser to rely on cache-control directives and
    #Rails asset timestamps by removing Etags and Last-Modified dates

    #For all assets that aren't stamped by rails, cache them for ~ 3 hours
    Header set "Cache-Control" "max-age=10000"
    Header unset Etag
    Header unset "Last-Modified"

    #For all assets that ARE stamped by rails, cache them for 30 days
    Header set "Cache-Control" "max-age=2592000" env=is_versioned

</Directory>