belgattitude/openstore/master/data/media/preview/.htaccess

<FilesMatch ".(gif|png|jpg)$">
    # Cached for 10 minutes max
    #Header set Cache-Control "max-age=60, public"
    # Danger with cache
    # Cached forever
    Header set Expires "Thu, 16 Apr 2020 20:00:00 GMT"
    Header unset Last-Modified
    Header unset ETag
    FileETag None 
    Header add Access-Control-Allow-Origin "*" 

</FilesMatch>

On Github License