I've inserted the following directives in my htaccess
Is it "correct"?
<IfModule mod_headers.c>
ExpiresActive On
ExpiresDefault "access plus 1 year"
</IfModule>
FileETag None
<FilesMatch "\.(ico|gz|JPG|jpg|jpeg|png|gif|js|css|swf)$">
Header unset Cache-control
Header set Expires "Wed, 28 Apr 2013 20:00:00 GMT"
</FilesMatch>