XF 1.5 adding expire headers to attachments

Hey guys I have a few attachments displayed on the front page that usually won't change.
I would like to add expire headers to improve the overall speed of my board.

If I test my site via gtmetrix I get this:

There are 4 static components without a far-future expiration date.

Adding this doesn't make any difference :

Code:
<IfModule mod_expires.c>
    ExpiresActive On
    ExpiresDefault "access plus 1 seconds"
    ExpiresByType text/html "access plus 1 seconds"
    ExpiresByType image/gif "access plus 3456000 seconds"
    ExpiresByType image/jpeg "access plus 3456000 seconds"
    ExpiresByType image/png "access plus 3456000 seconds"
    ExpiresByType text/css "access plus 3456000 seconds"
    ExpiresByType text/javascript "access plus 3456000 seconds"
    ExpiresByType application/javascript "access plus 3456000 seconds"
    ExpiresByType application/x-javascript "access plus 3456000 seconds"
</IfModule>

I would appreciate any input.
 
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