Leverage Browser Caching in .htaccess File

Leverage browser caching

• The following cacheable resources have a short freshness lifetime. Specify an expiration at least one week in the future for the following resources:

With a note of: (expiration not specified)

To deal with this, I added the following to my .htaccess file:

<FilesMatch "\.(ico|jpg|jpeg|png|gif|js|css|swf|woff|ICO|JPG|JPEG|PNG|GIF|JS|CSS|SWF|WOFF)$">
    <IfModule mod_expires.c>
        ExpiresActive on
        ExpiresDefault "access plus 30 days"
    </IfModule>
</FilesMatch>

This is a modified version of what I saw recommended.  The original as I found it was:

<FilesMatch "\.(ico|jpg|jpeg|png|gif|js|css|swf)$">
<IfModule mod_expires.c>
ExpiresActive on
ExpiresDefault "access plus 30 days"
</IfModule>
Header unset ETag
FileETag None
</FilesMatch>

However I had a plugin that added the ‘Header unset ETag’ and ‘FileETag None’ lines.  I found the code here, and you can read up on mod_expires here.  It is good to note that although the message recommends at least 7 days, Google has a  best practices guide found here that recommends 30 days as a minimum.