ExpiresActive On
<FilesMatch "\.(ico|pdf|flv|jpg|jpeg|png|gif|js|css|ai|eps|psd|zip)$">
  # Only need to set one of etag OR last-modified. Go with last-modified
  # as recommended by Google Page Speed.
  FileETag None

  # If Last-Modified is sufficiently far back chances are browser will not
  # refetch asset (Google Page Speed).
  Header set Last-Modified "Mon, 10 Jan 2005 10:00:00 GMT"

  # Set Cache-Control to public, this will overwrite the max-age header
  # set by ExpiresDefault (max-age AND Expires are not both needed according
  # to Google Page Speed). Public cache-control means proxies may cache static
  # assets, also allows Firefox to cache assets over SSL.
  Header set Cache-Control "public"

  # Deliberately set to almost a year, just in case some weirdness could ever
  # happen if we slightly exceeded a year due to time zone inconsistencies.
  ExpiresDefault "now plus 51 weeks"
</FilesMatch>

<FilesMatch "favicon\.ico$">
  # Treat favicon.ico bit differently as some browsers may not use the favicon
  # fingerprinted path given in the page head tag.
  ExpiresDefault "now plus 1 month"
</FilesMatch>