Set Header Expires in .htacess From http://www.paulund.co.uk/set-expire-headers-in-htaccess

.htaccess

# ----------------------------------------------------------------------
# Expires headers (for better cache control)
# ----------------------------------------------------------------------
 
#
# These are pretty far-future expires headers
# They assume you control versioning with cachebusting query params like:
#   <script src="application.js?20100608">
# Additionally, consider that outdated proxies may miscache
#
#   www.stevesouders.com/blog/2008/08/23/revving-filenames-dont-use-querystring/
 
#
# If you don`t use filenames to version, lower the css and js to something like "access plus 1 week"
#
 
<IfModule mod_expires.c>
  ExpiresActive on
 
# Perhaps better to whitelist expires rules? Perhaps.
  ExpiresDefault                          "access plus 1 month"
 
# cache.appcache needs re-requests in FF 3.6 (thx Remy ~Introducing HTML5)
  ExpiresByType text/cache-manifest       "access plus 0 seconds"
 
 
 
# Your document html
  ExpiresByType text/html                 "access plus 0 seconds"
   
# Data
  ExpiresByType text/xml                  "access plus 0 seconds"
  ExpiresByType application/xml           "access plus 0 seconds"
  ExpiresByType application/json          "access plus 0 seconds"
 
# RSS feed
  ExpiresByType application/rss+xml       "access plus 1 hour"
 
# Favicon (cannot be renamed)
  ExpiresByType image/x-icon              "access plus 1 week"
 
# Media: images, video, audio
  ExpiresByType image/gif                 "access plus 1 month"
  ExpiresByType image/png                 "access plus 1 month"
  ExpiresByType image/jpg                 "access plus 1 month"
  ExpiresByType image/jpeg                "access plus 1 month"
  ExpiresByType video/ogg                 "access plus 1 month"
  ExpiresByType audio/ogg                 "access plus 1 month"
  ExpiresByType video/mp4                 "access plus 1 month"
  ExpiresByType video/webm                "access plus 1 month"
   
# HTC files  (css3pie)
  ExpiresByType text/x-component          "access plus 1 month"
   
# Webfonts
  ExpiresByType font/truetype             "access plus 1 month"
  ExpiresByType font/opentype             "access plus 1 month"
  ExpiresByType application/x-font-woff   "access plus 1 month"
  ExpiresByType image/svg+xml             "access plus 1 month"
  ExpiresByType application/vnd.ms-fontobject "access plus 1 month"
     
# CSS and JavaScript
  ExpiresByType text/css                  "access plus 1 year"
  ExpiresByType application/javascript    "access plus 1 year"
  ExpiresByType text/javascript           "access plus 1 year"
   
  <IfModule mod_headers.c>
    Header append Cache-Control "public"
  </IfModule>
   
</IfModule>