title: Controlling Cache Expirations
body: <p>After running my webpage through Google Webmaster Tools' PageSpeed analyzer, it has reported to me that none of my resources are being cached.  Below is the code in my .htaccess file taken directly from H5BP.  Am I correct in assuming the below expirations are set correctly and something is wrong in my implementation or do I have to set explicit expirations for each file name and not broad generalizations?</p>
  
  <pre><code># ----------------------------------------------------------------------
  # Expires headers (for better cache control)
  # ----------------------------------------------------------------------
  
  # These are pretty far-future expires headers.
  # They assume you control versioning with filename-based cache busting
  # Additionally, consider that outdated proxies may miscache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".
  
  &lt;IfModule mod_expires.c&gt;
    ExpiresActive on
  
  # Perhaps better to whitelist expires rules? Perhaps.
    ExpiresDefault                          "access plus 1 month"
  
  # cache.appcache needs re-requests in FF 3.6 (thanks Remy ~Introducing HTML5)
    ExpiresByType text/cache-manifest       "access plus 0 seconds"
  
  # Your document html
    ExpiresByType text/html                 "access plus 0 seconds"
  
  # Data
    ExpiresByType application/json          "access plus 0 seconds"
    ExpiresByType application/xml           "access plus 0 seconds"
    ExpiresByType text/xml                  "access plus 0 seconds"
  
  # Feed
    ExpiresByType application/atom+xml      "access plus 1 hour"
    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 audio/ogg                 "access plus 1 month"
    ExpiresByType image/gif                 "access plus 1 month"
    ExpiresByType image/jpeg                "access plus 1 month"
    ExpiresByType image/png                 "access plus 1 month"
    ExpiresByType video/mp4                 "access plus 1 month"
    ExpiresByType video/ogg                 "access plus 1 month"
    ExpiresByType video/webm                "access plus 1 month"
  
  # HTC files  (css3pie)
    ExpiresByType text/x-component          "access plus 1 month"
  
  # Webfonts
    ExpiresByType application/vnd.ms-fontobject "access plus 1 month"
    ExpiresByType application/x-font-ttf    "access plus 1 month"
    ExpiresByType application/x-font-woff   "access plus 1 month"
    ExpiresByType font/opentype             "access plus 1 month"
    ExpiresByType image/svg+xml             "access plus 1 month"
  
  # CSS and JavaScript
    ExpiresByType application/javascript    "access plus 1 year"
    ExpiresByType text/css                  "access plus 1 year"
  
  &lt;/IfModule&gt;
  </code></pre>