    Add Expires headers
    There are 21 static components without a far-future expiration date.
    
        http://static.doers.lk/examples-offline.css
        http://static.doers.lk/kendo.common.min.css
        http://static.doers.lk/kendo.default.min.css
        http://static.doers.lk/style.css
        http://static.doers.lk/jquery.min.js
        http://static.doers.lk/kendo.web.min.js
        http://static.doers.lk/console.js
        http://static.doers.lk/sprite.png
        https://fbexternal-a.akamaihd.net/safe_image.php?...
        https://fbexternal-a.akamaihd.net/safe_image.php?...
        https://fbexternal-a.akamaihd.net/safe_image.php?...
        https://fbexternal-a.akamaihd.net/safe_image.php?...
        https://fbexternal-a.akamaihd.net/safe_image.php?...
        https://fbexternal-a.akamaihd.net/safe_image.php?...
        https://fbexternal-a.akamaihd.net/safe_image.php?...
        https://fbexternal-a.akamaihd.net/safe_image.php?...
        https://fbexternal-a.akamaihd.net/safe_image.php?...
        https://fbexternal-a.akamaihd.net/safe_image.php?...
        https://fbexternal-a.akamaihd.net/safe_image.php?...
        https://fbexternal-a.akamaihd.net/safe_image.php?...
        http://static.doers.lk/favicon.PNG

When testing the site using yahoo YSLOW it says above message. So I don&#39;t know how to add expire headers. Any help would be appreciated?

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Add Expires headers