Does caching images with servlet work?

I used a solution for caching images that founded here http://ift.tt/1AWEUpv

    <filter>
        <filter-name>CacheControl</filter-name>
        <filter-class>filters.CacheControlFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>CacheControl</filter-name>
        <url-pattern>*.jpg</url-pattern>
        <url-pattern>*.jpeg</url-pattern>
        <url-pattern>*.png</url-pattern>
        <url-pattern>*.gif</url-pattern>
    </filter-mapping>

But seems it does not work, because every time page opens the image reloading. For example http://ift.tt/1zFCsyI

Does caching realy work?