To improve page load performance, some static resources may have some cache control information in their headers.

We can arrange this in the generated web.xml

For now I’ll add the following filters, resulting in any image/css/js to be cached by browsers for at most 7 days after first retrieval.
We only target static content that appear in one of the directories stylesheets, images or javascript, plus the favicon.ico in root.

		  <filter>
		   <filter-name>ExpiresFilter</filter-name>
		   <filter-class>fr.xebia.servlet.filter.ExpiresFilter</filter-class>
		   <init-param>
		      <param-name>ExpiresByType image</param-name>
		      <param-value>access plus 7 days</param-value>
		   </init-param>
		   <init-param>
		      <param-name>ExpiresByType text/css</param-name>
		      <param-value>access plus 7 days</param-value>
		   </init-param>
		   <init-param>
		      <param-name>ExpiresByType application/javascript</param-name>
		      <param-value>access plus 7 days</param-value>
		   </init-param>
		   <!-- backwards compatibility -->
		   <init-param>
		     <param-name>ExpiresByType text/javascript</param-name>
		     <param-value>access plus 7 days</param-value>
		   </init-param>
		  </filter>
		
		  <filter-mapping>
		   <filter-name>ExpiresFilter</filter-name>
		   <url-pattern>/stylesheets/*</url-pattern>
		   <dispatcher>REQUEST</dispatcher>
		  </filter-mapping>
		  <filter-mapping>
		   <filter-name>ExpiresFilter</filter-name>
		   <url-pattern>/javascript/*</url-pattern>
		   <dispatcher>REQUEST</dispatcher>
		  </filter-mapping>
		  <filter-mapping>
		   <filter-name>ExpiresFilter</filter-name>
		   <url-pattern>/images/*</url-pattern>
		   <dispatcher>REQUEST</dispatcher>
		  </filter-mapping>
		  <filter-mapping>
		   <filter-name>ExpiresFilter</filter-name>
		   <url-pattern>/favicon.ico</url-pattern>
		   <dispatcher>REQUEST</dispatcher>
		  </filter-mapping>

Submitted by Elmer van Chastelet on 24 November 2012 at 18:23

Added in rev 5534+5535. Tested on tomcat 6 and 7.