Caching MIME types in browser using a servlet (independent of the app-code)

Question

We are using jboss 3.2.6 app server to deploy an ear. To reduce the server round-trips and network latency, we created a servlet that caches various MIME types in the browser.
package foo.bar.nw.cache;
import java.io.IOException;
import javax.naming.directory.DirContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.catalina.servlets.DefaultServlet;
public class TomcatDefaultServlet extends DefaultServlet {
     protected void serveResource(HttpServletRequest request,
               HttpServletResponse response, boolean content) throws IOException,
               ServletException {
          super.serveResource(request, response, content);
          DirContext resources = getResources();
          String path = getRelativePath(request);
          ResourceInfo resourceInfo = new ResourceInfo(path, resources);
          String mimeType = getServletContext().getMimeType(resourceInfo.path);
          System.out.println("mime type = " + mimeType);
          if (mimeType != null
                    && (mimeType.equals("image/gif")
                              || mimeType.equals("text/javascript")
                              || mimeType.equals("image/jpeg") || mimeType
                              .equals("text/css"))) {
               response.setHeader("Cache-Control", "max-age=7200");
}The above code set the max-age to 2 hours. We created a jar file for the above class and deployed it C:\sw\jboss-3.2.6\server\<server-config>\deploy\jbossweb-tomcat50.sar
And also made the appropriate entry in the file C:\sw\jboss-3.2.6\server\<server-config>\deploy\jbossweb-tomcat50.sar\conf\web.xml.
The problem is that sometimes the 'expires' attribute of all the files in Temporary Internet Files shows date-time and sometimes it shows 'None'.
We tried using the code below but no luck.
response.setHeader("Expires", "Mon,18 Jan 2038 16:00:00 GMT");
Not sure on how to verify if they are getting cached on the browser (IE 6).
Any help will be appreciated.
- Rahul Mittal
Edited by: Rahul.Mittal on 16 Dec, 2009 4:53 PM

Answer 1

My appologies for posting it into wrong forum. It should have been posted to Web Tier APIs > Java Servlet