I send the exact same headers - though I let Tomcat's default servlet
handle the "Date" one, and I just hardcode the Expires header to "Thu, 01
Jan 1970 00:00:00 GMT". I am running on Tomcat 6 and not Glassfish, but I
have not encountered the issue you're seeing.
This may help, here's my server's response headers for a GET request to our
nocache file (Tomcat is handling everything aside from the Cache-Control,
Expires and Pragma headers):
HTTP/1.1 200 OK
Cache-Control: no-cache, no-store, must-revalidate
Pragma: no-cache
Content-Length: 7263
Content-Type: text/javascript
Expires: Thu, 01 Jan 1970 00:00:00 GMT
Last-Modified: Mon, 25 Jun 2012 11:07:44 GMT
Accept-Ranges: bytes
Etag: W/"7263-1340622464989"
Date: Tue, 26 Jun 2012 14:29:40 GMT
On Monday, June 25, 2012 11:27:10 AM UTC-4, Jonas wrote:
>
> I am trying to implement the GWT "perfect caching" by using a custom javax
> servlet filter. All files containing .nocache. should never be cached, and
> files containing .cache. should be cached for a week.
>
> Here is the code for my filter:
>
> public class GWTCacheControlFilter implements Filter
> {
> @Override
> public void destroy()
> {
> }
>
> @Override
> public void init(final FilterConfig config) throws ServletException
> {
> }
>
> @Override
> public final void doFilter(final ServletRequest request, final
> ServletResponse response, final FilterChain filterChain)
> throws IOException, ServletException
> {
> final HttpServletRequest httpRequest = (HttpServletRequest)
> request;
> final String requestURI = httpRequest.getRequestURI();
>
> if (requestURI.contains(".nocache."))
> {
> final Date now = new Date();
> final HttpServletResponse httpResponse = (HttpServletResponse)
> response;
> httpResponse.setDateHeader("Date", now.getTime());
> httpResponse.setDateHeader("Expires", now.getTime() -
> 86400000L);
>
> httpResponse.setHeader("Pragma", "no-cache"); // HTTP 1.0
> httpResponse.setHeader("Cache-control", "no-cache, no-store,
> must-revalidate"); // HTTP 1.1
> }
> else if (requestURI.contains(".cache."))
> {
> final HttpServletResponse httpResponse = (HttpServletResponse)
> response;
> httpResponse.setDateHeader("Expires",
> System.currentTimeMillis() + 604800000L); // 1 week in future.
> }
>
> filterChain.doFilter(request, response);
> }
> }
>
> When I reload the page I see in Firebug a 304 Not Modified status on my
> initial myapp.nocache.js file, which sometimes leads to people seeing only
> a white page after a new deploy. If I inspect the headers of the nocache
> file I don't see any Expires-tag.
>
> The .cache. files seem to be cached correctly however (one week):
>
> Date: Mon, 25 Jun 2012 15:11:57 GMT
> Expires: Mon, 02 Jul 2012 15:11:57 GMT
>
> I am using guice so in my servlet module I do:
>
> filter("*").through(GWTCacheControlFilter.class);
>
> However I have also tried adding the following to web.xml:
>
> <filter>
> <filter-name>gwtCacheControlFilter</filter-name>
> <filter-class>my.package.GWTCacheControlFilter</filter-class>
> </filter>
>
> <filter-mapping>
> <filter-name>gwtCacheControlFilter</filter-name>
> <url-pattern>/*</url-pattern>
> </filter-mapping>
>
> Anyone have some ideas what I am missing? I'm deploying using Glassfish
> Open Source edition 3.1.1.
>
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