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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