So now I created a servlet filter that listens for request for the
offline manifest. Not perfect, but working.
Upon requesting the offline manifest, the filter redirects to the
version applicable for the current user-agent.
Problem is, that as soon as there is no network connection, the
offline mode does not work...
Do I have to rename the returned offline manifest to match the name
described in the HTML file? (appcache.nocache.manifest)
Because now I return appcache.nocache.manifest.gecko1_8 for example...
If it needs to be renamed how can this rename be achived with a
servlet filter?
Right now the only technique I am aware of is to send a redirect...
Thanks for your help!
Stefan
Here is the filter code....
package com.siemens.html5.whiteboard.server.filters;
import java.io.IOException;
import java.util.HashMap;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class OfflineManifestFilter implements Filter {
public static final HashMap<String, String> offlineManifestMap = new
HashMap<String, String>(6);
static {
offlineManifestMap.put("Chrome",
"appcache.nocache.manifest.gecko1_8");
offlineManifestMap.put("Firefox",
"appcache.nocache.manifest.gecko1_8");
offlineManifestMap.put("Safari",
"appcache.nocache.manifest.safari");
offlineManifestMap.put("Opera",
"appcache.nocache.manifest.opera");
offlineManifestMap.put("MSIE8",
"appcache.nocache.manifest.ie8");
offlineManifestMap.put("MSIE7",
"appcache.nocache.manifest.ie7");
offlineManifestMap.put("MSIE6",
"appcache.nocache.manifest.ie6");
}
public static final String OFFLINE_MANIFEST =
"appcache.nocache.manifest";
@Override
public void destroy() {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain fc) throws IOException, ServletException {
HttpServletRequest httpRequest = (HttpServletRequest)req;
if (httpRequest.getRequestURI().contains(OFFLINE_MANIFEST)) {
String userAgent = ((HttpServletRequest)
req).getHeader("User-
Agent");
System.out.println("User-Agent: " +userAgent);
for (String browser : offlineManifestMap.keySet()) {
if (userAgent.contains(browser)) {
System.out.println("Sending redirect
to; "
+httpRequest.getRequestURI().replace(OFFLINE_MANIFEST,
offlineManifestMap.get(browser)));
((HttpServletResponse)res).sendRedirect(httpRequest.getRequestURI().replace(OFFLINE_MANIFEST,
offlineManifestMap.get(browser)));
}
}
}
fc.doFilter(req, res);
}
@Override
public void init(FilterConfig cfg) throws ServletException {
// TODO Auto-generated method stub
}
}
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