if (precache.containsKey(requrl)) {
if (debug)
System.out.println("*** Already downloading: "+ requrl);
try {
CachedResource cr = (CachedResource)precache.get(requrl);
return cr.perform(request);
} catch (Exception ex) {
// there was a problem with the previous request,
// it may be better to do it by ourself
}
}