but if the UP become a leaf suddenly , if the cache update itself by a UP, the cache itself could remove the leaf node from it , so everytime, there are only UP in the cache. could it be right or not??
that GWebcache is implemented by the Java Servlet which i download from www.gncleus/Gwebcache ,there are some other version ,such as PHP , or Perl ,but i choose the java Servlet!!