Thanks for help.

Actually, that's not so bad as it seems, those random 
generated links are generated at article insert time, 
which means they will not change over time.  
(Otherwise, it's impossible.)

How about the trick filter 
-www.foo.com/bar/homepage.htm*
I found that / and \ make big difference, when on PC, 
they are same, but Httrack only take /.
If I include "*" at the end, only one page download.  
If I don't include "*", it still goes in loops.

Is this expected behavior?