nutch crawling issues

[devang pandey]

I have a website eg . www.example.com. Now when I am crawling this using
nutch 1.4 problem is that of duplicated crawling . There are a number of
pages like www.example.com/s38r84rejkfndn/xyz.aspx . Now this number
s38r84rejkfndn keeps on changing every time you visit this page and hence
crawler is crawling this again and again as for nutch I this this must be a
new url everytime . Please suggest me how to overcome this issue