How to refresh a page after urlretrive

[Samir Patel]

Friends,
  I used urlretrieve() to retrieve a page which contains unique
session id. After processing this page, I did urlcleanup() and call
urlretrieve() again and unfortunately I am getting same page. If I
refresh that page through browser (Konqueror or ie doesn't matter), if
does bring new page. Also if I wait for about 15 minutes or so, and
call urlretrieve() again, I am getting a new session id. Can somebody
suggest me what I am missing?
  Thanks in advance.