TcpWatch is a great program to view what goes on during a transaction. You can find it at http://www.zope.org/Members/hathawsh/tcpwatch
You run it as:
$ python tcpwatch.py 8080 myserver.com 80</code>
And when you connect to localhost:8080, you'll get pages from myserver.com:80 -- except that everything that goes back and forth will be tracked through a nice Tk interface.
-- IanBicking - 15 Nov 2001