[Tutor] (OT) Monitorising WEB POSTs

[Peter Jessop]

I am building a python application to automate information capture
from a web site.
I want to use a python application to request and process the
information instead of using the site's WEB page.
However I am having problems finding out exactly what data the server expects.
I have a firefox add-in called Web Developer that gives me good
information about the form (fields names etc..)
But what I want to do is find out exactly what POST data my browser is sending.

I am aware of two ways of doing this.
a) A sniffer to read the udp packet sent from my computer
b) Send the page to my own WEB server

Is there a program or add in that will give me this information
without resorting to the solutions above.

Peter Jessop