in reply to
IE wont post after initial request
IE does not like cache pragmas very much... more information here and here
Instead you can approach in this way:
1) instead of a static html form, generate it with Perl
2) in place of the simple name of your script (to put in the "action" attribute of the form) put the name followed by a ? and a random number.
So, IE will think that you're calling a different script.
my $rand_num=rand time;
Kudos to larsen
for showing me this trick