Its simple, myModule has code in it which does more than define general HTML content generating sub routines in it it reads all the POST data and makes it unavailable to your main program

One way this could happen is using  my $q = CGI->new; instead of  my $q = CGI->new( { } );

First version will consume POST data the second one won't

In reply to Re: Blank HTTP POST request, if script has another module in it. (CGI.pm) by Anonymous Monk
in thread Blank HTTP POST request, if script has another module in it. by msinfo

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