Not sending a complete set of HTTP headers often means not sending any. Not sending any often means the program is dying before it produces any output. Try running your code under Strawberry as the IIS user and see if it gives you any errors. That, or try CGI::Carp or something to get the errors in your browser.

use CGI::Carp qw( fatalsToBrowser );
die "Fatal error messages are now sent to browser";
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