Your problem is you aren't doing this
my( $headers, $contents ) = DoStuff( $cgi );
print $headers, $contents;
Each HTTP request is headers + contents, and so is each HTTP response
When you have if( $this ){ print $that } elsif( $that }{ print $other; } ... when you're mixing it all up, when you don't separate the things your program does into ThisPage() ThatPage() OtherPage(), you get confused and forget how HTTP wants to have things, headers + contents, not headers + headers
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