[update]As grep said,[/update] you're sending a full set of headers (and even content) before your code gets to send the redirect header. You need to have things in this order:
#!/usr/bin/perl
use CGI;
my $cgi = new CGI;
if ($cgi->param('smbt')) {
&creat_cooke(); # sic
exit print $cgi->redirect('http://example.com/path/Welcome.cgi');
}
print $cgi->header();
# [...]
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