Oh , CGI, 
#### Method: header
# Return a Content-Type: style header
#
####
'header' => <<'END_OF_FUNC',
sub header {
    my($self,@p) = self_or_default(@_);
    my(@header);

    return "" if $self->{'.header_printed'}++ and $HEADERS_ONCE;

[download]
    # Change this to 1 to suppress redundant HTTP headers
    $HEADERS_ONCE = 0;

[download]
$HEADERS_ONCE++,         next if /^[:-]unique_headers$/;

[download]
use CGI qw( -unique_headers );

[download]

In reply to Re^2: Checking a header is printed already? by Anonymous Monk
in thread Checking a header is printed already? by ultranerds

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