# Set a last-modified date a little in the future to handle
	# local workstation times being slightly out. Is that valid?
    my $date = DateCalc('today', '+ 5 minutes');
    $date = Date_ConvTZ($date, "", "GMT");

    $self->header_add(
        -expires       => 'Sat, 26 Jul 1997 05:00:00 GMT',
        -Last_Modified => UnixDate($date, '%a, %d %b %Y %H:%M:%S GMT'),
        # HTTP/1.0
        -Pragma        => 'no-cache',
        # HTTP/1.1
        -Cache_Control => join(', ', qw(
                no-store
                no-cache
                must-revalidate
                proxy-revalidate
                post-check=0
                pre-check=0
                max-age=0
                s-maxage=0
        )),
    );