return send_file( '/dev/zero',
        streaming    => 1,
        system_path  => 1,
        content_type => $mime_type,
        callbacks    => {
            around => sub {
                my ($writer, $content) = @_;

                my $buf = '';
                while( read( $in_fh, $buf, VID_READ_LENGTH ) ) {
                    $writer->write( $buf );
                }
            }
        },
    );