my $self = shift;
    my $file;

    my $cd = $self->header('Content-Disposition');
    if ($cd) {
	require HTTP::Headers::Util;
	if (my @cd = HTTP::Headers::Util::split_header_words($cd)) {
	    my ($disposition, undef, %cd_param) = @{$cd[-1]};
	    $file = $cd_param{filename};

	    # RFC 2047 encoded?
	    if ($file && $file =~ /^=\?(.+?)\?(.+?)\?(.+)\?=$/) {
		my $charset = $1;
		my $encoding = uc($2);
		my $encfile = $3;

		if ($encoding eq 'Q' || $encoding eq 'B') {
		    local($SIG{__DIE__});
		    eval {
			if ($encoding eq 'Q') {
			    $encfile =~ s/_/ /g;
			    require MIME::QuotedPrint;
			    $encfile = MIME::QuotedPrint::decode($encfile);
			}
			else { # $encoding eq 'B'
			    require MIME::Base64;
			    $encfile = MIME::Base64::decode($encfile);
			}

			require Encode;
			require encoding;
			# This is ugly use of non-public API, but is there
			# a better way to accomplish what we want (locally
			# as-is usable filename string)?
			my $locale_charset = encoding::_get_locale_encoding();
			Encode::from_to($encfile, $charset, $locale_charset);
		    };

		    $file = $encfile unless $@;
		}
	    }
	}
    }

    my $uri;
    unless (defined($file) && length($file)) {
	if (my $cl = $self->header('Content-Location')) {
	    $uri = URI->new($cl);
	}
	elsif (my $request = $self->request) {
	    $uri = $request->uri;
	}

	if ($uri) {
	    $file = ($uri->path_segments)[-1];
	}
    }

    if ($file) {
	$file =~ s,.*[\\/],,;  # basename
    }

    if ($file && !length($file)) {
	$file = undef;
    }

    $file;
}


sub as_string
{
    require HTTP::Status;
    my $self = shift;
    my($eol) = @_;
    $eol = "\n" unless defined $eol;

    my $status_line = $self->status_line;
    my $proto = $self->protocol;
    $status_line = "$proto $status_line" if $proto;

    return join($eol, $status_line, $self->SUPER::as_string(@_));
}


sub dump
{
    my $self = shift;

    my $status_line = $self->status_line;
    my $proto = $self->protocol;
    $status_line = "$proto $status_line" if $proto;

    return $self->SUPER::dump(
	preheader => $status_line,
        @_,
    );
}