sub _read_header_lines {
    my $self = shift;
    my $junk_out = shift;

    my @headers;
    my $line_count = 0;
    my $max_header_lines = ${*$self}{'http_max_header_lines'};
    my $headers = '';
    while (my $line = my_readline($self)) {
	$headers .= "$line_count: $line\n";
	if ($line =~ /^(\S+)\s*:\s*(.*)/s) {
	    push(@headers, $1, $2);
	}
	elsif (@headers && $line =~ s/^\s+//) {
	    $headers[-1] .= " " . $line;
	}
	elsif ($junk_out) {
	    push(@$junk_out, $line);
	}
	else {
	    die "Bad header: '$line'\n";
	}
	if ($max_header_lines) {
	    $line_count++;
	    if ($line_count >= $max_header_lines) {
		die "Too many header lines($line_count) (limit is $max_header_lines) They are:\n$headers";
	    }
	}
    }
    return @headers;
}