Perl和MongoDB二进制数据

By default,all database strings are UTF8. To save images,binaries,
and other non-UTF8 data,you can pass the string as a reference to the
database.

我正在抓取页面并希望存储内容以供以后处理.

>我不能依赖meta-charset,因为很多页面都有utf8内容但错误地声明了iso-8859-1或类似内容
>所以不能使用Encode(不知道原始字符集)
>因此,我希望将内容简单地存储为字节流(二进制数据)以供以后处理

我的代码片段：

sub save {
    my ($self,$ok,$url,$fetchtime,$request ) = @_;

    my $rawhead = $request->headers_as_string;
    my $rawbody = $request->content;

    $self->db->content->insert(
        { "url" => $url,"rhead" => $rawhead,"rbody" => $rawbody } ) #using references here
      if $ok;

    $self->db->links->update(
        { "url" => $url },{
            '$set' => {
                'status'       => $request->code,'valid'        => $ok,'last_checked' => time(),'fetchtime'    => $fetchtime,}
        }
    );
}

但得到错误：

Wide character in subroutine entry at
/opt/local/lib/perl5/site_perl/5.14.2/darwin-multi-2level/MongoDB/Collection.pm
line 296.

这是我存储数据的唯一地方.

问题：在MondoDB中存储二进制数据的唯一方法是对它们进行编码,例如：用base64？