现在需要这样一个功能: 通过 GET 参数 "url" , 读取图片并显示图片

我现在的代码是:

var http = require('http');
var url  = require('url');
http.createServer(function (req, res) {
    var params = url.parse( req.url , true );
    var IMGS = new imageServer( http , url);
    IMGS.http( params.query.url  , function( data ){
        res.writeHead(200, {"Content-Type": data.type}); 
        var img = new Buffer(data.base64, 'base64').toString('binary');
        console.log(data.base64);
        res.end( img );
    });

}).listen(8124);

var imageServer = function( http , url ){
    var _url  = url;
    var _http = http;

    this.http = function(url , callback , method){
        method      = method || 'GET';
        callback    = callback || function(){};
        var urlData = _url.parse(url);
        var request = _http.createClient(80 , urlData.host).
                            request(method, urlData.pathname, {"host": urlData.host});

        request.end();

        request.on('response', function (response)
        {
            var type = response.headers["content-type"],
                body = "";

            response.setEncoding('binary');
            response.on('end', function () {
                var base64 = new Buffer(body, 'binary').toString('base64');
                var data = {
                    type   : type ,
                    base64 : base64 
                };
                callback(data);

            });
            response.on('data', function (chunk) {
                if (response.statusCode == 200) body += chunk;
            });
        });

    };
};

在终端可以看到base64编码后的数据 , 但浏览器只显示空白的图片. 求解