Node 讀取圖片並顯示

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});
        res.write(data.body, "binary");
        res.end();
    });

}).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 data = {
                    type: type,
                    body: body
                };
                callback(data);

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

    };
};