var http = require('http');

​

getData(process.argv[2], function onGet1(){

    getData(process.argv[3], function onGet2(){

        getData(process.argv[4]);

    };

});

​

function getData(url, callback) {

    http.get(url, function onGetData(res) {

        var statusCode = res.statusCode;

​

        var error;

        if(statusCode > 300){

            error = new Error('Request Failed.\n Status Code: ' + statusCode);

        }

​

​

        if (error) {

            console.log(error.message);

            res.resume();

            return;

        }

​

        var data = "";

        res.on('data', function onData(chunk) {

            data += chunk;

        });

​

        res.on('end', function onEnd() {

            console.log(data);

            if(callback){

                callback(); 

            }

        });

    }).on('error', function onError(e) {

      console.log('Error get data :' + e);

    });

}

​

​

​