node.js/express chaining multiple get commands

I have a route I that in order to get all the data needs to access the API server multiple times (according to the data that was given).

Now I need to add a third access to the server and it's getting rather unreadable.

The following code is working, but I have a feeling I'm not doing it right (promises?) - couldn't figure out what exactly is recommended in this case

The code: (stripped down to emphasise the point)

router.get('/', function(req, main_response) {
        http.get(FIRST_API_COMMAND, function (res) {
            var moment_respose_content = '';
            res.on("data", function (chunk) {
                moment_respose_content += chunk;
            });
            res.on('end',function(){
                if (res.statusCode < 200 || res.statusCode > 299) {
                    main_response.send('error in getting moment');
                    return;
                }
                var response = JSON.parse(moment_respose_content );
                if (response.success)
                {
                    var data = response.data;
                    //doing something with the data
                    http.get(SECOND_API_COMMAND, function (res) {
                        res.on("data", function (chunk) {
                            comment_respose_content += chunk;
                        });

                        res.on('end',function(){
                            var response = JSON.parse(comment_respose_content);
                            if (response.success)
                            {
                                var comments = response.data;
                                main_response.render('the page', {data: data});
                                return;
                            }
                        });
                    }).on('error', function (e) {
                        console.log("Got error: " + e.message);
                        main_response.send('Error in getting comments');
                    });
                    return;
                }
            });
        }).on('error', function (e) {
            console.log("Got error: " + e.message);
            main_response.send('Error in getting moment');
        });
});