Check if Image exists on Url while crawling

checkimages404.js

var validUrl = require('valid-url');


 if(validUrl.isUri(imageUrl)){
                    request
                        .get(imageUrl)
                        .on('response', function (response) {
                            console.log(response.statusCode)
                            imagesName = (imagesName.split('?')[0])
                            if (response.statusCode == 200) {
                                this.pipe(fs.createWriteStream('images/' + imagesName)).on('close', function () {
                                    cb();
                                });

                            } else {
                                cb();
                            }

                        }).on('error' , function(){
                            console.log('error testing')
                            cb();
                        })
                }