Exxternal image shows in Sprite on cocos2d-x v3.x

getImage.cpp

#include "network/HttpRequest.h"
#include "network/HttpClient.h"
#include "network/HttpResponse.h"

using namespace cocos2d::network;

HttpRequest* request = new HttpRequest();
request->setUrl("http://example.com/external/image.png");
request->setRequestType(HttpRequest::Type::GET);
request->setResponseCallback([this](HttpClient *sender, HttpResponse *response) {
    if ( ! response->isSucceed() ) {
        return;
    }
    
    std::vector<char> *buffer = response->getResponseData();

    Image* image = new Image();
    image->initWithImageData(reinterpret_cast<unsigned char*>(&(buffer->front())), buffer->size());
    
    Texture2D* texture = new Texture2D();
    texture->initWithImage(image);
        
    Sprite* sprite = Sprite::createWithTexture(texture);
    Size visibleSize = Director::getInstance()->getVisibleSize();
    Vec2 origin = Director::getInstance()->getVisibleOrigin();
            
    Size size = sprite->getContentSize();
            
    sprite->setPosition(Vec2((visibleSize.width + origin.x)/2,
                             (visibleSize.height + origin.y)/2));
            
    this->addChild(sprite, 100);
        
    image->release();
    texture->release();
    
});

HttpClient::getInstance()->send(request);
request->release();