Find Broken / Invalid Images on a Page

package com.linked;

import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

public class FindBrokenImages {

    private WebDriver driver;
    private int invalidImageCount;

    @BeforeClass
    public void setUp() {
        driver = new FirefoxDriver();
        driver.get("http://google.com");
    }

    @Test
    public void validateInvalidImages() {
        try {
            invalidImageCount = 0;
            List<WebElement> imagesList = driver.findElements(By.tagName("img"));
            System.out.println("Total no. of images are " + imagesList.size());
            for (WebElement imgElement : imagesList) {
                if (imgElement != null) {
                    verifyimageActive(imgElement);
                }
            }
            System.out.println("Total no. of invalid images are "    + invalidImageCount);
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(e.getMessage());
        }
    }

    @AfterClass
    public void tearDown() {
        if (driver != null)
            driver.quit();
    }

    public void verifyimageActive(WebElement imgElement) {
        try {
            HttpClient client = HttpClientBuilder.create().build();
            HttpGet request = new HttpGet(imgElement.getAttribute("src"));
            HttpResponse response = client.execute(request);
            // verifying response code he HttpStatus should be 200 if not,
            // increment as invalid images count
            if (response.getStatusLine().getStatusCode() != 200)
                invalidImageCount++;
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}