如何将Facebook图片URL作为图片保存/复制到我的服务器？

from flask import Flask, request
import urllib.request

app = Flask(__name__)

@app.route('/save_image', methods=['POST'])
def save_image():
    image_url = request.form.get('image_url')  # 获取POST请求中的图片URL参数
    image_name = 'saved_image.jpg'  # 保存图片的文件名

    # 下载图片并保存到服务器
    urllib.request.urlretrieve(image_url, image_name)

    return 'Image saved successfully!'

if __name__ == '__main__':
    app.run()

function saveImageToServer(imageUrl) {
    var xhr = new XMLHttpRequest();
    xhr.open('POST', '/save_image', true);
    xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xhr.onreadystatechange = function() {
        if (xhr.readyState === 4 && xhr.status === 200) {
            console.log(xhr.responseText);
        }
    };
    xhr.send('image_url=' + encodeURIComponent(imageUrl));
}

// 调用函数并传入Facebook图片URL
var facebookImageUrl = 'https://example.com/facebook_image.jpg';
saveImageToServer(facebookImageUrl);