数据可以正常写入数据库，图片下载报错

报错代码：

2024-07-01 21:55:04 [scrapy.pipelines.media] ERROR: [Failure instance: Traceback: <class 'scrapy.pipelines.files.FileException'>: 
E:\Envs\article_spider\Lib\site-packages\twisted\internet\defer.py:536:addCallbacks
E:\Envs\article_spider\Lib\site-packages\twisted\internet\defer.py:1078:_runCallbacks
E:\Envs\article_spider\Lib\site-packages\scrapy\pipelines\media.py:197:_check_media_to_download
E:\Envs\article_spider\Lib\site-packages\twisted\internet\defer.py:536:addCallbacks
--- <exception caught here> ---
E:\Envs\article_spider\Lib\site-packages\twisted\internet\defer.py:1078:_runCallbacks
E:\Envs\article_spider\Lib\site-packages\scrapy\pipelines\files.py:459:media_failed
]
NoneType: None

下载图片代码：

class ArticleImagePipeline(ImagesPipeline):
    def file_path(self, request, response=None, info=None, *, item=None):
        name = request.url.split('/')[-1]
        return name

    def get_media_requests(self, item, info):
        print('get_media_requests---')
        for img_url in item['front_img_url']:
            yield scrapy.Request(url=img_url)

    def item_completed(self, results, item, info):
        if results:
            ok, res = results[0]
            if ok:
                item['front_img_path'] = res["path"]
        return item