Baidu has a so-called network snapshot function. When a search engine collects a web page, it will back it up and store it in its own server cache. When the user clicks on the "webpage snapshot" link in the search engine, the search engine will display the webpage content that was grabbed and saved by the spider system at that time, which is called "webpage snapshot". In other words, you deleted the pictures on the empty network, but Baidu still kept a simple backup. However, if you click on the link further, the words "This webpage is invalid or the original webpage has been deleted" will be displayed at last.