Just went to Baidu webmaster platform for research, The example of finding the dead link tool of webmaster tool to fill in data is "Sitemap.txt and sitemap.xml. It is estimated that many people's first reaction when they see these two terms is to refer to the sitemap website map, and to see that the sitemap.xml of the blog bar has also been submitted to. Then I immediately submitted the sitemap.xml of the new site to the dead link tool, and I also updated the data in the dead link tool of the blog bar by the way. Suddenly, I had a question. What should sitemap.xml submit is a valid link? I saw the prompt of Baidu platform again