First of all, we need to know that 301 redirection can indeed be a webpage that automatically jumps to a custom URL. However, there must have been some of the effect on Baidu before, because Baidu snapshots used to display custom URLs after 301 redirection, the previous 301 redirection is effective, and Baidu algorithms have been continuously updated and redirected recently, this is most likely due to database errors. As shown in Figure 1, we can see that all these websites have been redirected to 301.
 
We can see that the external and internal links sent by these websites are URLs with www, but the snapshots with www are not ranked, but those without www are ranked, it is possible that those external chains are counterproductive, and Baidu hates those extensive external chains. In addition, we recently discovered that the external chain has not had a great impact on the spider. In our website logs, we can find that, even though many of your external links are sent, however, the number of visits from Baidu Spider remains unchanged. We can imagine that Baidu spider's dependence on external links is not that high.
 
Another possibility is that Baidu intends to let Webmasters know that the effect of the external chain is not that great. Only by focusing on the content of the website itself is feasible. Only by letting the webmaster know the direction of his rectification can Baidu provide more and better content to users. In the last two or three months, Baidu has updated algorithms many times, making many websites not ranked in the rankings. Baidu's goal is to purify website content for websites with no substantive content, all websites that are unfavorable to users are K websites. The most serious one is the medical industry. Content plagiarism is very serious and the most serious. Therefore, we must pay attention to the content update and writing of the website itself, rather than spending so much unnecessary time out of the chain, which is also a new direction for seo reform in the future.