Set up customization correctly404 error pageIt can enhance the user experience, help users find other information they need, or further guide users to browse the website. However, if it is not properly set, it can even lead to the downgrade of search engines. Therefore, during the specific seo application process, you should pay attention to the impact of customized 404 pages on search engines, correctly configure 404 pages to prevent returning the "200" status code, or use Meta Refresh to cause the "302" status code to be returned.
For users, there is no big difference what Http status code is returned, whether it is "404" or "200", but it is completely different for search engines.
Search engines use HTTP status codes to identify the status of web pages. When a search engine spider obtains a "404" status code when grabbing a certain URL, it will know that the URL has expired and give up indexing the link. After a period of time, it will gradually delete the type of webpage from the index database; When a 200 or 302 status code is returned, the search engine will establish an index for the link, which will lead to many different URLs having exactly the same copy content, which will be downgraded by the search engine.
Therefore, making a 404 error page well still plays a very important role in seo.How to make a 404 pageHere, more SEO knowledge is availableBeijing seoblog