how to deal with 404 pages in the site?
authoritative answers to baidu webmaster platform:it is recommended to uniformly screen the recent 404 pages of the entire site and make them into a dead link. sitetmap documentation (see production help http://www.baidu.com/search/badlink_help.html), log in to the webmaster platform and submit using the dead link tool. reduce the negative impact of 404 pages on the website.
related SEO term explanation:
404:404 it is the status code generated after deleting the web page. although the web page cannot be opened, the link still exists. they are very bad for both user experience and website health, and it is usually best to set up a 301 redirect.
404page:page not found. when a web page has been deleted but the link to it remains, they are not conducive to user experience and website health, and it is usually best to set up a 301 redirect.
mirroring site:mirroring site ( Mirror Site), complete copy of the website, placed in other URL superior. they will be used when the original website generates too much traffic that the server cannot support it. mirroring sites can serve people in different locations (different continents) and ensure a good user experience and fast page loading.

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