If you have paid attention to URL normalization, then when users access the homepage, the address displayed in the browser should be the standardized address you have specified. For this blog, it is "www.scseoer.com". A query to "scseoer.com" should return a status code of 301, while "www.scseoer.com" should return a status code of 200. Of course, if you have other URLs for your homepage (such as the default homepage of the website), they should also undergo normalization processing, redirecting them via a 301 redirect to the predefined standardized URL. Returning to the focus of the article: the dilemma regarding snapshots and rankings for domains with and without "www".