How to specify the main mirror in the Google Search Console
Two versions of the same website with the www prefix and without it also belong to the category of mirrors.
If you do not specify the main version of the website to search bots, another domain may fall into the SERP. Over time, the pages of the main mirror supersede all minor versions from the search.
How site mirrors appear
According to SEO experts, search engines perceive sites as mirrors if their content matches more than 80%.
It happens that when checking the website is defined as glued to another resource. So the search engines noticed the coincidence of information on several sites and made one of them the main one. How to transfer a site to a new domain? Domains need to be "stuck" by changing the content or setting up a 301 redirect.
Options for the appearance of mirrors
- Access to the site through a domain with the www prefix and without;
- site availability via http and https;
- the presence of identical content on different URLs;
- the same site in different domain zones.
How to specify the main mirror in the Google Search Console

Setting up call forwarding when manually creating a site's mirror
Basically, webmasters, like search engines, choose the version without the www prefix as the main mirror. But if your domain is too short or you have already managed to advertise a site with a prefix offline, you can choose the main version from www. The way out is to configure a 301 redirect of pages through the server.
In order not to do this manually for each page, you need to make several entries in the .htaccess file. Download the file from the root folder of the site and open it in the editor, then enter the lines:


Host: www.new-site.ru
Now you need to configure the redirect of all pages to the new domain. To do this, add this code to the .htaccess file:

Conclusion
If you plan to move the site to a new domain or create an additional version, you need to configure a 301-redirect of all pages to the main mirror.
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