How do search engines react to specifying the language of a page in a URI?

Question

Search engines

Question for SEO experts. If you specify the language of the page example.com/en/page.html in the URL , then, obviously, the page in English will be displayed. If you skip the indication of the language, then the page in the current system language will be displayed. That is, different URLs lead to the same page. How search engines behave in this case, and is it not better to do 301 Moved Permanently on a URL with an explicit indication of the language

Answer 1

The same as for any other URL, for example, if there are links to one page with different get parameters.
The popularity of a particular page (and hence its position in the SERP) depends on the distribution of links within and the number of external links to each of the pages.

Answer 2

be sure to do either a redirect otherwise you will have duplicates and the weight of the pages will decrease, just like no /page/1 leading to the first page of the list and other duplication, otherwise optimizers first of all try to remove such crap.

Answer 3

Google in its projects uses a redirect from www.example.com/some/path (English) to www.exapmle.com/intl/ru/some/path either by accept-language, or by cookies, or by session (too lazy to experiment). The www.example.com/intl/en/some/path page also exists (it’s too lazy to experiment whether the redirect goes there if the minimum headers are sent (no accept-language and cookies) or gives what was requested - in the search results in English it is displayed without indicating the language in the url, so most likely the main one is issued).
PS redirect 302 they use for this

Answer 4

In fact, example.com/en/page.html and example.com/page.html are considered different pages with different content, the first with English text, the second with, say, Russian, then this is normal and no redirects are needed, but in search engines you will look quite normal.
But if the content is duplicated on both pages, then you should choose one URL to which the redirect will be.

Answer 5

It seems to me that after entering the page, it is necessary to give all links with the necessary language. Those. you will have a duplicate index page of the site at most, but you can redirect it.
Google itself will not accidentally go to site.name/page.html if you add a language before each link.