Why does it automatically switch from http to https?

Question

Nginx

Initially, apache was configured on the VPS, after an unsuccessful attempt to install a mail server, or rather a boxed Mail-in-a-Box solution that screwed everything up on the server, removed apache, installed nginx. It’s possible to restore everything back to apache manually, but for some reason, when switching to a domain, it automatically switches to the https version, although this is not written in the apache redirect.
The standard apache page (with a message that everything is working) shows normally by IP, but when you go to the site it switches to https and of course the page is not found

Answer 1

There is another option in which the browser automatically "redirects" from http to https
More details here: habrahabr.ru/post/216751
The setting is called "HTTP Strict-Transport-Security" and in the config it looks something like this:
If you want the setting to be used in the same way for subdomains (subdomains such as xxx.example.com, xxx2.example.com, etc.), the includeSubDomains parameter is specified
max-age means the number of seconds during which the browser remembers that the domain has https and should be forced to use it. max-age=31536000 = 1 year.

Answer 2

The problem was just in the browser! This, as it turned out, cached!