How to make a redirect depending on the browser language?

Question

Nginx

I am moving a website from one server to another.
Apache was used on the old server, Nginx on the new one.
Previously, there was this .htaccess:

RewriteEngine on
 # редирект на русскоязычную версию сайта
 RewriteCond %{REQUEST_URI} ^/$ [NC]
 RewriteCond %{HTTP:Accept-Language} (ru|uk|be|kk|mo|ka|et|bg|az) [NC]
 RewriteRule .* http://ru.site.net/ [R=302,L]
 # редирект на англоязычную версию сайта для всех остальных языков
 RewriteCond %{REQUEST_URI} ^/$ [NC]
 RewriteRule .* http://en.site.net/ [R=302,L]

Now you need to configure the same on Nginx, but on a new server. Tell me how to do this if I have 2 folders, in which everything is in Russian in one, and in English in the other. configured 2 server sections in nginx/conf.d/

server {
    listen 80;
    listen [::]:80;

    root /home/site/www/site.net;
    index index.php index.html index.htm index.nginx-debian.html;

    server_name site.net www.site.net;

    location / {
        try_files $uri $uri/ =404;
    }

    location ~ \.php$ {
        include fastcgi_params;
        fastcgi_pass unix:/run/php/php7.0-fpm.sock;
    }

    location ~ /\.ht {
        deny all;
    }
}
server {
    listen 80;
    listen [::]:80;

    root /home/site/www/ru.site.net;
    index index.php index.html index.htm index.nginx-debian.html;

    server_name ru.site.net www.ru.site.net;

    location / {
        try_files $uri $uri/ =404;
    }

    location ~ \.php$ {
        include fastcgi_params;
        fastcgi_pass unix:/run/php/php7.0-fpm.sock;
    }

    location ~ /\.ht {
        deny all;
    }
}
server {
    listen 80;
    listen [::]:80;

    root /home/site/www/en.site.net;
    index index.php index.html index.htm index.nginx-debian.html;

    server_name en.site.net www.en.site.net;

    location / {
        try_files $uri $uri/ =404;
    }

    location ~ \.php$ {
        include fastcgi_params;
        fastcgi_pass unix:/run/php/php7.0-fpm.sock;
    }

    location ~ /\.ht {
        deny all;
    }
}

Answer 1

Did it like this:

map $http_accept_language $lang {
    default en;
    ~ru ru;
    ~uk ru;
    ~be ru;
    ~kk ru;
    ~mo ru;
    ~ka ru;
    ~et ru;
    ~bg ru;
    ~az ru;
}
...
server {
    listen 80;
    listen [::]:80;

    root /home/site/www/site.net;
    index index.php index.html index.htm index.nginx-debian.html;

    server_name site.net www.site.net;

    location = / {
  if ($lang = 'ru') {
    rewrite (.*) http://ru.site.net;
    }
  rewrite (.*) http://en.site.net;
  }

  location / {
        try_files $uri $uri/ =404;
    }

    location ~ \.php$ {
        include fastcgi_params;
        fastcgi_pass unix:/run/php/php7.0-fpm.sock;
    }

    location ~ /\.ht {
        deny all;
    }
}

Answer 2

Train yourself to search and read the docks correctly. Nginx has an Accept Language module
From the docs:
Alternative
You can manage $language_suffix by this setting when you cannot add this module into your system.
# accept-language: en,en-US;q=0.8,ja;q=0.6
set $first_language $http_accept_language;
if ($http_accept_language ~* '^(.+?),') {
set $first_language $1;
}
set $language_suffix 'en';
if ($first_language ~* 'ja') {
set $language_suffix 'ja';
}
By default, the module is not built.
https://www.nginx.com/resources/wiki/modules/accep...
Good luck!