How to make a 301 redirect in nginx from all domains and subdomains to one?

Question

Nginx

Good day!
There was a problem, please tell me how to solve it.
There are 2 domains: a.ru and b.ru It is
necessary through 301 redirect all requests from a.ru www.a.ru https://www.a.ru b.ru www.b.ru https://b.ru https://www.b.ru redirect to https://a.ru and if the request comes with a parameter, then take it into account too, i.e. from www.a.ru/123 to https://a.ru/123 , etc.
With a similar nginx configuration:

server {
listen 80;
listen 443;
ssl on;  
ssl_certificate /fullchain.pem;
ssl_certificate_key /privkey.pem;
server_name a.ru www.a.ru b.ru www.b.ru;
return 301 https://a.ru$request_uri;# (rewrite ^/(.*)$ https://a.ru/$1 permanent;  - тоже пробовал, не помогло)
root /www/html;

Firefox "Firefox has detected that the server is redirecting the request for this address in a way that will never complete." and Chrome "redirected you too many times." are not allowed on the site.

Answer 1

If you want your server to work very fast and without loops, you need to create separate groups for each of the domains.

server {
    server_name b.ru;
    return 301 https://a.ru$request_uri;
}

server {
    server_name www.b.ru;
    return 301 https://a.ru$request_uri;
}

server {
    server_name www.a.ru;
    return 301 https://a.ru$request_uri;
}

server {
    server_name a.ru;
    listen 80;
    return 301 https://a.ru$request_uri;
}

server {
    server_name a.ru;
    listen 443 ssl ;
    listen [::]:443 ssl  ipv6only=on;
    ssl on;
    # и так далее
}