How to redirect from www in catch all block when server_name is not used?

Question

Nginx

With such settings, it knocks out the error "too many redirects" in the browser

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

  location / {}
}

server {
  listen 80;
  listen [::]:80;
  server_name www.*;
  return 301 $scheme://$host$request_uri;
}

How then to redirect default_server?

Answer 1

server {
  listen 80;
  listen [::]:80;
  server_name www.*;
  return 301 $scheme://$host$request_uri;
}

There in $host there will be a domain with www and a loop will occur.

server {
  listen 80;
  listen [::]:80;
  server_name ~^www\.(?<domain>.+)$;
  return 301 $scheme://$domain$request_uri;
}

Or

map $host $domain {
    ~^www\.(.+) $1;
}

server {
  listen 80;
  listen [::]:80;
  server_name www.*;
  return 301 $scheme://$domain$request_uri;
}

Answer 2

why are you using default_server at all; ?
On it, put "hello this server, but something went wrong"
And for the site, make a normal separate file with a separate

server {
 listen *:80;
        server_name www.site.ru site.ru  ;
        root /var/www/site.ru/web;
.........

 server {
 listen *:443;
        server_name www.site.ru site.ru  ;
        root /var/www/site.ru/web;
.........