Answers for "non www to www redirect nginx"

nginx redirect www to non-www

server {
    server_name www.example.com;
    return 301 $scheme://example.com$request_uri;
}

nginx redirect to non www

server {
    server_name www.example.com;
    return 301 $scheme://example.com$request_uri;
}

redirect www to non-www nginx

# With wildcard:

server {
    server_name ~^(www.)(?<domain>.+)$;
    return 301 $scheme://$domain;
}