redirect non-www to www nginx in linux code example

Example 1: nginx redirect www to non-www

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

Example 2: nginx redirect to non www

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