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

server {
    listen 443 ssl;

    ssl_certificate /path/to/server.cert;
    ssl_certificate_key /path/to/server.key;

    server_name www.example.com;
    return 301 https://example.com$request_uri;
}

server {
    listen 443 ssl;
    ssl_certificate /path/to/server.cert;
    ssl_certificate_key /path/to/server.key;
    server_name example.com;

    <все локации основного домена>
}