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server {
       listen         80;
       server_name    my.domain.com;
       return         301 https://$server_name$request_uri;
}

server {
       listen         443 ssl;
       server_name    my.domain.com;

       [....]
}

# Or, from the server block

# Force HTTPS connection. This rules is domain agnostic
if ($scheme != "https") {
    rewrite ^ https://$host$uri permanent;
}