Nginx Code

force www
force non www
forcing HTTPs

The right way is to define a separated server for the naked domain and redirect it.

server {
    listen 80;
    server_name example.org;
    return 301 $scheme://www.example.org$request_uri;
}

server {
    listen 80;
    server_name www.example.org;
    ...
}

Note that this also works with HTTPS site.

>> Go to this page.

You will need 2 server blocks for this:

server {
    listen 80;
    server_name example.org;
}

server {
    listen 80;
    server_name www.example.org;
    return 301 $scheme://example.org$request_uri;
}

>> Go to this page.

server {
    listen 80;
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl;

    # let the browsers know that we only accept HTTPS
    add_header Strict-Transport-Security max-age=2592000;

    ...
}