如何强制 Nginx 将全站转向 WWW 和 HTTPS

server {
    listen 80 default_server;
    listen [::]:80 default_server;
    server_name example.com www.example.com;

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


server {
    listen *:443 ssl; 
    listen [::]:443 ssl; 
    server_name example.com;

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

server {
    listen *:443 ssl http2; 
    listen [::]:443  ssl http2; 
    server_name www.example.com;      
              
    add_header Strict-Transport-Security "max-age=63072000; includeSubdomains; preload";
    add_header X-Frame-Options "DENY";

    charset utf8;

    access_log  /var/log/nginx/*.example.com/access.log  main;
    error_log  /var/log/nginx/*.example.com/error.log warn;

    location / {
        root   /root/itcoder/public;
        index  index.html index.htm;
    }

    # ssl on;
    ssl_certificate /etc/nginx/ssl/*.example.com.crt;
    ssl_certificate_key /etc/nginx/ssl/*.example.com.key;
    ssl_session_timeout  5m;
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:!NULL:!aNULL:!MD5:!ADH:!RC4:!DH:!DHE;
    ssl_prefer_server_ciphers  on;

    error_page  404              /404.html;
#    location = /404.html {
 #       root   /usr/share/nginx/html;
 #   }

    # redirect server error pages to the static page /50x.html
    #
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }
}

nginx -t

nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

nginx -s reload

systemctl reload nginx