Self-signed SSL Nginx server block

gistfile1.txt

server {
    listen 80 default_server;
    listen [::]:80 default_server;
    server_name example.com;
    return 302 https://$server_name$request_uri;
}

server {

    listen 443 ssl http2 default_server;
    listen [::]:443 ssl http2 default_server;
    include snippets/self-signed.conf;
    include snippets/ssl-params.conf;
    
    root /var/www/html;
    
    index index.php index.html index.htm index.nginx-debian.html;
    
    location = /favicon.ico { log_not_found off; access_log off; }
    location = /robots.txt { allow all; log_not_found off; access_log off; }
    location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {
        expires max;
        log_not_found off;
    }
    
    location / {
        try_files $uri $uri/ /index.php$is_args$args;
    }
    
    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/run/php/php7.0-fpm.sock;
    }
    
    location ~ /\.ht {
        deny all;
    }
}