How To Permanetly Redirect To WWW On NGINX?

Head to your domains configuration (most likely /etc/nginx/sites-available), than create a file named example.com and inside put the following context:

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

And configure www.example.com in another file with the normal configuration.

Good luck.

You don’t necessarily need to redirect. A rewrite will also work. Just add another server block to the config file for the domain.

 server {
    listen 80;
    server_name bedom.com;
    rewrite ^(.*)$ $scheme://www.bedom.com$1;
  }