kept getting redirect errors

What redirect errors?

Anyway, does an example like below, redirect from http://example.com or http://www.example.com to https://example.com or https://www.example.com work for you?

server {
    listen 443 ssl;
    root /var/www/html;
    index index.php;

    server_name www.example.com example.com;
    ....
}

server {
    if ($host = www.example.com) {
        return 301 https://$host$request_uri;
    }

    if ($host = example.com) {
        return 301 https://$host$request_uri;
    }

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