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A simple forms based password, which the browser remembers via a cookie.

https://www.digitalocean.com/community/tutorials/how-to-set-up-password-authentication-with-nginx-on-ubuntu-22-04

sudo apt install apache2-utils

sudo htpasswd -c /etc/nginx/.htpasswd sammy

sudo vim /etc/nginx/sites-enabled/default

sudo systemctl restart nginx


server {
    listen 80 default_server;

     . . .
   
    auth_basic "Restricted Content";
    auth_basic_user_file /etc/nginx/.htpasswd;
}

Conclusion

A very simple way to get a password on a site. I used this for development where I want some stakeholders to be able to see content but not yet released to the world.