Documentations and helpful articles
We don't use Apache, so it is necessary to set HTTP - authorization in Nginx. Config Nginx can be edited via "Nginx editor". For activation of HTTP - authorization, it is necessary to add the following lines to the needed block "location":
auth_basic "closed site"; auth_basic_user_file {path to .htpasswd};
Where,
Config example:
location / { auth_basic "closed site"; auth_basic_user_file /home/{username}/domains/{parent_domain}/.htpasswd; }