How to prevent search engines from indexing your staging server sites

Here are the configurations to prevent search engines (Google, Bing, etc.) from indexing all sites on your server using global configuration for both web servers Apache and Nginx:

Prevent search engines indexing in Apache

Add the following line in httpd.conf or apache2.conf:

# Global no-index setting
Header always set X-Robots-Tag "noindex, nofollow, noarchive"

Prevent search engines indexing in Nginx

Add the following line in nginx.conf  in the http bloc :

http {
    # Global no-index setting
    add_header X-Robots-Tag "noindex, nofollow, noarchive, nosnippet, noimageindex" always;
    
    # ... other configurations ...
}

Web Servers, Apache and Nginx, must be restarted for changes to take effect.