Server config rules for set X-Robot-Tags

.htaccess

# For Apache, Litespeed

<Files ~ "\.(pdf|doc|docx|xls|xlsx|ppt|pptx)$"> 
  Header set X-Robots-Tag "noindex, nofollow" 
</Files>

domain.com.conf

# nginx domain config
# example path: /etc/nginx/conf.d/domain.com.conf

server {
  # Set X-Robots-Tag cho các file văn bản
  location  ~* \.(pdf|docx|doc|xls|xlsx|ppt|pptx)$ {
    add_header  X-Robots-Tag "noindex, nofollow, nosnippet, noarchive";
  }
}