X Frame Options

The X-Frame-Options HTTP response header can be used to indicate whether or not a browser should be allowed to render a page in a , <iframe>, or . Sites can use this to avoid clickjacking attacks, by ensuring that their content is not embedded into other sites.

Links:

• mozilla

PHP / Apache

<IfModule mod_headers.c>
  Header set X-Frame-Options DENY
</IfModule>