Clickjacking
Internet Explorer 8, Firefox 3.6.9, Opera 10.50, Safari 4.0, Chrome 4.1.249.1042 and later
developer.mozilla.org/en/The_X-FRAME-OPTIONS_response_header
Sets X-Frame-Options header to tell the browser avoid embedding the page in a frame.
Options:
Defines who should be allowed to embed the page in a frame. Use :deny to forbid any embedding, :sameorigin to allow embedding from the same origin (default).
# File lib/rack/protection/frame_options.rb, line 22 def header @header ||= begin frame_options = options[:frame_options] frame_options = options[:frame_options].to_s.upcase unless frame_options.respond_to? :to_str { 'X-Frame-Options' => frame_options.to_str } end end