class Rack::Protection::XSSHeader

xss_mode
How the browser should prevent the attack (default: :block)
Options:
Sets X-XSS-Protection header to tell the browser to block attacks.
More infos
blogs.msdn.com/b/ie/archive/2008/07/01/ie8-security-part-iv-the-xss-filter.aspx<br>Supported browsers
Internet Explorer 8+ and Chrome
Prevented attack

Non-permanent XSS
#

def call(env) 

def call(env)
  status, headers, body = @app.call(env)
  headers['X-XSS-Protection']       ||= "1; mode=#{options[:xss_mode]}" if html? headers
  headers['X-Content-Type-Options'] ||= 'nosniff'                       if options[:nosniff]
  [status, headers, body]
end