class Rack::Protection::EscapedParams

def initialize(*)
  super
  modes       = Array options[:escape]
  @escaper    = options[:escaper]
  @html       = modes.include? :html
  @javascript = modes.include? :javascript
  @url        = modes.include? :url
  if @javascript and not @escaper.respond_to? :escape_javascript
    fail("Use EscapeUtils for JavaScript escaping.")
  end
end