class Rack::Protection::CookieTossing

def accepts?(env)
  cookie_header = env['HTTP_COOKIE']
  cookies = Rack::Utils.parse_query(cookie_header, ';,') { |s| s }
  cookies.each do |k, v|
    if (k == session_key && Array(v).size > 1) ||
       (k != session_key && Rack::Utils.unescape(k) == session_key)
      bad_cookies << k
    end
  end
  bad_cookies.empty?
end