class WebAgent::CookieManager

def find(url)
  return nil if @cookies.empty?
  cookie_list = Array.new
  @cookies.each{|cookie|
    is_expired = (cookie.expires && (cookie.expires < Time.now.gmtime))
    if cookie.use? && !is_expired && cookie.match?(url)
      if cookie_list.select{|c1| c1.name == cookie.name}.empty?
        cookie_list << cookie
      end
    end
  }
  return make_cookie_str(cookie_list)
end