loop do
  response.sync_body 5
  xpath("//a[img[@class='fzg_bild']]").each do |item|
    category = xpath("//h2[@class='fzg_kategorie']").text.strip
      yield request(url: item[:href], callback: :parse_listing, data: { categories: category })
    end
  page.find(:xpath, "//li[@class='pagination-next']/a").trigger("click") rescue break
end