How to restart a task in grab:spider?

Question

Python

Sometimes it happens that when I just start the spider, it apparently uses a rotten proxy and gets the wrong page content. That is, the response header says 200, that's for sure, but the content itself is incorrect. Because I can define it in code, then I thought why don't I repeat the request. I just don't know how to do it. The code:

class ExampleSpider(Spider):
  initial_urls = ['http://www.supertrike.ru/shop/']
  
  def create_grab_instance(self):
    g = Grab(
      connect_timeout=6,
            timeout=8
            )
    g.proxylist.load_url('http://127.0.0.1:7777/proxy.txt')
    return g
  
  # Функция prepare вызываетя один раз перед началом
  def prepare(self):
    self.result_file = csv.writer(open('result.txt', 'w'))
    
  def task_initial(self, grab, task):
    print('Собераю ссылки на категории')
    cats=[a.text() for a in grab.doc.select('//ul[@class="menu vmLinkMenu"]//li//@href').selector_list][:-1]
    print('КАТЕГОРИИ: %s' % '\n'.join(cats))
    if not cats:
      Task('initials', url=self.initial_urls[0]) #Тут я сделал глупую попытку решить проблему, которая почему-то не сработала((
    for cat_url in cats:
      print('-%s' % cat_url)
      yield Task('category', url='http://www.supertrike.ru%s?limitstart=0&limit=65535s' % cat_url)
  
  def task_category(self, grab, task):
    #print('Собераю ссылки на товары')
    for prod_url in [a.text() for a in grab.doc.select('//div[@class="bp_product_details"]/a/@href').selector_list]:
      yield Task('product', url='http://www.supertrike.ru%s' % prod_url)
    
  def task_product(self, grab, task):
    ims = [a.text() for a in grab.doc.select("//div[@class='contentp left_top_box']//*//a/./img/../@href").selector_list]
    images = []
    for i, im in enumerate(ims):#Удаляем повторы (костыль, нужен из-за несовершенного xpath'а)
      if im in images[:i]:
        continue
      else:
        images.append(im)
    i=0
    while i < len(images):
      if not 'supertrike.ru' in images[i]:
        images[i] = 'http://supertrike.ru%s' % images[i]
      i+=1
    
    price = None
    try:
      price = grab.doc.select('//div[@class="product_price_box"]//span[@class="productPrice"]').text()
    except:
      pass
    
    images_fnames = []
    
    category=''
    try:
      category=grab.doc.select('//div[@class="cbwrap"]//*//span[2]//a').text()
    except:
      category=''
    descr=grab.doc.select('//div[@class="contentp right_top_box"]/div')
    title=grab.doc.select('//h1')
    product = [
      task.url, #Ссылка на товар
      category, #Категория
      descr.text() if descr else '', #Описание
      title.text() if title else '', #Заголовок
      re.search('([ 0987654321]*)', price).group(0).replace(' ', '') if price else None, #Цена
      ','.join(images) if images else ''#Картинки
    ]
    i = 0
    while i < len(product):
      product[i] = product[i]
      i += 1
    self.result_file.writerow(product)
    print('Saved %s' % product[1])
    

if __name__ == '__main__':
  bot = ExampleSpider(
      thread_number=2,
      network_try_limit=10
    )
  bot.run()

Here is what he writes