How to generate Grab with own proxies?

Question

Python

There is a task to implement the work of asynchronous Grab::Spider through a proxy.
Now it looks like this
spider.py

from grab import Grab
from grab.spider import Spider, Task

class LinkSpider(Spider):

   def __init__(self, extrapage, homepage):
        super(LinkSpider, self).__init__()
        self.initial_urls = ['some_url']
        self.homepage = homepage
        self.matches = []
        self.OUdict = {}
   def task_initial(self, grab, task):
        do_smthng
        link = 'https://api.ipify.org/?format=json'
        g = Grab(url=link)
        yield Task('parser', grab=g, link=link)
   def task_parser(self,grab,task):
        response = grab.response.body
        print(response)

In this case, everything is done and my current ip is printed to the console.
Now add proxy-setup

from grab import Grab
from grab.spider import Spider, Task

class LinkSpider(Spider):

   def __init__(self, extrapage, homepage):
        super(LinkSpider, self).__init__()
        self.initial_urls = ['some_url']
        self.homepage = homepage
        self.matches = []
        self.OUdict = {}
   def task_initial(self, grab, task):
        do_smthng
        link = 'https://api.ipify.org/?format=json'
        g = Grab()
        g.setup(url=link, proxy="120.52.72.47:80", proxy_type="http")
        yield Task('parser', grab=g, link=link)
   def task_parser(self,grab,task):
        response = grab.response.body
        print(response)

I took proxies from different sites, for example:
So, in the case of such a launch, the first task is called, but it simply doesn’t get into the second one (that is, I don’t see any errors or ip-address in the console, after a couple of seconds the program ends.
Tell me, maybe I I missed something and somewhere it was necessary to make a global setup, did it as it is written in the docks, maybe there is another way, maybe you can do a global setup for all grab objects? elementary
Watson!