Scrapy does not call fault-tolerant processallexceptionmiddleware

 from twisted.internet import defer
    from twisted.internet.error import TimeoutError, DNSLookupError, \
        ConnectionRefusedError, ConnectionDone, ConnectError, \
        ConnectionLost, TCPTimedOutError
    from twisted.web.client import ResponseFailed
    from scrapy.core.downloader.handlers.http11 import TunnelError
    import time
    
    
    class processallexceptionmiddleware(object):
        ALL_EXCEPTIONS = (defer.TimeoutError, TimeoutError, DNSLookupError,
                          ConnectionRefusedError, ConnectionDone, ConnectError,
                          ConnectionLost, TCPTimedOutError, ResponseFailed,
                          IOError, TunnelError)
    
        def process_response(self, request, response, spider):
            -sharp 40x/50xresponse
            if str(response.status).startswith("4") or str(response.status).startswith("5")or str(response.status).startswith("3"):
                print("45 3")
                return request
            if "forbidden" in response.url:
                return request
            return response
    
    
    
        def process_exception(self, request, exception, spider):
            -sharp 
            if isinstance(exception, self.ALL_EXCEPTIONS):
                -sharp 
                print("Got exception: %s" % (exception))
                -sharp responsespider
                time.sleep(5)
                return request


 cu

    stom_settings = {
            "RANDOM_DELAY": 20,
            "DOWNLOADER_MIDDLEWARES": {
                "Espider.middlewares.proxymiddleware.proxy_middleware": 543,
                "Espider.middlewares.processallexceptionmiddleware.processallexceptionmiddleware":544
 }

excuse me, I wrote a fault-tolerant processallexceptionmiddleware in spider. Why didn"t I call this middleware?
the error is as follows

Traceback (most recent call last):
161697 File "/ home/shenjianlin/.local/lib/python3.4/site-packages/twisted/internet/defer.py", line 1384, in _ inlineCallbacks
161698 result = result.throwExceptionIntoGenerator (g)
161699 File "/ home/shenjianlin/.local/lib/python3.4/site-packages/twisted/python/failure.py", line 422, in throwExceptionIntoGenerator
161700 return g.throw (self.type, self.value, Self.tb)
161701 File "/ home/shenjianlin/.local/lib/python3.4/site-packages/scrapy/core/downloader/middleware.py", line 43, in process_request
161702 defer.returnValue ((yield download_func (request=request,spider=spider)
161703 File "/ home/shenjianlin/.local/lib/python3.4/site-packages/twisted/internet/defer.py", line 653, in _ runCallbacks
161704 current.result = callback (current.result, args,) * kw)
161705 File "/ home/shenjianlin/.local/lib/python3.4/site-packages/scrapy/core/downloader/handlers/http11.py", line 351, in _ cb_timeout
161706 raise TimeoutError ("Getting% s took longer than% s seconds."% (url, Timeout))
161707 twisted.internet.error.TimeoutError: User timeout caused connection failure: Getting https://www.lagou.com/gongsi/. took longer than 180.0 seconds..
161708
161709 During handling of the above exception, another exception occurred:
161710
161711 Traceback (most recent call last):
161712 File" / home/shenjianlin/.local/lib/python3.4/site-packages/twisted/internet/defer.py ", line 1386, In _ inlineCallbacks
161713 result = g.send (result)
161714 File "/ home/shenjianlin/.local/lib/python3.4/site-packages/scrapy/core/downloader/middleware.py", line 66, in process_exception
161715 spider=spider)
161716 File "/ home/shenjianlin/.local/lib/python3.4/site-packages/scrapy/downloadermiddlewares/retry.py", line 61, in process_exception
161717 return self._retry (request, exception, Spider)
161718 File "/ home/shenjianlin/.local/lib/python3.4/site-packages/scrapy/downloadermiddlewares/retry.py", line 71, in _ retry
161719 stats = spider.crawler.stats
161720 AttributeError: "lagou" object has no attribute" crawler"

there is a timeout error here, and the statement from my timeout is not printed

Python

Mar.18,2022