How to call the exception handling middleware in scrapy

import time,random

from scrapy.downloadermiddlewares.retry import RetryMiddleware


class processallexceptionmiddleware(RetryMiddleware):


    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.EXCEPTIONS_TO_RETRY):
            print("")
            -sharp 
            print("Got exception: %s" % (exception))
            -sharp responsespider
            time.sleep(random.randint(3, 5))
            return request


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

        },

after I handled it like this, I didn"t call it and asked for advice. Thank you for using the log function to record the behavior of the crawler

Mar.18,2022
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