Unable to send requests in the right way after replacing redirected url with original one using middleware

I've created a script using scrapy to fetch some fields from a webpage. The url of the landing page and the urls of inner pages get redirected very often, so I created a middleware to handle that redirection. However, when I came across this post, I could understand that I need to return request in process_request() after replacing the redirected url with the original one.

This is meta={'dont_redirect': True,"handle_httpstatus_list": [301,302,307,429]} always in place when the requests are sent from the spider.

As all the requests are not being redirected, I tried to replace the redirected urls within _retry() method.

def process_request(self, request, spider):
    request.headers['User-Agent'] = self.ua.random

def process_exception(self, request, exception, spider):
    return self._retry(request, spider)

def _retry(self, request, spider):
    request.dont_filter = True
    if request.meta.get('redirect_urls'):
        redirect_url = request.meta['redirect_urls'][0]
        redirected = request.replace(url=redirect_url)
        redirected.dont_filter = True
        return redirected
    return request

def process_response(self, request, response, spider):
    if response.status in [301, 302, 307, 429]:
        return self._retry(request, spider)
    return response

Question: How can I send requests after replacing redirected url with original one using middleware?

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