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Scrapy is Visiting same Url despite dont_filter=False


Scrapy is Visiting same Url despite dont_filter=False

By : user2956447
Date : November 22 2020, 10:56 AM
around this issue Scrapy, by default, would append into the output file if it exists. What you see in the output.csv is the results of multiple spider runs. Remove the output.csv before running the spider again.
code :


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scrapy: exceptions.AttributeError: 'unicode' object has no attribute 'dont_filter'

scrapy: exceptions.AttributeError: 'unicode' object has no attribute 'dont_filter'


By : Allyson Aguilar
Date : March 29 2020, 07:55 AM
hope this fix your issue start_requests is supposed to yield individual Request objects, not just individual URLs. But each el in your code is apparently a URL. Try changing
code :
yield el
yield self.make_requests_from_url(el)
Scrapy - Visiting nested links and grabbing meta data from each level

Scrapy - Visiting nested links and grabbing meta data from each level


By : user2958919
Date : March 29 2020, 07:55 AM
How does adding dont_filter=True argument in scrapy.Request make my parsing method to work ?

How does adding dont_filter=True argument in scrapy.Request make my parsing method to work ?


By : rmor84
Date : March 29 2020, 07:55 AM
may help you . Short answer: You are making duplicate requests. Scrapy has built in duplicate filtering which is turned on by default. That's why the parse2 doesn't get called. When you add that dont_filter=True, scrapy doesn't filter out the duplicate requests. So this time the request is processed.
Longer version:
Scrapy Prevent Visiting Same URL Across Schedule

Scrapy Prevent Visiting Same URL Across Schedule


By : user895947
Date : March 29 2020, 07:55 AM
it fixes the issue DeltaFetch is a Scrapy plugin that stores fingerprints of visited URLs across different Spider runs. You can use this plugin for incremental (delta) crawls. Its main purpose is to avoid requesting pages that have been already scraped before, even if it happened in a previous execution. It will only make requests to pages from where no items were extracted before, to URLs from the spiders' start_urls attribute or requests generated in the spiders' start_requests method.
See: https://blog.scrapinghub.com/2016/07/20/scrapy-tips-from-the-pros-july-2016/
Scrapy response 403 set request.dont_filter False

Scrapy response 403 set request.dont_filter False


By : user3551013
Date : March 29 2020, 07:55 AM
wish of those help I'm not sure I understand your use case but to answer your question: you can reschedule a request in downloader middleware. Make sure it's priority is high in your settings and in process_response return a new modified request:
code :
def process_response(self, request, response, spider):
    if response.status == 403:
        print(request.url,"expired cookie")
        request.dont_filter=True
        return request
    return response
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