dont filter= true in scrapy

yield scrapy.Request(self.start_urls[0],callback=self.parse2,dont_filter=True)

Here is what the above code is Doing:
1. We are using the scrapy.Request function to make a request to the first URL in our start_urls list.
2. We are using the callback argument to tell scrapy what function to call when it receives a response from the server.
3. We are using the dont_filter argument to tell scrapy not to filter this request (more on this later).