Not making list of urls in scrapy spider

I have created a scrapy spider that has to crawl the whole webpage and extract the urls. now I have to remove the social media URL for that I want to make a list of the URLs, but somehow it's not working. when I try to append each URL in list it just continuously make list of urls.

import re
import scrapy
all_urls = []
class QuotesSpider(scrapy.Spider):
    name = 'quotes'

    start_urls = [
            'https://www.wireshark.org/docs/dfref/i/ip.html',
        ]
    def parse(self, response):
        page= response.url.split("/")[-2]
        filename='quotes-%s.html' % page
        with open(filename, 'wb') as f:
            f.write(response.body)
        for r in response.css('a'):
            url = r.css('::attr(href)').get()
            print('all the urls are here', url)
            for i in url:
                all_urls.append(url)
                print(all_urls)

Edit:

I have removed the social media links and other info from the list now I want to scrape each link further kindly see if my approach is fine.

import requests
import scrapy
all_urls = []
remove = ["twitter"]
class QuotesSpider(scrapy.Spider):
    name = 'quotess'
    start_urls = [
            'https://www.wireshark.org/docs/dfref/i/ip.html',
         ]
    def parse(self, response):
        for url in response.css('a::attr(href)').getall():
            if url.startswith("http"):
                if 'twitter' not in url:
                    all_urls.append(url)
        print(all_urls)
        print(all_urls[0])
        for i in all_urls:
            response = requests.get(i)
            # print(response)
            yield response