needing help to simulate an xhr request

问题

I need to scrape a website with a "load more button". This is my spider code written in Python:

import scrapy
import json
import requests
import re
from parsel import Selector
from scrapy.selector import Selector 
from scrapy.http import HtmlResponse

headers = {
'origin': 'https://www.tayara.tn',
'accept-encoding': 'gzip, deflate, br',
'accept-language': 'en-US,en;q=0.9',
'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36',
'content-type': 'application/json',
'accept': '*/*',
'referer': 'https://www.tayara.tn/sc/immobilier/bureaux-et-plateaux',
'authority': 'www.tayara.tn',
'dnt': '1',
}
data = '{"query":"query ListingsPage($page: Page, $filter: SearchFilter, $sortBy: SortOrder) {\\n  listings: searchAds(page: $page, filter: $filter, sortBy: $sortBy) {\\n    items {\\n      uuid\\n      title\\n      price\\n      currency\\n      thumbnail\\n      createdAt\\n      category {\\n        id\\n        name\\n        engName\\n        __typename\\n      }\\n      user {\\n        uuid\\n        displayName\\n        avatar(width: 96, height: 96) {\\n          url\\n          __typename\\n        }\\n        __typename\\n      }\\n      __typename\\n    }\\n    trackingInfo {\\n      transactionId\\n      listName\\n      recommenderId\\n      experimentId\\n      variantId\\n      __typename\\n    }\\n    totalCount\\n    pageInfo {\\n      startCursor\\n      hasPreviousPage\\n      endCursor\\n      hasNextPage\\n      __typename\\n    }\\n    __typename\\n  }\\n}\\n","variables":{"page":{"count":36,"offset":"cDEwbg==.MjAxOC0xMi0wMlQxMzo1MDoxMlo=.MzY="},"filter":{"queryString":null,"category":"140","regionId":null,"attributeFilters":[]},"sortBy":"CREATED_DESC"},"operationName":"ListingsPage"}'

class Tun(scrapy.Spider):

name="tayaracommercial"
start_urls = [
    'https://www.tayara.tn/sc/immobilier/bureaux-et-plateaux'
    ]

def parse(self, response):        
    yield Request('https://www.tayara.tn/graphql', method='post', headers=headers, body=data, self.parse_item)


def parse_item(self, response):

    source = 'Tayara'        
    reference = response.url.split('//')[1].split('/')[3]
    titre = response.xpath('//h1[@data-name="adview_title"]/text()').extract()   

    yield{'Source':source, 'Reference':reference, 'Titre':titre}

This is my modest trial. I know that is false. can you correct me please ?

来源：https://stackoverflow.com/questions/54171736/needing-help-to-simulate-an-xhr-request