Scrapy / Selenium -响应url未传递到web浏览器

from scrapy import signals
from scrapy.http import HtmlResponse
from selenium import webdriver

class SeleniumMiddleware(object):
    @classmethod
    def from_crawler(cls, crawler):
        middleware = cls()
        crawler.signals.connect(middleware.spider_opened, signal=signals.spider_opened)
        crawler.signals.connect(middleware.spider_closed, signal=signals.spider_closed)
        return middleware

    def spider_opened(self, spider):
        self.driver = webdriver.Chrome()  # 使用Chrome浏览器，需要安装ChromeDriver
        self.driver.set_page_load_timeout(10)

    def spider_closed(self, spider):
        self.driver.quit()

    def process_request(self, request, spider):
        self.driver.get(request.url)
        body = self.driver.page_source.encode('utf-8')
        return HtmlResponse(self.driver.current_url, body=body, encoding='utf-8', request=request)

DOWNLOADER_MIDDLEWARES = {
    'your_project_name.middlewares.SeleniumMiddleware': 543,
}