请教各位，python编写爬虫，返回http error 521怎么解决
的有关信息介绍如下：
原博主用的是PyV8执行JS代码，我换了PyExecJSimport execjsimport reimport requestsurl = ""HERDERS = {"Host": "www.kuaidaili.com",'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.87 Safari/537.36',}def executejs(html):# 提取其中的JS加密函数js_string = ''.join(re.findall(r'(function .*?)',html))# 提取其中执行JS函数的参数js_func_arg = re.findall(r'setTimeout\(\"\D+\((\d+)\)\"', html)[0]js_func_name = re.findall(r'function (\w+)',js_string)[0]# 修改JS函数，使其返回Cookie内容js_string = js_string.replace('eval("qo=eval;qo(po);")', 'return po')func = execjs.compile(js_string)return func.call(js_func_name,js_func_arg)def parse_cookie(string):string = string.replace("document.cookie='", "")clearance = string.split(';')[0]return {clearance.split('=')[0]: clearance.split('=')[1]}# 第一次访问获取动态加密的JSfirst_html = requests.get(url=url,headers=HERDERS).content.decode('utf-8')# 执行JS获取Cookiecookie_str = executejs(first_html)# 将Cookie转换为字典格式cookie = parse_cookie(cookie_str)print('cookies = ',cookie)# 带上cookies参数，再次请求response = requests.get(url=url,headers=HERDERS,cookies=cookie)print(response.status_code)
