请求中加上headers后soup.find_all返回空列表

今天在写一个爬虫程序
最开始我能爬取到数据，代码如下

# 爬取帖子列表信息
def getData(baseurl):
    datalist = []
    # 末尾页2985
    for i in range(0,1):
        # 帖子列表地址
        url = baseurl + str(i*50)
        soup = askURL(url)
        print(soup)
 
        # 逐一解析数据
        for item in soup.find_all('li',class_="j_thread_list clearfix thread_item_box"):
            # 保存一个帖子的信息
            data = []
            item = str(item)
 
            replyNum = re.findall(findReplyNum,item)[0]
            data.append(replyNum)                           # 添加评论数
 
            title = re.findall(findTitle,item)[0]
            data.append(title)                              # 添加帖子名称
 
            link = re.findall(findLink,item)[0]
            link = "https://tieba.baidu.com/" + link        # 拼接为完整链接
            data.append(link)                               # 添加链接
 
            datalist.append(data)
    return datalist
 
# 得到一个指定URL的网页内容
def askURL(url):
    html = requests.get(url,verify=False)
    soup = BeautifulSoup(html.content, 'html.parser')
    return soup

但后来应该是我的IP被锁，运行后爬取得到的soup是网络不给力的页面。

html>
 
<html lang="zh-CN">
<head>
<meta charset="utf-8"/>
<title>百度安全验证title>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type"/>
<meta content="yes" name="apple-mobile-web-app-capable"/>
<meta content="black" name="apple-mobile-web-app-status-bar-style"/>
<meta content="width=device-width, user-scalable=no, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0" name="viewport"/>
<meta content="telephone=no, email=no" name="format-detection"/>
<link href="https://www.baidu.com/favicon.ico" rel="shortcut icon" type="image/x-icon"/>
<link href="https://www.baidu.com/img/baidu.svg" mask="" rel="icon" sizes="any"/>
<meta content="IE=Edge" http-equiv="X-UA-Compatible"/>
<meta content="upgrade-insecure-requests" http-equiv="Content-Security-Policy"/>
<link href="https://ppui-static-wap.cdn.bcebos.com/static/touch/css/api/mkdjump_aac6df1.css" rel="stylesheet">
link>head>
<body>
<div class="timeout hide">
<div class="timeout-img">div>
<div class="timeout-title">网络不给力，请稍后重试div>
<button class="timeout-button" type="button">返回首页button>
div>
<div class="timeout-feedback hide">
<div class="timeout-feedback-icon">div>
<p class="timeout-feedback-title">问题反馈p>
div>
<script src="https://wappass.baidu.com/static/machine/js/api/mkd.js">script>
<script src="https://ppui-static-wap.cdn.bcebos.com/static/touch/js/mkdjump_db105ab.js">script>
body>
html>

于是我伪装了一个请求头

head = {
   "User-Agent":...
   "Cookie":...
}
html = requests.get(url,verify=False,headers=head)

这时soup中有完整的页面类容，但soup.find_all就成了一个空列表。
请问有朋友知道怎么解决吗，为什么不加headers时soup.find_all就是正常的

说明您设置的这个j_thread_list clearfix thread_item_box值不正确，当获取不正常的时候有这个值，获取正常的时候没有这个个值，建议重新定位下元素。以及在获取到的页面内容中查找下j_thread_list clearfix thread_item_box这个值是否真的存在。获取到的和你在网页上看到的还是有区别的，有的时候。望采纳

import requests
from lxml import etree

name='python'
url=f'https://tieba.baidu.com/f?ie=utf-8&kw={name}&fr=search'
url2='https://tieba.baidu.com'
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36'
}
dd=requests.get(url,headers)
html = etree.HTML(dd.text)
titles = html.xpath('//*[@class="threadlist_title pull_left j_th_tit "]/a')
reply = html.xpath('//*[@title="回复"]//text()')
data=[]
for n,i in enumerate(titles):
    title=i.xpath('.//text()')[0].strip()
    href=i.xpath('./@href')[0]
    df={'title':title,'href':f"{url2}{href}",'回复':reply[n+1]}
    data.append(df)
    print(f"{n+1}.标题:{title}\n   链接:{url2}{href}\n   回复:{reply[n+1]}")

img