Почему не работает?

def get_html(url, params=None):
    r = requests.get(url, headers=HEADERS, params=params)
    return r
 
def get_content(html):
    soup = BeautifulSoup(html, 'html.parser')
    items = soup.find_all('ul', class_='header-menu')
 
    marks = []
    for item in items:
        marks.append({
            'title': item.find('a', class_='header-menu__link').get_text()
        })
        print(marks)
 
def parse():
    html = get_html(URL)
    if html.status_code == 200:
        get_content(html.text)
    else:
        print('Error')
 
parse()

import requests
from bs4 import BeautifulSoup
 
URL = '(заполнено)'
HEADERS = {'user-agent': '(заполнено)',
           'accept': '*/*'}
 
def get_html(url, params=None):
    r = requests.get(url, headers=HEADERS, params=params)
    return r
 
def get_content(html):
    soup = BeautifulSoup(html, 'html.parser')
    items = soup.find_all('ul', class_='header-menu')
 
    marks = []
    for item in items:
        marks.append({
            'title': item.find('a', class_='header-menu__link').get_text()
        })
        print(marks)
 
def parse():
    html = get_html(URL)
    if html.status_code == 200:
        get_content(html.text)
    else:
        print('Error')
 
parse()

import requests
from bs4 import BeautifulSoup
 
URL = 'https://www.dns-shop.ru/catalog/17a8a05316404e77/planshety/'
HEADERS = {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:88.0) Gecko/20100101 Firefox/88.0',
           'accept': '*/*'}
 
def get_html(url, params=None):
    r = requests.get(url, headers=HEADERS, params=params)
    return r
 
def get_content(html):
    soup = BeautifulSoup(html, 'html.parser')
    items = soup.find_all('il', class_='catalog-product ui-button-widget')
 
    marks = []
    for item in items:
        marks.append({
            'title': item.find('a', class_='catalog-product__name ui-link ui-link_black').get_text()
        })
        print(marks)
 
def parse():
    html = get_html(URL)
    if html.status_code == 200:
        get_content(html.text)
    else:
        print('Error')
 
parse()