# pip install -U requests
import requests
url = 'https://www.allonpage.com/'
r = requests.get(url)
print(r.request.headers)
'''
run:
{'User-Agent': 'python-requests/2.20.1', 'Accept': '*/*',
'Accept-Encoding': 'gzip, deflate', 'Connection': 'keep-alive'}
'''