[Python] Nse india Web scrapping not working, response showing error code 401

I am trying to web scrap data from nse india website.I am attaching the code below.

import requests

import json

import time

def fun(sym):

headers = {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; '
'x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36'} # Chrome/79.0.3945.117

main_url = "https://www.nseindia.com/"

response = requests.get(main_url, headers=headers)

cookies = response.cookies

url = "https://www.nseindia.com/api/option-chain-equities?symbol=" + sym

session = requests.Session()

request = session.get(url, headers=headers)

response = session.get(url, headers=headers).text

data = json.loads(response)

print(data)


if name == "main":

sym = 'ABB'
fun(sym)


the print(data) is showing some error.

The same code was working 2 weeks before but not working now. Can anyone let me know how to solve this issue? Thanks

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