Curl gives response but python does not and the request call does not terminate? - python-3.x

Question

I am trying this following curl request
curl 'https://www.nseindia.com/api/historical/cm/equity?symbol=COALINDIA&series=\[%22EQ%22\]&from=03-05-2020&to=03-05-2021&csv=true' \
-H 'authority: www.nseindia.com' \
-H 'accept: */*' \
-H 'user-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko)
Chrome/88.0.4324.182 Safari/537.36' \
-H 'x-requested-with: XMLHttpRequest' \
-H 'sec-gpc: 1' \
-H 'sec-fetch-site: same-origin' \
-H 'sec-fetch-mode: cors' \
-H 'sec-fetch-dest: empty' \
-H 'referer: https://www.nseindia.com/get-quotes/equity?symbol=COALINDIA' \
-H 'accept-language: en-GB,en-US;q=0.9,en;q=0.8' \
-H 'cookie: ak_bmsc=2D5CCD6F330B77016DD02ADFD8BADB8A58DDD69E733C0000451A9060B2DF0E5C~pllIy1yQvFABwPqSfaqwV4quP8uVOfZBlZe9dhyP7+7vCW/YfXy32hQoUm4wxCSxUjj8K67PiZM+8wE7cp0WV5i3oFyw7HRmcg22nLtNY4Wb4xn0qLv0kcirhiGKsq4IO94j8oYTZIzN227I73UKWQBrCSiGOka/toHASjz/R10sX3nxqvmMSBlWvuuHkgKOzrkdvHP1YoLPMw3Cn6OyE/Z2G3oc+mg+DXe8eX1j8b9Hc=; nseQuoteSymbols=[{"symbol":"COALINDIA","identifier":null,"type":"equity"}]; nsit=X5ZCfROTTuLVwZzLBn7OOtf0; AKA_A2=A; bm_mi=6CE0B82205ACE5A1F72250ACDDFF563E~LZ4/HQ257rSMBPCrxy0uSDvrSxj4hHpLQqc8R5JZOzUZYo1OqZg5Q/GOt88XNtMbsWM8bB22vtCXzvksGwPcC/bH2nPFEZr0ci6spQ4GOpCa/TM7soc02HVf0tyDTkmg/ZdLZlWzond4r0vn+QpSB7f3fiVza1Gdx9OaFL1i3rvqe1OKmFONreHEue20PL0hlREVWeLcFM/5DxKArPwzCSopPp62Eea1510iivl7GmY=; nseappid=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJhcGkubnNlIiwiYXVkIjoiYXBpLm5zZSIsImlhdCI6MTYyMDA2MTQ5OSwiZXhwIjoxNjIwMDY1MDk5fQ.YBTQ0MqRayD3QBM3V6zUt5zbRRICkbIhWWNedkDYrdU; bm_sv=C49B743B48F174C77F3DDAD188AA6D87~bm5TD36snlaRLx9M5CS+FOUicUcbVV3OIKjZU2WLwd1PtHYUum7hnBfYeUCDv+5Xdb9ADklnmm1cwZGJJbiBstcA6c5vju53C7aTFBorl8SJZjBN/4ku61oz0ncrQYCaSxkFGkRRY9VMWm6SpQwHXfMsUzc/Qk7301zs7KZuGCY=' \
--compressed
This gives us the required response (example below)
"Date ","series ","OPEN ","HIGH ","LOW ","PREV. CLOSE ","ltp ","close ","vwap ","52W H","52W L ","VOLUME ","VALUE ","No of trades "
"03-May-2021","EQ","133.00","133.45","131.20","133.05","132.20","132.20","132.21","163.00","109.55",10262391,"1,356,811,541.80",59409
But if I use the following python script to get the data
import requests
headers = {
'authority': 'www.nseindia.com',
'accept': '*/*',
'user-agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.182 Safari/537.36',
'x-requested-with': 'XMLHttpRequest',
'sec-gpc': '1',
'sec-fetch-site': 'same-origin',
'sec-fetch-mode': 'cors',
'sec-fetch-dest': 'empty',
'referer': 'https://www.nseindia.com/get-quotes/equity?symbol=COALINDIA',
'accept-language': 'en-GB,en-US;q=0.9,en;q=0.8','cookie':'ak_bmsc=2D5CCD6F330B77016DD02ADFD8BADB8A58DDD69E733C0000451A9060B2DF0E5C~pllIy1yQvFABwPqSfaqwV4quP8uVOfZBlZe9dhyP7+7vCW/YfXy32hQoUm4wxCSxUjj8K67PiZM+8wE7cp0WV5i3oFyw7HRmcg22nLtNY4Wb4xn0qLv0kcirhiGKsq4IO94j8oYTZIzN227I73UKWQBrCSiGOka/toHASjz/R10sX3nxqvmMSBlWvuuHkgKOzrkdvHP1YoLPMw3Cn6OyE/Z2G3oc+mg+DXe8eX1j8b9Hc=; nseQuoteSymbols=[{"symbol":"COALINDIA","identifier":null,"type":"equity"}]; nsit=X5ZCfROTTuLVwZzLBn7OOtf0; AKA_A2=A; bm_mi=6CE0B82205ACE5A1F72250ACDDFF563E~LZ4/HQ257rSMBPCrxy0uSDvrSxj4hHpLQqc8R5JZOzUZYo1OqZg5Q/GOt88XNtMbsWM8bB22vtCXzvksGwPcC/bH2nPFEZr0ci6spQ4GOpCa/TM7soc02HVf0tyDTkmg/ZdLZlWzond4r0vn+QpSB7f3fiVza1Gdx9OaFL1i3rvqe1OKmFONreHEue20PL0hlREVWeLcFM/5DxKArPwzCSopPp62Eea1510iivl7GmY=; nseappid=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJhcGkubnNlIiwiYXVkIjoiYXBpLm5zZSIsImlhdCI6MTYyMDA2MTQ5OSwiZXhwIjoxNjIwMDY1MDk5fQ.YBTQ0MqRayD3QBM3V6zUt5zbRRICkbIhWWNedkDYrdU; bm_sv=C49B743B48F174C77F3DDAD188AA6D87~bm5TD36snlaRLx9M5CS+FOUicUcbVV3OIKjZU2WLwd1PtHYUum7hnBfYeUCDv+5Xdb9ADklnmm1cwZGJJbiBstcA6c5vju53C7aTFBorl8SJZjBN/4ku61oz0ncrQYCaSxkFGkRRY9VMWm6SpQwHXfMsUzc/Qk7301zs7KZuGCY=',}
params = (
('symbol', 'COALINDIA'),
('series', '/["EQ"/]'),
('from', '30-04-2021'),
('to', '03-05-2021'),
('csv', 'true'),
)
response = requests.get('https://www.nseindia.com/api/historical/cm/equity', headers=headers, params=params)
It gets stuck in the last line.
I am using python3.9 and urllib3.
Not sure what is the problem.
This url downloads a csv file from the website.

Answer 1

You have to jump through some loops with Python to get the file you're after. Mainly, you need to get the request header cookie part right, otherwise you'll keep getting 401 code.
First, you need to get the regular cookies from the authority www.nseindia.com. Then, you need to get the bm_sv cookie from the https://www.nseindia.com/json/quotes/equity-historical.json. Finally, add something that's called nseQuoteSymbols.
Glue all that together and make the request to get the file.
Here's how:
from urllib.parse import urlencode
import requests
headers = {
'user-agent': 'Mozilla/5.0 (X11; Linux x86_64) '
'AppleWebKit/537.36 (KHTML, like Gecko) '
'Chrome/88.0.4324.182 Safari/537.36',
'x-requested-with': 'XMLHttpRequest',
'referer': 'https://www.nseindia.com/get-quotes/equity?symbol=COALINDIA',
}
payload = {
"symbol": "COALINDIA",
"series": '["EQ"]',
"from": "04-04-2021",
"to": "04-05-2021",
"csv": "true",
}
api_endpoint = "https://www.nseindia.com/api/historical/cm/equity?"
nseQuoteSymbols = 'nseQuoteSymbols=[{"symbol":"COALINDIA","identifier":null,"type":"equity"}]; '
def make_cookies(cookie_dict: dict) -> str:
return "; ".join(f"{k}={v}" for k, v in cookie_dict.items())
with requests.Session() as connection:
authority = connection.get("https://www.nseindia.com", headers=headers)
historical_json = connection.get("https://www.nseindia.com/json/quotes/equity-historical.json", headers=headers)
bm_sv_string = make_cookies(historical_json.cookies.get_dict())
cookies = make_cookies(authority.cookies.get_dict()) + nseQuoteSymbols + bm_sv_string
connection.headers.update({**headers, **{"cookie": cookies}})
the_real_slim_shady = connection.get(f"{api_endpoint}{urlencode(payload)}")
csv_file = the_real_slim_shady.headers["Content-disposition"].split("=")[-1]
with open(csv_file, "wb") as f:
f.write(the_real_slim_shady.content)
Output -> a .csv file that looks like this: