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import requests
import base64

S = requests.session()

req = S.get(url='http://123.206.87.240:8002/web6/')
flagInHeader = req.headers['flag']

flag_decode = base64.b64decode(flagInHeader).decode()
print(flag_decode)
flag_data = base64.b64decode(flag_decode.split(':')[1][1:])
print(flag_data)

post_data = {'margin':flag_data}
get_flag = S.post(url='http://123.206.87.240:8002/web6/',data=post_data)
print(get_flag.text)