poloniex api recaptcha

import time
import json
import urllib, http.client
import hmac, hashlib

from urllib.parse import urlparse, urlencode

class Poloniex():

    public_methods = [
                'returnTicker',
                'return24hVolume',
                'returnOrderBook',
                'returnTradeHistory',
                'returnChartData',
                'returnCurrencies',
                'returnLoanOrders'
    ]
    
    def __init__(self, API_KEY, API_SECRET):
        self.API_KEY = API_KEY
        self.API_SECRET = bytearray(API_SECRET, encoding='utf-8')
    
    def __getattr__(self, name):
        def wrapper(*args, **kwargs):
            method = 'public' if name in self.public_methods else 'tradingApi'
            kwargs.update(method=method, command=name)
            return self.call_api(**kwargs)
        return wrapper
    
    def call_api(self, **kwargs):
        api_url='https://poloniex.com/'+kwargs['method']
       
        if kwargs['method'] == 'public':
            api_url += '?'+urlencode(kwargs)
            http_method="GET"
        else:
            http_method="POST"

        time.sleep(0.2) # По правилам биржи нельзя больше 6 запросов в секунду
        payload = {'nonce': int(round(time.time()*1000))}

        if kwargs:
            payload.update(kwargs)
            
        payload =  urllib.parse.urlencode(payload)

        H = hmac.new(key=self.API_SECRET, digestmod=hashlib.sha512)
        H.update(payload.encode('utf-8'))
        sign = H.hexdigest()

        headers = {"Content-type": "application/x-www-form-urlencoded",
               "Key":self.API_KEY,
               "Sign":sign}

        url_o = urlparse(api_url)
        conn = http.client.HTTPSConnection(url_o.netloc)
        conn.request(http_method, api_url, payload, headers)
        response = conn.getresponse().read()

        conn.close()
 
        try:
            obj = json.loads(response.decode('utf-8'))

            if 'error' in obj and obj['error']:
                raise Exception(obj['error'])
            return obj
        except ValueError: 
            raise Exception('Получены некорректные данные (проверьте, правильно ли указан метод API {api_method})'.format(api_method=kwargs['command']))
            
            
            ####
            my_polo = Poloniex(
  API_KEY = '',
  API_SECRET = ''
)

ticker = my_polo.returnTicker()
print('TICKER', ticker)
#### return: 
---------------------------------------------------------------------------
JSONDecodeError                           Traceback (most recent call last)
<ipython-input-2-099bfb0a7c1c> in call_api(self, **kwargs)
     63         try:
---> 64             obj = json.loads(response.decode('utf-8'))
     65 

D:\ProgramData\Anaconda3\lib\json\__init__.py in loads(s, encoding, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
    353             parse_constant is None and object_pairs_hook is None and not kw):
--> 354         return _default_decoder.decode(s)
    355     if cls is None:

D:\ProgramData\Anaconda3\lib\json\decoder.py in decode(self, s, _w)
    338         """
--> 339         obj, end = self.raw_decode(s, idx=_w(s, 0).end())
    340         end = _w(s, end).end()

D:\ProgramData\Anaconda3\lib\json\decoder.py in raw_decode(self, s, idx)
    356         except StopIteration as err:
--> 357             raise JSONDecodeError("Expecting value", s, err.value) from None
    358         return obj, end

JSONDecodeError: Expecting value: line 1 column 1 (char 0)

During handling of the above exception, another exception occurred:

Exception                                 Traceback (most recent call last)
<ipython-input-3-0383b65e3ebe> in <module>()
      4 )
      5 
----> 6 ticker = my_polo.returnTicker()
      7 print('TICKER', ticker)

<ipython-input-2-099bfb0a7c1c> in wrapper(*args, **kwargs)
     26             method = 'public' if name in self.public_methods else 'tradingApi'
     27             kwargs.update(method=method, command=name)
---> 28             return self.call_api(**kwargs)
     29         return wrapper
     30 

<ipython-input-2-099bfb0a7c1c> in call_api(self, **kwargs)
     68             return obj
     69         except ValueError:
---> 70             raise Exception('Получены некорректные данные (проверьте, правильно ли указан метод API {api_method})'.format(api_method=kwargs['command']))

Exception: Получены некорректные данные (проверьте, правильно ли указан метод API returnTicker)