ltp is not fetching correctly

@sujith @rakeshr I am trying to get current NIFTY and VIX values. Worked till last friday but started fatching no values from few days. Is anything changed? or Can you correct the code if anything changed?

conn    = http.client.HTTPSConnection("api.kite.trade")
payload = ''
headers = {
	'X-Kite-Version': '3',
	'Authorization' : f'token {api_<code class="CodeInline">key}:{access_token}'
	}

ltp_quote = '/quote?i=NIFTY+50:INDIA+VIX'
conn.request("GET", ltp_quote, payload, headers)
response  = conn.getresponse()
ltp_byte  = response.read()
ltp_info  = json.loads(ltp_byte.decode("utf-8"))
print(ltp_info)

Output:
{'status': 'success', 'data': {}}

API call success but resulted empty dictionary.