python substrate RPC

test_substrate_rpc.py

import requests
import json

#url = "https://substrate-rpc.parity.io/"
url = "http://127.0.0.1:9944/"

headers = {'content-type': 'application/json'}

payload = {
    "method": "chain_getRuntimeVersion",
    "params": None,
    "jsonrpc": "2.0",
    "id": 0,
}
response = requests.post(url, data=json.dumps(payload), headers=headers)

# results in http 400
# substrate log says: 
# 2019-03-24 10:40:46 Accepted a new tcp connection from 127.0.0.1:43476.
# 2019-03-24 10:40:46 WS Error <Protocol>: Unable to parse WebSocket key.