add how get ws url

sock.py

import websocket
# pip install websocket-client
import json
try:
    import thread
except ImportError:
    import _thread as thread
import time
import requests
# pip install requests
 
mm = {
    'id': 0,
    'method': 'Log.enable'
}

mm2 = {
    'id': 1,
    'method': 'Network.enable'
}

method_id = 4
requset_dict = dict()
response_dict = dict()
request_id_dict = dict()
response_body_dict = dict()

# http://localhost:9222/json -> webSocketDebuggerUrl
websocket_url = 'ws://localhost:9222/devtools/page/3F16DFD0A8C59E8B860643E970CB2C1B'


def on_message(ws, message):
    ee = json.loads(message)
    # save log(need fix)
    if 'method' in ee and ee['method'] == 'Log.entryAdded':
        eee = ee['params']['entry']
        print('[%s] %s' % (eee['level'], eee['text']))
    # save response
    elif 'method' in ee and ee['method'] == 'Network.responseReceived':
        id = ee['params']['requestId']
        response_dict[id] = ee['params']['response']
        get_response_body(ws, id)
    # save request 
    elif 'method' in ee and ee['method'] == 'Network.requestWillBeSent':
        id = ee['params']['requestId']
        ee['params']['request']['id'] = id
        requset_dict[id] = ee['params']['request']
    # integrate request, response, body
    elif 'id' in ee and 'body' in ee['result']:
        m_id = ee['id']
        request_id = request_id_dict[m_id]
        body = ee['result']['body']
        response_dict[request_id]['body'] = body
        print('--------------------request--------------------')
        print(requset_dict[request_id])
        print('--------------------response--------------------')
        print(response_dict[request_id])
    
        
def get_response_body(ws, request_id):
    global method_id
    method_id += 1

    get_response_body_method = {
        'id' : method_id,
        'method': 'Network.getResponseBody',
        'params': {
            'requestId' : request_id
        }
    }
    ws.send(json.dumps(get_response_body_method))
    request_id_dict[method_id] = request_id


def on_error(ws, error):
    print(error)
 

def on_close(ws):
    print("### closed ###")

    
def on_open(ws):
    def run(*args):
        ws.send(json.dumps(mm))
        time.sleep(1)
        ws.send(json.dumps(mm2))
        time.sleep(1)
     
    thread.start_new_thread(run, ())
 
 
if __name__ == "__main__":
    
    r = requests.get('http://localhost:9222/json')
    dd = r.json()

    websocket_url = dd[0]['webSocketDebuggerUrl']
    
    websocket.enableTrace(True)
    ws = websocket.WebSocketApp(websocket_url,
                              on_message = on_message,
                              on_error = on_error,
                              on_close = on_close)
    ws.on_open = on_open
    ws.run_forever()