[Python] How to send Slack api request to websocket without Bolt or other SDK?

I have the code below. It connects correctly to Slack, and authenticate correctly.

I want to sent a conversations.list request to list the channels. How can I do that without using Bolt or some other SDK? The system where this runs is locked down, so I'm not getting to install anything further than websockets.

I think the only missing part is figuring what to send on the websocket to request a channel list. Currently it outputs:

Opened connection
{"type":"hello","num_connections":1,"debug_info":{"host":"applink-11","build_number":105,"approximate_connection_time":18060},"connection_info":{"app_id":"Redacted"}}


The API I'm after is https://api.slack.com/methods/conversations.list

Code is

#!/usr/bin/env python2.6

import httplib
import requests
import websocket
import argparse

def on_message(ws, message):
print(message)
ws.send("list")

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

def on_close(ws, close_status_code, close_msg):
print("### closed ###")

def on_open(ws):
print("Opened connection")

def run_with(url):
# websocket.enableTrace(True)
ws = websocket.WebSocketApp(url,
on_open=on_open,
on_message=on_message,
on_error=on_error,
on_close=on_close)

ws.run_forever()

def main():

parser = argparse.ArgumentParser()
parser.add_argument("token")
args = parser.parse_args()

url = 'https://slack.com/api/apps.connections.open'
headers = {
'content-type': 'application/x-www-form-urlencoded',
'Authorization': 'Bearer ' + args.token}
r = requests.post(url, headers=headers)

if r.json()['ok']:
url = r.json()['url']
run_with(url)
else:
print(r.content)

if __name__ == '__main__':
main()

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