Get Websocket messages with Selenium or any way to capture web socket message with python?

You can use the 'pyppeteer' library for this

import asyncio
from pyppeteer import launch
 
 
async def main():
    browser = await launch(
        headless=False,
        args=['--no-sandbox'],
        autoClose=False
    )
    page = await browser.newPage()
    await page.goto('https://example.com')
    cdp = await page.target.createCDPSession()
    await cdp.send('Network.enable')
    await cdp.send('Page.enable')
    def printResponse(response):
        print(response)
 
    cdp.on('Network.webSocketFrameReceived', printResponse) # Calls printResponse when a websocket is received
    cdp.on('Network.webSocketFrameSent', printResponse) # Calls printResponse when a websocket is sent
    await asyncio.sleep(2000)
 
 
asyncio.get_event_loop().run_until_complete(main())