[QUESTION] Can I connect to an existing browser through cdp using nodriver like in playwright connect_over_cdp?

[juanfrilla]

My goal is to spawn a browser with selenium grid, use the websocket url and connect over cdp (that way I could leverage the nodriver browser patch and the selenium grid infraestructure), is that posible or that could be implemented?
Notice that i am not refering to connecting through the debbuging port, i want to connect through a websocket url:
ws://localhost:4444/session/1234567890abcdef/se/command

Take a look to connect_over_cdp method here:
https://playwright.dev/python/docs/api/class-browsertype
Thanks

[OnlineProxy-io]

Absolutely, you can make that work. I've actually done something similar. When Selenium Grid 4 spins up a Chrome session, it exposes a WebSocket endpoint via the se:cdp capability , something like ws://localhost:4444/session/<session-id>/se/cdp/ws
You can grab that and pass it directly into playwright.chromium.connect_over_cdp(...). Playwright doesn’t care if the browser wasn’t launched by Playwright itself as long as the CDP endpoint speaks the protocol, it works. Just note, this isn't the usual Playwright launch flow, so some features might be limited or behave weirdly. You’re skipping the devtools port (9222), but that’s fine. Selenium’s WebSocket endpoint proxies CDP properly.
So yeah, it’s a pretty solid way to reuse your Grid infra and get Playwright’s speed & flexibility. Not officially documented, but it works.

[juanfrilla]

Thanks but I just did it with playwright, , now I want to connect with nodriver to that websocket endpoint