Unable to run in headless=False mode due to pyppeteer.errors.NetworkError: Protocol error Page.getFrameTree: Target closed.

[BhavyaLight]

import asyncio
from pyppeteer import launch

async def main():
    browser = await launch(headless=False)
    page = await browser.newPage()
    
asyncio.get_event_loop().run_until_complete(main())

pyppeteer version 1.0.2

pyppeteer.errors.NetworkError: Protocol error Page.getFrameTree: Target closed.
connection unexpectedly closed
Task exception was never retrieved
future: <Task finished name='Task-22' coro=<Connection._async_send() done, defined at /Users/peurrr/Desktop/sample/env/lib/python3.9/site-packages/pyppeteer/connection.py:69> exception=InvalidStateError('invalid state')>
Traceback (most recent call last):
  File "/Users/peurrr/Desktop/sample/env/lib/python3.9/site-packages/websockets/legacy/protocol.py", line 968, in transfer_data
    message = await self.read_message()
  File "/Users/peurrr/Desktop/sample/env/lib/python3.9/site-packages/websockets/legacy/protocol.py", line 1038, in read_message
    frame = await self.read_data_frame(max_size=self.max_size)
  File "/Users/peurrr/Desktop/sample/env/lib/python3.9/site-packages/websockets/legacy/protocol.py", line 1113, in read_data_frame
    frame = await self.read_frame(max_size)
  File "/Users/peurrr/Desktop/sample/env/lib/python3.9/site-packages/websockets/legacy/protocol.py", line 1170, in read_frame
    frame = await Frame.read(
  File "/Users/peurrr/Desktop/sample/env/lib/python3.9/site-packages/websockets/legacy/framing.py", line 69, in read
    data = await reader(2)
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/asyncio/streams.py", line 721, in readexactly
    raise exceptions.IncompleteReadError(incomplete, n)
asyncio.exceptions.IncompleteReadError: 0 bytes read on a total of 2 expected bytes

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/peurrr/Desktop/sample/env/lib/python3.9/site-packages/pyppeteer/connection.py", line 73, in _async_send
    await self.connection.send(msg)
  File "/Users/peurrr/Desktop/sample/env/lib/python3.9/site-packages/websockets/legacy/protocol.py", line 635, in send
    await self.ensure_open()
  File "/Users/peurrr/Desktop/sample/env/lib/python3.9/site-packages/websockets/legacy/protocol.py", line 944, in ensure_open
    raise self.connection_closed_exc()
websockets.exceptions.ConnectionClosedError: no close frame received or sent

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/peurrr/Desktop/sample/env/lib/python3.9/site-packages/pyppeteer/connection.py", line 79, in _async_send
    await self.dispose()
  File "/Users/peurrr/Desktop/sample/env/lib/python3.9/site-packages/pyppeteer/connection.py", line 170, in dispose
    await self._on_close()
  File "/Users/peurrr/Desktop/sample/env/lib/python3.9/site-packages/pyppeteer/connection.py", line 151, in _on_close
    cb.set_exception(_rewriteError(
asyncio.exceptions.InvalidStateError: invalid state

[ajatkj]

Seems like Chromium is crashing because pyppeteer uses a very old version of Chromium by default. Try installing latest version of Chromium by setting PYPPETEER_CHROMIUM_REVISION to the latest revision.
You can find the latest revision from here.

I can run below code without any issues (I am on latest version of Chromium browser).

import asyncio

from pyppeteer import launch


async def main():
    browser = await launch(headless=False)
    page = await browser.newPage()
    # Do your thing
    await browser.close()


asyncio.run(main())

[G-Guillard]

I had the same issue (actually, the readme example would trigger an infinite loop without error message, the browser acting as if it had no internet connection).

@ajatkj's answer seems spot on, since it worked fine after

$ export PYPPETEER_CHROMIUM_REVISION=1149569
$ pyppeteer-install

However I noticed afterwards the somehow discreet warning on top of the readme :

Attention: This repo is unmaintained and has been outside of minor changes for a long time. Please consider playwright-python as an alternative.

It might be worth considering.

[cboin1996]

I made a fork that uses playwright under the hood. see: https://github.com/cboin1996/requests-html