[BUG] asyncio.exceptions.CancelledError -

[agrawalsmart7]

This is my small code that submits the login form of the localhost environment but when I run this program I am receiving the exception. I have no idea why i am receiving these kinds of errors. Can anyone please check it from your end?

def login_identifier():
    request_monitor= []
    with sync_playwright() as playwright:
        browser = playwright.chromium.launch(headless=False)
        page = browser.new_page()
        page.on('request', lambda request: request_monitor.append({request.method:[request.url, request.post_data, request.header_value("Content-type")]}))

        print("Browsing -> ", "https://localhost/")
        page.goto("https://localhost/")
        page.locator('input[name="login"]').fill('test@test.com')
        page.locator('input[name="password"]').fill('Test12!@')
        page.locator('div[id="signIn"]').click()
        print("Successfully Submitted the form")
        
        browser.close()
        print("Login Identifier Complete")
        print(request_monitor, "aaaaa")
        

Exceptions I am getting is -

Exception in callback SyncBase._sync.<locals>.<lambda>(<Task cancell...twork.py:231>>) at C:\python\lib\site-packages\playwright\_impl\_sync_base.py:100
handle: <Handle SyncBase._sync.<locals>.<lambda>(<Task cancell...twork.py:231>>) at C:\python\lib\site-packages\playwright\_impl\_sync_base.py:100>
Traceback (most recent call last):
  File "C:\python\lib\site-packages\playwright\_impl\_network.py", line 232, in header_value
    return (await self._actual_headers()).get(name)
  File "C:\python\lib\site-packages\playwright\_impl\_network.py", line 240, in _actual_headers
    headers = await self._channel.send("rawRequestHeaders")
  File "C:\python\lib\site-packages\playwright\_impl\_connection.py", line 44, in send
    return await self._connection.wrap_api_call(
  File "C:\python\lib\site-packages\playwright\_impl\_connection.py", line 419, in wrap_api_call
    return await cb()
  File "C:\python\lib\site-packages\playwright\_impl\_connection.py", line 70, in inner_send
    done, _ = await asyncio.wait(
  File "C:\python\lib\asyncio\tasks.py", line 413, in wait
    return await _wait(fs, timeout, return_when, loop)
  File "C:\python\lib\asyncio\tasks.py", line 525, in _wait
    await waiter
asyncio.exceptions.CancelledError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\python\lib\asyncio\events.py", line 80, in _run
    self._context.run(self._callback, *self._args)
  File "C:\python\lib\site-packages\playwright\_impl\_sync_base.py", line 100, in <lambda>
    task.add_done_callback(lambda _: g_self.switch())
  File "C:\python\lib\site-packages\playwright\_impl\_browser_context.py", line 132, in <lambda>
    lambda params: self._on_request(
  File "C:\python\lib\site-packages\playwright\_impl\_browser_context.py", line 483, in _on_request
    page.emit(Page.Events.Request, request)
  File "C:\python\lib\site-packages\pyee\base.py", line 176, in emit
    handled = self._call_handlers(event, args, kwargs)
  File "C:\python\lib\site-packages\pyee\base.py", line 154, in _call_handlers
    self._emit_run(f, args, kwargs)
  File "C:\python\lib\site-packages\pyee\asyncio.py", line 48, in _emit_run
    coro: Any = f(*args, **kwargs)
  File "C:\python\lib\site-packages\playwright\_impl\_impl_to_api_mapping.py", line 123, in wrapper_func
    return handler(
  File "C:\Users\shubh\testing\authbypass\case3\python3_scripts\tests\route3.py", line 47, in <lambda>
    page.on('request', lambda request: request_monitor.append({request.method:[request.url, request.post_data, request.header_value("Content-type")]}))
  File "C:\python\lib\site-packages\playwright\sync_api\_generated.py", line 382, in header_value
    self._sync(self._impl_obj.header_value(name=name))
  File "C:\python\lib\site-packages\playwright\_impl\_sync_base.py", line 104, in _sync
    return task.result()
asyncio.exceptions.CancelledError
Exception in callback SyncBase._sync.<locals>.<lambda>(<Task cancell...twork.py:231>>) at C:\python\lib\site-packages\playwright\_impl\_sync_base.py:100
handle: <Handle SyncBase._sync.<locals>.<lambda>(<Task cancell...twork.py:231>>) at C:\python\lib\site-packages\playwright\_impl\_sync_base.py:100>
Traceback (most recent call last):
  File "C:\python\lib\site-packages\playwright\_impl\_network.py", line 232, in header_value
    return (await self._actual_headers()).get(name)
  File "C:\python\lib\site-packages\playwright\_impl\_network.py", line 240, in _actual_headers
    headers = await self._channel.send("rawRequestHeaders")
  File "C:\python\lib\site-packages\playwright\_impl\_connection.py", line 44, in send
    return await self._connection.wrap_api_call(
  File "C:\python\lib\site-packages\playwright\_impl\_connection.py", line 419, in wrap_api_call
    return await cb()
  File "C:\python\lib\site-packages\playwright\_impl\_connection.py", line 70, in inner_send
    done, _ = await asyncio.wait(
  File "C:\python\lib\asyncio\tasks.py", line 413, in wait
    return await _wait(fs, timeout, return_when, loop)
  File "C:\python\lib\asyncio\tasks.py", line 525, in _wait
    await waiter
asyncio.exceptions.CancelledError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\python\lib\asyncio\events.py", line 80, in _run
    self._context.run(self._callback, *self._args)
  File "C:\python\lib\site-packages\playwright\_impl\_sync_base.py", line 100, in <lambda>
    task.add_done_callback(lambda _: g_self.switch())
  File "C:\python\lib\site-packages\playwright\_impl\_browser_context.py", line 132, in <lambda>
    lambda params: self._on_request(
  File "C:\python\lib\site-packages\playwright\_impl\_browser_context.py", line 483, in _on_request
    page.emit(Page.Events.Request, request)
  File "C:\python\lib\site-packages\pyee\base.py", line 176, in emit
    handled = self._call_handlers(event, args, kwargs)
  File "C:\python\lib\site-packages\pyee\base.py", line 154, in _call_handlers
    self._emit_run(f, args, kwargs)
  File "C:\python\lib\site-packages\pyee\asyncio.py", line 48, in _emit_run
    coro: Any = f(*args, **kwargs)
  File "C:\python\lib\site-packages\playwright\_impl\_impl_to_api_mapping.py", line 123, in wrapper_func
    return handler(
  File "C:\Users\shubh\testing\authbypass\case3\python3_scripts\tests\route3.py", line 47, in <lambda>
    page.on('request', lambda request: request_monitor.append({request.method:[request.url, request.post_data, request.header_value("Content-type")]}))
  File "C:\python\lib\site-packages\playwright\sync_api\_generated.py", line 382, in header_value
    self._sync(self._impl_obj.header_value(name=name))
  File "C:\python\lib\site-packages\playwright\_impl\_sync_base.py", line 104, in _sync
    return task.result()
asyncio.exceptions.CancelledError

Can anyone show me a way to come out from this?

[mxschmitt]

Looks like you are calling methods on the request after with sync_playwright() as playwright: is done and the browser/page is closed. That does not work, you need to process them before closing the page.

[agrawalsmart7]

@mxchmitt, Can you help me in modifying the code? What can I change ?

[agrawalsmart7]

Resolved! I just changed with loop to this

playwright = sync_playwright().start()

And I used time.sleep(3) before closing the browser

[agrawalsmart7]

Ohkay one more new error -

When I use the above solution I am getting this new error

Traceback (most recent call last):
  File "C:\Users\shubh\testing\authbypass\case3\python3_scripts\tests\route3.py", line 108, in <module>
    proxy_requests()
  File "C:\Users\shubh\testing\authbypass\case3\python3_scripts\tests\route3.py", line 71, in proxy_requests
    playwright = sync_playwright().start()
  File "C:\python\lib\site-packages\playwright\sync_api\_context_manager.py", line 95, in start
    return self.__enter__()
  File "C:\python\lib\site-packages\playwright\sync_api\_context_manager.py", line 44, in __enter__
    raise Error(
playwright._impl._api_types.Error: It looks like you are using Playwright Sync API inside the asyncio loop.
Please use the Async API instead.

[mxschmitt]

Looks like you are creating multiple instances, make sure you call playwright = sync_playwright().start() only a single time.