Task exception was never retrieved on v3.8.3

Author: w0rmr1d3rCreated Sep 27, 2022Updated Jul 28, 2026

Labelsbug

Describe the bug

We bumped from v3.8.1 to v3.8.3 this morning and started seeing the following errors. No other changes were done to our project:

Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/aiohttp/web_protocol.py", line 505, in start
    request = self._request_factory(message, payload, self, writer, handler)
  File "/usr/local/lib/python3.9/site-packages/aiohttp/web_app.py", line 446, in _make_request
    return _cls(
  File "/usr/local/lib/python3.9/site-packages/aiohttp/web_request.py", line 811, in __init__
    super().__init__(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/aiohttp/web_request.py", line 188, in __init__
    assert transport is not None
AssertionError

And

Task exception was never retrieved
future: <Task finished name='Task-30396' coro=<RequestHandler.start() done, defined at /usr/local/lib/python3.9/site-packages/aiohttp/web_protocol.py:462> exception=AssertionError()>

To Reproduce

We were using v3.8.1
Bump to v3.8.3

No other changes introduced from our side, those errors started appearing.

Expected behavior

For that exception to be handled.

Logs/tracebacks

python-traceback

Added them on the description, adding them here as well:

Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/aiohttp/web_protocol.py", line 505, in start
    request = self._request_factory(message, payload, self, writer, handler)
  File "/usr/local/lib/python3.9/site-packages/aiohttp/web_app.py", line 446, in _make_request
    return _cls(
  File "/usr/local/lib/python3.9/site-packages/aiohttp/web_request.py", line 811, in __init__
    super().__init__(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/aiohttp/web_request.py", line 188, in __init__
    assert transport is not None
AssertionError

And

Task exception was never retrieved
future: <Task finished name='Task-30396' coro=<RequestHandler.start() done, defined at /usr/local/lib/python3.9/site-packages/aiohttp/web_protocol.py:462> exception=AssertionError()>

Python Version

bash

$ python --version
3.9.13

aiohttp Version

bash

$ python -m pip show aiohttp
3.8.3

multidict Version

bash

$ python -m pip show multidict
6.0.2

yarl Version

bash

$ python -m pip show yarl
1.8.1

OS

Docker image

Related component

Server

Additional context

I have added as much context as I had, if I left out anything relevant, happy to look for it and add it to the issue.

Code of Conduct

I agree to follow the aio-libs Code of Conduct

Source: aio-libs/aiohttp

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