[Errno None] Can not write request body for <my_url> with a large number of requests

[DimaKalbfleysh]

Describe the bug

The tracker often receives an error that I have not been able to fix and reproduce for a long time.

This is what my client looks like

class Client:
    _auth = (API_USER, API_PASSWORD)

    def __init__(self):
        self.auth = aiohttp.BasicAuth(self._auth[0], self._auth[1])

    async def send(self, url, json, debug=True,):
        try:
            async with aiohttp.ClientSession(
                    connector=aiohttp.TCPConnector(verify_ssl=False),
                    raise_for_status=True,
            ) as session:
                async with session.post(
                        url=url,
                        json=json,
                        auth=self.auth,
                ) as response:
                    if debug:
                        print(f"{url} response.status", response.status, json)
                    if response.status not in [200, 201]:
                        error = False
                        result = None
                        return error, result

                    error = False
                    result = await response.json(content_type=None)

                    if 'error' in result:
                        if debug:
                            print(f'{url} error', result, json)
                        error = True
                        result = None

                    return error, result
        except (
                aiohttp.client_exceptions.ClientResponseError,
                aiohttp.client_exceptions.ClientConnectorError,
                JSONDecodeError,
                TimeoutError,
        ) as e:
            error = True
            result = None
            return error, result

await Client.send(
    url="my_url",
    json=my_json
)

Please tell me what the problem is

To Reproduce

Do not know how

Expected behavior

Send request normally

Logs/tracebacks

ConnectionResetError: Cannot write to closing transport
  File "aiohttp/client_reqrep.py", line 553, in write_bytes
    await self.body.write(writer)
  File "aiohttp/payload.py", line 231, in write
    await writer.write(self._value)
  File "aiohttp/http_writer.py", line 101, in write
    self._write(chunk)
  File "aiohttp/http_writer.py", line 67, in _write
    raise ConnectionResetError('Cannot write to closing transport')
ClientOSError: [Errno None] Can not write request body for <my_url>
  File "__init__.py", line 1182, in handle_exception_to_resp
    resp = await self.handle_exception(exc)
  File "__init__.py", line 1177, in handle_exception
    raise exc
  File "__init__.py", line 559, in _handle_exception
    yield
  File "__init__.py", line 1091, in handle_req_to_resp
    shared_dependencies_error=shared_dependencies_error,
  File "__init__.py", line 1116, in handle_req
    shared_dependencies_error=shared_dependencies_error,
  File "__init__.py", line 808, in handle_req
    result = await call_sync_async(self.func, **values)
  File "__init__.py", line 332, in call_sync_async
    return await call(*args, **kwargs)
  File "aiohttp/client.py", line 1005, in __aenter__
    self._resp = await self._coro
  File "aiohttp/client.py", line 497, in _request
    await resp.start(conn)
  File "aiohttp/client_reqrep.py", line 844, in start
    message, payload = await self._protocol.read()  # type: ignore  # noqa
  File "aiohttp/streams.py", line 588, in read
    await self._waiter

Python Version

$ python --version
3.7

aiohttp Version

$ python -m pip show aiohttp
3.5.4

multidict Version

$ python -m pip show multidict
4.5.2

yarl Version

$ python -m pip show yarl
1.3.0

OS

Ubuntu Linux 16.04

Related component

Client

Additional context

No response

Code of Conduct

• I agree to follow the aio-libs Code of Conduct

[webknjaz]

There's not enough information. With no reproducer, we'll probably just close this. The exception implies that you're attempting to send some data over a closing connection but since you haven't demonstrated what it is that you do, I can't speculate anymore.

[DimaKalbfleysh]

What information do you need to discard? I do not understand in what cases this error occurs.
ClientOSError: [Errno None] Can not write request body for <my_url>