Session not found when using sio.transport(sid) due to wrong session id

[LostInDarkMath]

Describe the bug
Seems like the sio.transport() method does work as expected.

To Reproduce
Use this connect callback:

import logging
from socketio import AsyncServer
sio: AsyncServer

async def on_connect(session_id: str, environ: dict) -> None:
    other_sid = sio.manager.eio_sid_from_sid(sid=session_id, namespace='/')
    logging.info(f'SocketIO: user {session_id} uses transport {sio.transport(other_sid)}')  # works fine
    logging.info(f'SocketIO: user {session_id} uses transport {sio.transport(session_id)}')  # crashes with KeyError

Expected behavior
I would not expect to translate the sid myself. The library should handle this for me like in sio.save_session().

Logs

2024-01-13 17:58:12,181.181: INFO     SocketIO: user mjMOEbi52VyD5N3wAAAB uses transport websocket
message async handler error
Traceback (most recent call last):
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/venv/lib/python3.11/site-packages/engineio/base_server.py", line 224, in _get_socket
    s = self.sockets[sid]
        ~~~~~~~~~~~~^^^^^
KeyError: 'mjMOEbi52VyD5N3wAAAB'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/venv/lib/python3.11/site-packages/engineio/async_server.py", line 483, in run_async_handler
    return await self.handlers[event](*args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/venv/lib/python3.11/site-packages/socketio/async_server.py", line 669, in _handle_eio_message
    await self._handle_connect(eio_sid, pkt.namespace, pkt.data)
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/venv/lib/python3.11/site-packages/socketio/async_server.py", line 552, in _handle_connect
    success = await self._trigger_event(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/venv/lib/python3.11/site-packages/socketio/async_server.py", line 634, in _trigger_event
    ret = await handler(*args)
          ^^^^^^^^^^^^^^^^^^^^
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/api/mobile_app/socketio/routes.py", line 22, in on_connect
    logging.info(f'SocketIO: user {session_id} uses transport {sio.transport(session_id)}')
                                                               ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/venv/lib/python3.11/site-packages/socketio/base_server.py", line 198, in transport
    return self.eio.transport(sid)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/venv/lib/python3.11/site-packages/engineio/base_server.py", line 157, in transport
    return 'websocket' if self._get_socket(sid).upgraded else 'polling'
                          ^^^^^^^^^^^^^^^^^^^^^
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/venv/lib/python3.11/site-packages/engineio/base_server.py", line 226, in _get_socket
    raise KeyError('Session not found')
KeyError: 'Session not found'
2024-01-13 17:58:12,181.181: ERROR    message async handler error
Traceback (most recent call last):
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/venv/lib/python3.11/site-packages/engineio/base_server.py", line 224, in _get_socket
    s = self.sockets[sid]
        ~~~~~~~~~~~~^^^^^
KeyError: 'mjMOEbi52VyD5N3wAAAB'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/venv/lib/python3.11/site-packages/engineio/async_server.py", line 483, in run_async_handler
    return await self.handlers[event](*args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/venv/lib/python3.11/site-packages/socketio/async_server.py", line 669, in _handle_eio_message
    await self._handle_connect(eio_sid, pkt.namespace, pkt.data)
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/venv/lib/python3.11/site-packages/socketio/async_server.py", line 552, in _handle_connect
    success = await self._trigger_event(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/venv/lib/python3.11/site-packages/socketio/async_server.py", line 634, in _trigger_event
    ret = await handler(*args)
          ^^^^^^^^^^^^^^^^^^^^
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/api/mobile_app/socketio/routes.py", line 22, in on_connect
    logging.info(f'SocketIO: user {session_id} uses transport {sio.transport(session_id)}')
                                                               ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/venv/lib/python3.11/site-packages/socketio/base_server.py", line 198, in transport
    return self.eio.transport(sid)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/venv/lib/python3.11/site-packages/engineio/base_server.py", line 157, in transport
    return 'websocket' if self._get_socket(sid).upgraded else 'polling'
                          ^^^^^^^^^^^^^^^^^^^^^
  File "/home/willi/Documents/repositories/FCM_Python_Flutter_Test/src/backend/venv/lib/python3.11/site-packages/engineio/base_server.py", line 226, in _get_socket
    raise KeyError('Session not found')
KeyError: 'Session not found'

[miguelgrinberg]

Thanks, I will take care of it.