File "~~~~.py", line 80, in resolve_url
    await self.ws.send_json(data)
  File "~~~~\Lib\site-packages\httpx_ws\_api.py", line 701, in send_json
    await self.send_text(serialized_data)
  File "~~~~\Lib\site-packages\httpx_ws\_api.py", line 659, in send_text
    await self.send(event)
  File "~~~~\Lib\site-packages\httpx_ws\_api.py", line 638, in send
    await self.stream.write(data)
  File "~~~~\Lib\site-packages\httpcore\backends\asyncio.py", line 51, in write
    await self._stream.send(item=buffer)
  File "~~~~\Lib\site-packages\anyio\_backends\_asyncio.py", line 1291, in send
    with self._send_guard:
  File "~~~~\Lib\site-packages\anyio\_core\_synchronization.py", line 584, in __enter__
    raise BusyResourceError(self.action)
anyio.BusyResourceError: Another task is already writing to this resource

I can't quite trace the conditions for the above error, because it only happens occasionally.