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1- 我正在尝试订阅特定频道并从一台服务器进行长轮询,但我收到客户端未知错误 402。以前有人遇到过这个问题吗?代码中缺少什么?

import asyncio
from aiocometd import Client
import aiocometd.exceptions as cometd_exc
from aiocometd import Client, ConnectionType

IP= "x.x.x.x"

#Handshaking
async def main():

    async with Client("http://"+IP+":8081/events/server/cometd",connection_timeout=60 , connection_types=ConnectionType.LONG_POLLING) as client:

            await client.subscribe("/events/rest/alarmEvent")

            async for message in client:
                print(message)
    try:
        message = await client.receive()
    except TransportTimeoutError:
        print("Connection is lost with the server. "
              "Couldn't reconnect in 60 seconds.")

if __name__ == "__main__":
    loop = asyncio.get_event_loop()
    loop.run_until_complete(main())


'Error code 402 //Unknown Client'
        
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