Sometimes the interface reports an error

[zhou1591]

Hello everyone, I would like to ask why I use the official demo startup, sometimes interface request failure situation?

http://127.0.0.1:11218/api/hangup?peerid=0.05140381280769102
http://127.0.0.1:18099/api/hangup?peerid=0.44680305484265115
http://127.0.0.1:18099/api/getIceServers

onError:getIceServers TypeError: Failed to fetch

Then he would give me a mistake, but I just started, as usual, he sometimes does