Gracefully handle server shutdown on client side?

[Chroma72]

So everything is working fine but when the client is connected to the server and I close the server, I get Uncaught In Promise and ERR CONNECTION REFUSED type errors in the browser console. Is there a right way to handle an unexpected server shutdown on the client side so that the client doesn't go haywire? I've tried no actions, I've tried closing the client channel.close(), nothing is keeping the errors from popping up so far.