"Connection is already closed." error with python WebSocket client

Question

I've been trying to use the python websocket-client module to receive and store continuous updates from an exchange. Generally, the script will run smoothly for a day or so before raising the following error: websocket._exceptions.WebSocketConnectionClosedException: Connection is already closed.

I've looked at the websocket-client source code and apparently the error is being raised in line 92 by the code if not bytes_:. Furthermore, the WebSocketConnectionClosedException is supposed to be raised "If remote host closed the connection or some network error happened".

Can anybody tell me why this is happening, and what I could do to stop or handle it.

It means that someone closed the connection. Can you just re-establish it? I think you'd need that for resiliency anyway. — tdelaney
– tdelaney, Commented Jan 22, 2017 at 0:16
Did you ever find a solution to this problem? I'm running into the same problem. — sudo
– sudo, Commented Dec 15, 2017 at 18:04
I would like to know how to reproduce this error because this has cost me a lot of money. I think adding a check like: try: ws.close() except: pass finally: self.connect() would work but idk yet — Chev_603
– Chev_603, Commented May 17, 2021 at 3:05

Roland Weber · Accepted Answer · 2019-06-01 18:11:33Z

2

Most likely, the remote host closed the connection. You cannot stop it. You can handle it by re-connecting.

People running web servers will implement automatic cleanup to get rid of potentially stale connections. Closing a connection that's been open for 24 hours sounds like a sensible approach. And there's no harm done, because if the client is still interested, it can re-establish the connection. That's also useful to re-authenticate the client, if authentication is required.

On second thought, it might be a network disconnect as well. Some DSL providers used to disconnect and re-assign a new IP every 24 hours, to prevent users from running permanent services on temporarily assigned IP addresses. Don't know if they still do that.

answered Jun 1, 2019 at 18:11

Roland Weber

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