How to listen to WebSocketConnectionClosedException to handle signalr server down?

[ngunhaSO]

Anyone can recommend a best way to handle this exception "websocket._exceptions.WebSocketConnectionClosedException"? I am trying to use this in my django app, everything is fine but as long as the vendor shutdown the signalr, my django just throws out a bunch of exception with web socket connection closed.
The other thing is that, these exceptions even throws without being trigger from my django.

Here is the log:

2018-11-07T08:53:03Z <Greenlet "Greenlet-0" at 0x1105bed48: wrapped_listener> failed with WebSocketConnectionClosedException

Traceback (most recent call last):
File "src/gevent/greenlet.py", line 716, in gevent._greenlet.Greenlet.run
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/signalr/_connection.py", line 53, in wrapped_listener
listener()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/signalr/transports/_ws_transport.py", line 42, in _receive
for notification in self.ws:
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/websocket/_core.py", line 109, in iter
yield self.recv()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/websocket/_core.py", line 302, in recv
opcode, data = self.recv_data()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/websocket/_core.py", line 319, in recv_data
opcode, frame = self.recv_data_frame(control_frame)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/websocket/_core.py", line 332, in recv_data_frame
frame = self.recv_frame()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/websocket/_core.py", line 366, in recv_frame
return self.frame_buffer.recv_frame()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/websocket/_abnf.py", line 361, in recv_frame
self.recv_header()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/websocket/_abnf.py", line 309, in recv_header
header = self.recv_strict(2)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/websocket/abnf.py", line 396, in recv_strict
bytes = self.recv(min(16384, shortage))
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/websocket/_core.py", line 441, in _recv
return recv(self.sock, bufsize)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/websocket/_socket.py", line 94, in recv
"Connection is already closed.")
websocket._exceptions.WebSocketConnectionClosedException: Connection is already closed.