The original commit that produced the following error:

Exception in thread Thread-1:
Traceback (most recent call last):
File “/home/chris/ankidev/out/extracted/python/lib/python3.9/threading.py”, line 980, in _bootstrap_inner
self.run()
File “/home/chris/ankidev/qt/aqt/mediasrv.py”, line 93, in run

DevTools listening on ws://127.0.0.1:8080/devtools/browser/27d471d5-c7a4-4890-aa4a-3e6d790323b1
% (self.server.effective_host, self.server.effective_port) # type: ignore
AttributeError: ‘MultiSocketServer’ object has no attribute ‘effective_host

https://github.com/ankitects/anki/commit/d5b5b861e24fccf8248dc9786afa13faea203755

The change that fixed the issue: