Recent apache2 upgrade has exposed an error in mailman3 Apache config

Details are in the Mailman mailing list here:

https://<email address hidden>/thread/JSLTGUQDWRGQTOZWUKIOSDJLJSDYMSUC/

But since the Apache2 security fix of 28th September 2021, Mailman3's web interface produces a lot of 404 errors. The fix is to remove the trailing / from the ProxyPass rule, so:

ProxyPass /mailman3 unix:/run/mailman3-web/uwsgi.sock|uwsgi://localhost/

becomes

ProxyPass /mailman3 unix:/run/mailman3-web/uwsgi.sock|uwsgi://localhost

I confess I don't know why this fixes it, but it does. I also tried that config with the old version of apache2 from before the security fix, and it still works, so I don't think it introduces a regression.

Regards,

Tim