Hi, I had a same issue in those days.
Did you try the proxy_cache_lock_timeout?
https://forum.nginx.org/read.php?2,276344,276349#msg-276349
But the below article said if you reduce simply the once busy loop time, it
may not resolve this problem for which based on the nginx event
notification mech
I'm going to try to and create an integration test for it so that I can show
the setup doing the unexpected 500ms locking for stale+1 requests. I can then
set the debug level and if I can't figure it out I will post back here with the
integration tests.
The reason I posted on the devel list was
