Context Navigation

Changes between Version 5 and Version 6 of Ticket #31373

-              v5
+              v6
 -  CONN_MAX_AGE = 30, starting `runserver` and making many calls with `ab -c 10 -n 100 http://127.0.0.1:8000/` uses all available connections and ends with error 500 (due to no available connections)
 - CONN_MAX_AGE = 30, starting `runserver --nothreading` and making calls with  `ab -c 100 -n 100 http://127.0.0.1:8000/` works fine
+- CONN_MAX_AGE=30 + runserver + ab scenario is reproducible on clean install. Called view must access database.
+- CONN_MAX_AGE=0 + runserver + ab -> cannot reproduce.
+- Django 2.x has similar issue for CONN_MAX_AGE=30, but can reuse connections (still there are several errors on high traffic, but app server can "recover" and handle bunch of incoming requests)
+- Looks like Django 3.x cannot reuse connections
+CONN_MAX_AGE=30 + runserver + ab scenario is reproducible on clean install. View must call database.
+CONN_MAX_AGE=0 + runserver + ab -> cannot reproduce.
+`ab -c 10 -n 200 ` Django 3.0.4:
+Complete requests:      200
+Failed requests:        108
+`ab -c 10 -n 1000` Django 2.2.11:
+Complete requests:      1000
+Failed requests:        37