--prefer-family=ipv4 doesn't work as expected (regression)
Though --prefer-family=ipv4
is given, I see
...
09.152429.461 dequeue job http://localhost:39980/page1.html
09.152429.461 resolving localhost:39980...
09.152429.462 has ::1:39980
09.152429.462 has 127.0.0.1:39980
09.152429.462 trying ::1:39980...
...
This breaks tests on some machines, depending on the order of returned IP addresses.
It also shows that our test suite server doesn't work on ::1.