Due to http/2 connection reuse bugs, sometimes firefox will decide to
'reuse' a connection to fedoraproject.org for openqa.fedoraproject.org
(since they both have the same tls cert), but openqa is only available
from the 2 iad2 proxies, not all of them. This results in a 503 timeout
and it just not loading. This should make those reused connections get a
421 from proxies and reconnect to the proper ips. (we hope)
Signed-off-by: Kevin Fenzi <kevin@scrye.com>
